Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000072909-19-000004-index-headers.html | 2019-02-22 14:36:17 | |
| 0000072909-19-000004-index.html | 2019-02-22 14:36:17 | |
| 0000072909-19-000004.txt | 2019-02-22 14:36:17 | |
 0000072909-19-000004-xbrl.zip | 390338 | 2019-02-22 14:36:17 |
 chart-2f9dba7775035b43f46.jpg | 14536 | 2019-02-22 14:36:17 |
| FilingSummary.xml | 48996 | 2019-02-22 14:36:17 |
| Financial_Report.xlsx | 119790 | 2019-02-22 14:36:17 |
| nspw-20181231.xml | 3632724 | 2019-02-22 14:36:17 |
| nspw-20181231.xsd | 100202 | 2019-02-22 14:36:17 |
| nspw-20181231_cal.xml | 129455 | 2019-02-22 14:36:17 |
| nspw-20181231_def.xml | 534284 | 2019-02-22 14:36:17 |
| nspw-20181231_lab.xml | 1269372 | 2019-02-22 14:36:17 |
| nspw-20181231_pre.xml | 750505 | 2019-02-22 14:36:17 |
| nspw1231201810-k.htm | 2188245 | 2019-02-22 14:36:17 |
| nspwbylaws-amended012519.htm | 59618 | 2019-02-22 14:36:17 |
| nspwex2301q42018.htm | 4121 | 2019-02-22 14:36:17 |
| nspwex3101q42018.htm | 12288 | 2019-02-22 14:36:17 |
| nspwex3102q42018.htm | 12151 | 2019-02-22 14:36:17 |
| nspwex3201q42018.htm | 9436 | 2019-02-22 14:36:17 |
 nspwstate.jpg | 185903 | 2019-02-22 14:36:17 |
| R1.htm | 34034 | 2019-02-22 14:36:17 |
| R10.htm | 37412 | 2019-02-22 14:36:17 |
| R11.htm | 11809 | 2019-02-22 14:36:17 |
| R12.htm | 40654 | 2019-02-22 14:36:17 |
| R13.htm | 85894 | 2019-02-22 14:36:17 |
| R14.htm | 118752 | 2019-02-22 14:36:17 |
| R15.htm | 46352 | 2019-02-22 14:36:17 |
| R16.htm | 179742 | 2019-02-22 14:36:17 |
| R17.htm | 68693 | 2019-02-22 14:36:17 |
| R18.htm | 422284 | 2019-02-22 14:36:17 |
| R19.htm | 166505 | 2019-02-22 14:36:17 |
| R2.htm | 53959 | 2019-02-22 14:36:17 |
| R20.htm | 17951 | 2019-02-22 14:36:17 |
| R21.htm | 93200 | 2019-02-22 14:36:17 |
| R22.htm | 43805 | 2019-02-22 14:36:17 |
| R23.htm | 36045 | 2019-02-22 14:36:17 |
| R24.htm | 23509 | 2019-02-22 14:36:17 |
| R25.htm | 96370 | 2019-02-22 14:36:17 |
| R26.htm | 42493 | 2019-02-22 14:36:17 |
| R27.htm | 87532 | 2019-02-22 14:36:17 |
| R28.htm | 122654 | 2019-02-22 14:36:17 |
| R29.htm | 45803 | 2019-02-22 14:36:17 |
| R3.htm | 4620 | 2019-02-22 14:36:17 |
| R30.htm | 174700 | 2019-02-22 14:36:17 |
| R31.htm | 60862 | 2019-02-22 14:36:17 |
| R32.htm | 404117 | 2019-02-22 14:36:17 |
| R33.htm | 151395 | 2019-02-22 14:36:17 |
| R34.htm | 19610 | 2019-02-22 14:36:17 |
| R35.htm | 89115 | 2019-02-22 14:36:17 |
| R36.htm | 42484 | 2019-02-22 14:36:17 |
| R37.htm | 36883 | 2019-02-22 14:36:17 |
| R38.htm | 32842 | 2019-02-22 14:36:17 |
| R39.htm | 7876 | 2019-02-22 14:36:17 |
| R4.htm | 17012 | 2019-02-22 14:36:17 |
| R40.htm | 19077 | 2019-02-22 14:36:17 |
| R41.htm | 20672 | 2019-02-22 14:36:17 |
| R42.htm | 27697 | 2019-02-22 14:36:17 |
| R43.htm | 25254 | 2019-02-22 14:36:17 |
| R44.htm | 23214 | 2019-02-22 14:36:17 |
| R45.htm | 10925 | 2019-02-22 14:36:17 |
| R46.htm | 28677 | 2019-02-22 14:36:17 |
| R47.htm | 52729 | 2019-02-22 14:36:17 |
| R48.htm | 4974 | 2019-02-22 14:36:17 |
| R49.htm | 11764 | 2019-02-22 14:36:17 |
| R5.htm | 5103 | 2019-02-22 14:36:17 |
| R50.htm | 101696 | 2019-02-22 14:36:17 |
| R51.htm | 219928 | 2019-02-22 14:36:17 |
| R52.htm | 12086 | 2019-02-22 14:36:17 |
| R53.htm | 9771 | 2019-02-22 14:36:17 |
| R54.htm | 19621 | 2019-02-22 14:36:17 |
| R55.htm | 28342 | 2019-02-22 14:36:17 |
| R56.htm | 8079 | 2019-02-22 14:36:17 |
| R57.htm | 40114 | 2019-02-22 14:36:17 |
| R58.htm | 48717 | 2019-02-22 14:36:17 |
| R59.htm | 139580 | 2019-02-22 14:36:17 |
| R6.htm | 87236 | 2019-02-22 14:36:17 |
| R60.htm | 4685 | 2019-02-22 14:36:17 |
| R61.htm | 14766 | 2019-02-22 14:36:17 |
| R62.htm | 62231 | 2019-02-22 14:36:17 |
| R63.htm | 129938 | 2019-02-22 14:36:17 |
| R64.htm | 45935 | 2019-02-22 14:36:17 |
| R65.htm | 35032 | 2019-02-22 14:36:17 |
| R66.htm | 24455 | 2019-02-22 14:36:17 |
| R67.htm | 18824 | 2019-02-22 14:36:17 |
| R68.htm | 26490 | 2019-02-22 14:36:17 |
| R69.htm | 13311 | 2019-02-22 14:36:17 |
| R7.htm | 109976 | 2019-02-22 14:36:17 |
| R70.htm | 26425 | 2019-02-22 14:36:17 |
| R71.htm | 34988 | 2019-02-22 14:36:17 |
| R72.htm | 5980 | 2019-02-22 14:36:17 |
| R73.htm | 33128 | 2019-02-22 14:36:17 |
| R74.htm | 21818 | 2019-02-22 14:36:17 |
| R75.htm | 58244 | 2019-02-22 14:36:17 |
| R76.htm | 27323 | 2019-02-22 14:36:17 |
| R77.htm | 15026 | 2019-02-22 14:36:17 |
| R78.htm | 12349 | 2019-02-22 14:36:17 |
| R8.htm | 8525 | 2019-02-22 14:36:17 |
| R9.htm | 26708 | 2019-02-22 14:36:17 |
| report.css | 2767 | 2019-02-22 14:36:17 |
| Show.js | 1085 | 2019-02-22 14:36:17 |