Fundies. English
Segment disclosures
Company overviewNORTHERN STATES POWER CO /WI/
Each reported dimension combination stays separate. Revenue and operating income are shown as reported, with their dates and sources.
Revenue · Reported segment facts
64 dimension combinations 752 retained observations 55 reported periods Partial retained history
Counts describe retained dimensioned rows only. Periods and members can change across reports, and this view does not infer missing values or expected segment totals.
Operating Segments · Regulated Electric
Consolidation Items · Statement Business Segments
Source dimensions
nspw:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 190889000 | U002 | 20130506 | Open filing evidence |
Operating Segments · Regulated Natural Gas
Consolidation Items · Statement Business Segments
Source dimensions
nspw:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 50665000 | U002 | 20130506 | Open filing evidence |
Operating Segments · All Other Segments
Consolidation Items · Statement Business Segments
Source dimensions
nspw:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 247000 | U002 | 20130506 | Open filing evidence |
Intersegment Elimination · Regulated Electric
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-01-01 – 2019-03-31 | 100000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 400000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 112000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 327000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 100000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 500000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 144000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 363000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 400000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
Intersegment Elimination · Regulated Natural Gas
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-01-01 – 2019-03-31 | 200000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 400000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | -33000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 242000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 100000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 300000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 56000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 238000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 500000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
Intersegment Elimination · All Other Segments
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-01-01 – 2019-03-31 | 0 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 0 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 0 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 0 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 0 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 0 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
Operating Segments · Regulated Electric
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 257000000 | USD | 2026-07-30 · 18:48:37.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 555000000 | USD | 2026-07-30 · 18:48:37.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 298000000 | USD | 2026-04-30 · 20:32:44.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1063000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 291000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 803000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 253000000 | USD | 2026-07-30 · 18:48:37.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 512000000 | USD | 2026-07-30 · 18:48:37.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 259000000 | USD | 2026-04-30 · 20:32:44.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 995000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 278000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 780000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 246000000 | USD | 2025-07-31 · 17:01:28.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 502000000 | USD | 2025-07-31 · 17:01:28.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 256000000 | USD | 2025-04-24 · 17:10:40.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1019000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 263000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 753000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1002000000 | USD | 2025-02-27 · 21:17:50.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 274000000 | USD | 2022-10-27 · 19:04:43.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 767000000 | USD | 2022-10-27 · 19:04:43.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 243000000 | USD | 2022-07-28 · 16:20:54.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 493000000 | USD | 2022-07-28 · 16:20:54.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 250000000 | USD | 2022-04-28 · 17:46:37.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 922000000 | USD | 2024-02-21 · 20:42:15.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 252000000 | USD | 2022-10-27 · 19:04:43.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 700000000 | USD | 2022-10-27 · 19:04:43.000Z | Open filing evidence |
| 2021-04-01 – 2021-06-30 | 224000000 | USD | 2022-07-28 · 16:20:54.000Z | Open filing evidence |
| 2021-01-01 – 2021-06-30 | 448000000 | USD | 2022-07-28 · 16:20:54.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 224000000 | USD | 2022-04-28 · 17:46:37.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 855000000 | USD | 2021-02-17 · 21:06:52.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 236000000 | USD | 2021-10-28 · 19:28:29.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 647000000 | USD | 2021-10-28 · 19:28:29.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 199300000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 411100000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 212000000 Restated | USD | 2021-04-29 · 18:00:56.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 845000000 Restated | USD | 2021-02-17 · 21:06:52.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 229000000 | USD | 2019-10-25 · 16:38:00.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 651900000 | USD | 2019-10-25 · 16:38:00.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 207900000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 422900000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 215000000 | USD | 2020-05-07 · 18:48:26.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 879000000 Restated | USD | 2021-02-17 · 21:06:52.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 240300000 Restated | USD | 2019-10-25 · 16:38:00.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 666200000 Restated | USD | 2019-10-25 · 16:38:00.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 209500000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 425900000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 216300000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 881900000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 232802000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 659853000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 849900000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
Operating Segments · Regulated Natural Gas
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 25000000 | USD | 2026-07-30 · 18:48:37.000Z | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 108000000 | USD | 2026-07-30 · 18:48:37.000Z | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 83000000 | USD | 2026-04-30 · 20:32:44.000Z | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 160000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 18000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 110000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 24000000 | USD | 2026-07-30 · 18:48:37.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 92000000 | USD | 2026-07-30 · 18:48:37.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 68000000 | USD | 2026-04-30 · 20:32:44.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 135000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 17000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 92000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 21000000 | USD | 2025-07-31 · 17:01:28.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 75000000 | USD | 2025-07-31 · 17:01:28.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 54000000 | USD | 2025-04-24 · 17:10:40.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 157000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 15000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 116000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 77000000 | USD | 2023-04-27 · 19:57:20.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 198000000 | USD | 2025-02-27 · 21:17:50.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 20000000 | USD | 2022-10-27 · 19:04:43.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 133000000 | USD | 2022-10-27 · 19:04:43.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 35000000 | USD | 2022-07-28 · 16:20:54.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 113000000 | USD | 2022-07-28 · 16:20:54.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 78000000 | USD | 2023-04-27 · 19:57:20.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 182000000 | USD | 2024-02-21 · 20:42:15.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 22000000 | USD | 2022-10-27 · 19:04:43.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 110000000 | USD | 2022-10-27 · 19:04:43.000Z | Open filing evidence |
| 2021-04-01 – 2021-06-30 | 31000000 | USD | 2022-07-28 · 16:20:54.000Z | Open filing evidence |
| 2021-01-01 – 2021-06-30 | 88000000 | USD | 2022-07-28 · 16:20:54.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 57000000 | USD | 2022-04-28 · 17:46:37.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 119000000 | USD | 2022-02-23 · 20:40:39.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 14500000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 78700000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 19000000 | USD | 2021-07-29 · 18:11:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 64000000 Restated | USD | 2021-07-29 · 18:11:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 45200000 | USD | 2020-05-07 · 18:48:26.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 136000000 Restated | USD | 2022-02-23 · 20:40:39.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 14600000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 96600000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 20900000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 82000000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 61100000 | USD | 2020-05-07 · 18:48:26.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 142000000 Restated | USD | 2021-02-17 · 21:06:52.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 15400000 Restated | USD | 2019-10-25 · 16:38:00.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 93800000 Restated | USD | 2019-10-25 · 16:38:00.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 22000000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 78500000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 56500000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 122400000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 14394000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 81768000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 106200000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
Operating Segments · All Other Segments
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 1000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1000000 | USD | 2026-02-25 · 22:03:49.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1000000 | USD | 2025-02-27 · 21:17:50.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 1000000 | USD | 2024-02-21 · 20:42:15.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 100000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 300000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 200000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 200000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 0 | USD | 2020-05-07 · 18:48:26.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 400000 | USD | 2020-02-21 · 21:04:32.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 100000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 300000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2019-04-01 – 2019-06-30 | 100000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 200000 | USD | 2020-07-31 · 17:12:44.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 100000 | USD | 2020-05-07 · 18:48:26.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 1000000 Restated | USD | 2021-02-17 · 21:06:52.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 300000 Restated | USD | 2019-10-25 · 16:38:00.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 900000 Restated | USD | 2019-10-25 · 16:38:00.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 300000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 500000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 300000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 315000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 847000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
Commercialand Industrial Customers · Retail Distribution · All Other Segments
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=nspw:CommercialandIndustrialCustomersMember;srt:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 0 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
Commercialand Industrial Customers · All Other Segments · Retail Distribution
Major Customers · Statement Business Segments · Product Or Service
Source dimensions
srt:MajorCustomersAxis=nspw:CommercialandIndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:ProductOrServiceAxis=nspw:RetailDistributionMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
Other Customers · Retail Distribution · All Other Segments
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=nspw:OtherCustomersMember;srt:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 1000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
Other Customers · Regulated Natural Gas · Retail Distribution
Major Customers · Statement Business Segments · Product Or Service
Source dimensions
srt:MajorCustomersAxis=nspw:OtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember;srt:ProductOrServiceAxis=nspw:RetailDistributionMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
Other Customers · All Other Segments · Retail Distribution
Major Customers · Statement Business Segments · Product Or Service
Source dimensions
srt:MajorCustomersAxis=nspw:OtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:ProductOrServiceAxis=nspw:RetailDistributionMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
Residential Customers · Retail Distribution · All Other Segments
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=nspw:ResidentialCustomersMember;srt:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 0 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
Residential Customers · All Other Segments · Retail Distribution
Major Customers · Statement Business Segments · Product Or Service
Source dimensions
srt:MajorCustomersAxis=nspw:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:ProductOrServiceAxis=nspw:RetailDistributionMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
Other Customer · All Other Segments
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=us-gaap:OtherCustomerMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
Alternativeand Other · Regulated Electric
Product Or Service · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=nspw:AlternativeandOtherMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-04-01 – 2019-06-30 | 3000000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 6000000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 3000000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 11500000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 2808000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 8659000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 2900000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 5900000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 2900000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 2880000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 8822000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
Alternativeand Other · Regulated Natural Gas
Product Or Service · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=nspw:AlternativeandOtherMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-04-01 – 2019-06-30 | 600000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 1200000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 600000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 2400000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 576000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 1786000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 600000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 1200000 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 600000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 514000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 1592000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
Alternativeand Other · All Other Segments
Product Or Service · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=nspw:AlternativeandOtherMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-04-01 – 2019-06-30 | 0 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2019-01-01 – 2019-06-30 | 0 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2019-01-01 – 2019-03-31 | 0 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 0 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 0 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 0 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 0 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 0 | USD | 2019-08-01 · 20:51:47.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 0 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 0 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 0 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
Interchange · All Other Segments
Product Or Service · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=nspw:InterchangeMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-07-01 – 2025-09-30 | 0 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 0 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
Retail Distribution · Commercialand Industrial Customers · All Other Segments
Product Or Service · Major Customers · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=nspw:RetailDistributionMember;srt:MajorCustomersAxis=nspw:CommercialandIndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-07-01 – 2025-09-30 | 0 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
Retail Distribution · Residential Customers · All Other Segments
Product Or Service · Major Customers · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=nspw:RetailDistributionMember;srt:MajorCustomersAxis=nspw:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-07-01 – 2025-09-30 | 0 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
Retail Distribution · All Other Segments
Product Or Service · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
Retail Distribution · All Other Segments · Commercialand Industrial Customers
Product Or Service · Statement Business Segments · Major Customers
Source dimensions
srt:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:MajorCustomersAxis=nspw:CommercialandIndustrialCustomersMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
Retail Distribution · All Other Segments · Other Customers
Product Or Service · Statement Business Segments · Major Customers
Source dimensions
srt:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:MajorCustomersAxis=nspw:OtherCustomersMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 1000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
Retail Distribution · All Other Segments · Residential Customers
Product Or Service · Statement Business Segments · Major Customers
Source dimensions
srt:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:MajorCustomersAxis=nspw:ResidentialCustomersMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
Product · All Other Segments
Product Or Service · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=us-gaap:ProductMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2025-10-30 · 18:16:31.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1000000 | USD | 2024-10-31 · 19:13:29.000Z | Open filing evidence |
Intersegment Elimination · Regulated Electric
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 106000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 215000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 109000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 497000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 144000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 363000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 123000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 219000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 96000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 397000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 110000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 317000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 98000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 207000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 109000 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 419000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 101000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 308000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 98000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 207000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 109000 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 497000 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 93000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 308000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 123000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 215000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 92000 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 350000 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 89000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 250000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 83000 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 161000 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 78000 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
Intersegment Elimination · Regulated Natural Gas
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 127000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 275000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 148000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 287000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 56000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 238000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 68000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 182000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 114000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 487000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 97000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 299000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 122000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 202000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 80000 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 498000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 177000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 475000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 73000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 298000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 225000 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 4885000 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 425000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 4191000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 849000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 3766000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 2917000 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 1967000 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 962000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 1549000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 278000 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 586000 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 308000 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
Intersegment Elimination · All Other Segments
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 0 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 0 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 0 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 0 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 0 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 0 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 0 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 0 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 0 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 0 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 0 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 0 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 0 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 0 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 0 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 0 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 0 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 0 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 0 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 0 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 0 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 0 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 0 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 0 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 0 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 0 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 0 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
Operating Segments · Regulated Electric
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 209502000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 425868000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 216366000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 881891000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 232802000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 659853000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 210742000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 427051000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 216309000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 849946000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 232216000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 646619000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 202879000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 414403000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 211524000 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 834998000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 224666000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 634571000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 199621000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 409905000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 210284000 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 829748000 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 216289000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 625663000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 198277000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 409374000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 211097000 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 789168000 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 216545000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 592730000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 185374000 Restated | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 376185000 Restated | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 190811000 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
Operating Segments · Regulated Natural Gas
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 21981000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 78481000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 56500000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 122353000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 14394000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 81768000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 19027000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 67374000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 48347000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 106157000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 13646000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 72671000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 16005000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 59025000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 43020000 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 120147000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 11088000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 91273000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 16889000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 80185000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 63296000 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 169629000 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 14484000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 117814000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 29539000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 103330000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 73791000 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 132867000 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 14266000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 89178000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 24555000 Restated | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 74912000 Restated | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 50357000 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
Operating Segments · All Other Segments
Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 271000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 549000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 278000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 1207000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 315000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 847000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 257000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 532000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 275000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 1130000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 282000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 877000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 289000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 595000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 306000 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 1396000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 407000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 1090000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 303000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 683000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 380000 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 1085000 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 273000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 825000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 298000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 552000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 254000 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 1003000 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 249000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 742000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 246000 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 493000 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 247000 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
Commercialand Industrial Customers · Retail Distribution · Regulated Electric
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:CommercialandIndustrialCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 106367000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 211184000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 104817000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 107899000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 210279000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 102380000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Commercialand Industrial Customers · Retail Distribution · Regulated Natural Gas
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:CommercialandIndustrialCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 9407000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 33957000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 24550000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 8577000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 28835000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 20258000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Commercialand Industrial Customers · Retail Distribution · All Other Segments
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:CommercialandIndustrialCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 25000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 50000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 25000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 27000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 51000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 24000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Other Customers · Retail Distribution · Regulated Electric
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:OtherCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 1782000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 3388000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 1606000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 1678000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 3198000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 1520000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Other Customers · Retail Distribution · Regulated Natural Gas
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:OtherCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Other Customers · Retail Distribution · All Other Segments
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:OtherCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 236000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 473000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 237000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 230000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 461000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 231000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Residential Customers · Retail Distribution · Regulated Electric
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:ResidentialCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 58734000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 126537000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 67803000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 54754000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 120797000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 66043000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Residential Customers · Retail Distribution · Regulated Natural Gas
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:ResidentialCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 10912000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 41238000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 30326000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 9015000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 35643000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 26628000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Residential Customers · Retail Distribution · All Other Segments
Major Customers · Product Or Service · Statement Business Segments
Source dimensions
us-gaap:MajorCustomersAxis=nspw:ResidentialCustomersMember;us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 10000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 26000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 16000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 20000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 20000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Interchange · Regulated Electric
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:InterchangeMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 38370000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 76044000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 37674000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 42965000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 85343000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 42378000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Interchange · Regulated Natural Gas
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:InterchangeMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Interchange · All Other Segments
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:InterchangeMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Other Services · Regulated Electric
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:OtherServicesMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 1360000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 2864000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 1504000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 523000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 1492000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 969000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Other Services · Regulated Natural Gas
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:OtherServicesMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 1069000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 2076000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 1007000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 910000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 1818000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 908000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Other Services · All Other Segments
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:OtherServicesMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 0 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 0 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Retail Distribution · Regulated Electric
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 166883000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 341109000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 174226000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 164331000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 334274000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 169943000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Retail Distribution · Regulated Natural Gas
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 20319000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 75195000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 54876000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 17592000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 64478000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 46886000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Retail Distribution · All Other Segments
Product Or Service · Statement Business Segments
Source dimensions
us-gaap:ProductOrServiceAxis=nspw:RetailDistributionMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2018-04-01 – 2018-06-30 | 271000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 549000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 278000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 257000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 532000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 275000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
Regulated Electric
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-01-01 – 2019-03-31 | 215100000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 879000000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 240456000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 666539000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 209608000 Restated | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 426083000 Restated | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 216400000 Restated | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 882400000 Restated | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 232946000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 660216000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 210865000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 427270000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 216405000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 850300000 Restated | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 232326000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 646936000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 202977000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 414610000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 211633000 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 835417000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 224767000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 634879000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 199719000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 410112000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 210393000 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 830245000 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 216382000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 625971000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 198400000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 409589000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 211189000 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 789518000 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 216634000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 592980000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 185457000 Restated | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 376346000 Restated | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 190811000 | U002 | 20130506 | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 190889000 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
Regulated Electric · Intersegment Elimination
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember;nspw:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 78000 | U002 | 20130506 | Open filing evidence |
Regulated Electric · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedElectricMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 330000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 885000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 291000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 803000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 246000000 | USD | 2024-08-01 · 19:43:09.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 502000000 | USD | 2024-08-01 · 19:43:09.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 256000000 | USD | 2024-04-25 · 16:18:15.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 263000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 753000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 236000000 | USD | 2024-08-01 · 19:43:09.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 490000000 | USD | 2024-08-01 · 19:43:09.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 254000000 | USD | 2024-04-25 · 16:18:15.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1002000000 | USD | 2023-02-23 · 19:57:18.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 274000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 767000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 243000000 | USD | 2023-07-27 · 20:07:05.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 493000000 | USD | 2023-07-27 · 20:07:05.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 250000000 | USD | 2023-04-27 · 19:57:20.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 922000000 | USD | 2023-02-23 · 19:57:18.000Z | Open filing evidence |
| 2021-04-01 – 2021-06-30 | 224000000 | USD | 2021-07-29 · 18:11:18.000Z | Open filing evidence |
| 2021-01-01 – 2021-06-30 | 448000000 | USD | 2021-07-29 · 18:11:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 855000000 | USD | 2023-02-23 · 19:57:18.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 235900000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 647100000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2020-04-01 – 2020-06-30 | 199000000 | USD | 2021-07-29 · 18:11:18.000Z | Open filing evidence |
| 2020-01-01 – 2020-06-30 | 411000000 | USD | 2021-07-29 · 18:11:18.000Z | Open filing evidence |
| 2019-01-01 – 2019-12-31 | 845000000 | USD | 2022-02-23 · 20:40:39.000Z | Open filing evidence |
| 2019-07-01 – 2019-09-30 | 229000000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
| 2019-01-01 – 2019-09-30 | 651900000 | USD | 2020-10-29 · 17:52:43.000Z | Open filing evidence |
Regulated Natural Gas
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-01-01 – 2019-03-31 | 61300000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 142000000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 15322000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 94078000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 22108000 Restated | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 78756000 Restated | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 56600000 Restated | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 122700000 Restated | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 14450000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 82006000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 19095000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 67556000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 48461000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 106700000 Restated | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 13743000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 72970000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 16127000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 59227000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 43100000 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 120645000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 11265000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 91748000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 16962000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 80483000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 63521000 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 174514000 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 14909000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 122005000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 30388000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 107096000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 76708000 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 134834000 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 15228000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 90727000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 24833000 Restated | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 75498000 Restated | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 50357000 | U002 | 20130506 | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 50665000 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
Regulated Natural Gas · Intersegment Elimination
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember;nspw:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 308000 | U002 | 20130506 | Open filing evidence |
Regulated Natural Gas · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=nspw:RegulatedNaturalGasMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 19000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 127000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 18000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 110000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 21000000 | USD | 2024-08-01 · 19:43:09.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 75000000 | USD | 2024-08-01 · 19:43:09.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 54000000 | USD | 2024-04-25 · 16:18:15.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 15000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 116000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 24000000 | USD | 2024-08-01 · 19:43:09.000Z | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 101000000 | USD | 2024-08-01 · 19:43:09.000Z | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 77000000 | USD | 2024-04-25 · 16:18:15.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 198000000 | USD | 2023-02-23 · 19:57:18.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 20000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 133000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 35000000 | USD | 2023-07-27 · 20:07:05.000Z | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 113000000 | USD | 2023-07-27 · 20:07:05.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 182000000 | USD | 2023-02-23 · 19:57:18.000Z | Open filing evidence |
| 2021-07-01 – 2021-09-30 | 22000000 | USD | 2021-10-28 · 19:28:29.000Z | Open filing evidence |
| 2021-01-01 – 2021-09-30 | 110000000 | USD | 2021-10-28 · 19:28:29.000Z | Open filing evidence |
| 2021-01-01 – 2021-03-31 | 57000000 | USD | 2021-04-29 · 18:00:56.000Z | Open filing evidence |
| 2020-01-01 – 2020-12-31 | 119000000 | USD | 2023-02-23 · 19:57:18.000Z | Open filing evidence |
| 2020-07-01 – 2020-09-30 | 15000000 | USD | 2021-10-28 · 19:28:29.000Z | Open filing evidence |
| 2020-01-01 – 2020-09-30 | 79000000 | USD | 2021-10-28 · 19:28:29.000Z | Open filing evidence |
| 2020-01-01 – 2020-03-31 | 45000000 | USD | 2021-04-29 · 18:00:56.000Z | Open filing evidence |
All Other Segments
Statement Business Segments
Multiple units reported for the same period; values are kept separate.
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2019-01-01 – 2019-03-31 | 100000 | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2018-01-01 – 2018-12-31 | 1300000 | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2018-07-01 – 2018-09-30 | 298000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-01-01 – 2018-09-30 | 847000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2018-04-01 – 2018-06-30 | 271000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-06-30 | 549000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2018-01-01 – 2018-03-31 | 300000 Restated | USD | 2019-04-26 · 20:44:11.000Z | Open filing evidence |
| 2017-01-01 – 2017-12-31 | 1200000 Restated | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2017-07-01 – 2017-09-30 | 315000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-01-01 – 2017-09-30 | 847000 | USD | 2018-10-26 · 20:40:31.000Z | Open filing evidence |
| 2017-04-01 – 2017-06-30 | 257000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-06-30 | 532000 | USD | 2018-07-27 · 19:51:18.000Z | Open filing evidence |
| 2017-01-01 – 2017-03-31 | 275000 | USD | 2018-04-27 · 17:31:29.000Z | Open filing evidence |
| 2016-01-01 – 2016-12-31 | 1100000 Restated | USD | 2019-02-22 · 19:36:17.000Z | Open filing evidence |
| 2016-07-01 – 2016-09-30 | 282000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-01-01 – 2016-09-30 | 877000 | USD | 2017-10-27 · 19:42:37.000Z | Open filing evidence |
| 2016-04-01 – 2016-06-30 | 289000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-06-30 | 595000 | USD | 2017-07-28 · 19:17:39.000Z | Open filing evidence |
| 2016-01-01 – 2016-03-31 | 306000 | USD | 2017-04-28 · 20:07:25.000Z | Open filing evidence |
| 2015-01-01 – 2015-12-31 | 1396000 | USD | 2018-07-27 · 18:50:04.000Z | Open filing evidence |
| 2015-07-01 – 2015-09-30 | 407000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-01-01 – 2015-09-30 | 1090000 | USD | 2016-10-31 · 14:37:51.000Z | Open filing evidence |
| 2015-04-01 – 2015-06-30 | 303000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-06-30 | 683000 | USD | 2016-08-04 · 20:04:08.000Z | Open filing evidence |
| 2015-01-01 – 2015-03-31 | 380000 | USD | 2016-05-13 · 18:02:18.000Z | Open filing evidence |
| 2014-01-01 – 2014-12-31 | 1085000 | USD | 2017-02-24 · 19:55:30.000Z | Open filing evidence |
| 2014-07-01 – 2014-09-30 | 273000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-01-01 – 2014-09-30 | 825000 | USD | 2015-11-02 · 20:13:57.000Z | Open filing evidence |
| 2014-04-01 – 2014-06-30 | 298000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-06-30 | 552000 | USD | 2015-08-03 · 13:22:55.000Z | Open filing evidence |
| 2014-01-01 – 2014-03-31 | 254000 | USD | 2015-05-04 · 20:18:49.000Z | Open filing evidence |
| 2013-01-01 – 2013-12-31 | 1003000 | USD | 2016-02-22 · 20:12:13.000Z | Open filing evidence |
| 2013-07-01 – 2013-09-30 | 249000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-01-01 – 2013-09-30 | 742000 | USD | 2014-11-03 · 21:23:01.000Z | Open filing evidence |
| 2013-04-01 – 2013-06-30 | 246000 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-06-30 | 493000 | USD | 2014-08-04 · 20:08:26.000Z | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 247000 | U002 | 20130506 | Open filing evidence |
| 2013-01-01 – 2013-03-31 | 247000 | USD | 2014-05-05 · 20:13:41.000Z | Open filing evidence |
All Other Segments · Intersegment Elimination
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;nspw:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2013-01-01 – 2013-03-31 | 0 | U002 | 20130506 | Open filing evidence |
All Other Segments · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1000000 | USD | 2023-02-23 · 19:57:18.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2021-01-01 – 2021-12-31 | 1000000 | USD | 2022-02-23 · 20:40:39.000Z | Open filing evidence |
All Other Segments · Interchange
Statement Business Segments · Product Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:ProductOrServiceAxis=nspw:InterchangeMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
All Other Segments · Retail Distribution
Statement Business Segments · Product Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:ProductOrServiceAxis=nspw:RetailDistributionMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
All Other Segments · Product
Statement Business Segments · Product Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:AllOtherSegmentsMember;srt:ProductOrServiceAxis=us-gaap:ProductMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2026-10-29 · 19:34:21.000Z | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1000000 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 2023-10-27 · 19:44:12.000Z | Open filing evidence |