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CONSOLIDATED STATEMENTS OF CAPITALIZATION (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Capitalization, Long-term Debt [Line Items]    
Unamortized discount $ (2,519)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet $ (2,321)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Total long-term debt, including current maturities 568,291us-gaap_LongTermDebt 468,597us-gaap_LongTermDebt
Less: current maturities 1,235us-gaap_LongTermDebtCurrent 107us-gaap_LongTermDebtCurrent
Total long-term debt 567,056us-gaap_LongTermDebtNoncurrent 468,490us-gaap_LongTermDebtNoncurrent
Common Stockholders' Equity    
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at Dec. 31, 2014 and 2013, respectively 93,300us-gaap_CommonStockValue 93,300us-gaap_CommonStockValue
Additional paid in capital 322,276us-gaap_AdditionalPaidInCapitalCommonStock 248,844us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 282,398us-gaap_RetainedEarningsAccumulatedDeficit 262,499us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (285)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (361)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total common stockholder’s equity 697,689us-gaap_StockholdersEquity 604,282us-gaap_StockholdersEquity
First Mortgage Bonds [Member] | Series Due Oct. 1, 2018 [Member]    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 150,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueOct12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 150,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueOct12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds [Member] | Series Due June 15, 2024    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 100,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueJune152024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueJune152024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds [Member] | Series Due Sept. 1, 2038 [Member]    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueSept12038Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueSept12038Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds [Member] | Series Due Oct. 1, 2042    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 100,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueOct12042Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 100,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueOct12042Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
City of La Crosse Resource Recovery Bond [Member] | Series Due Nov. 1, 2021 [Member]    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 18,600us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueNov12021Member
/ us-gaap_LongtermDebtTypeAxis
= nspw_CityOfLaCrosseResourceRecoveryBondMember		 [1] 18,600us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_SeriesDueNov12021Member
/ us-gaap_LongtermDebtTypeAxis
= nspw_CityOfLaCrosseResourceRecoveryBondMember		 [1]
Fort McCoy System Acquisition [Member] | Due Oct. 15, 2030 [Member]    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 523us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_DueOct152030Member
/ us-gaap_LongtermDebtTypeAxis
= nspw_FortMccoySystemAcquisitionMember		 558us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nspw_DueOct152030Member
/ us-gaap_LongtermDebtTypeAxis
= nspw_FortMccoySystemAcquisitionMember
Other    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross $ 1,687us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 $ 1,760us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
[1] Resource recovery financing