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Nuclear Insurance (Details) - NSP Minnesota - Nuclear Insurance $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) Reactor
Nuclear Insurance [Abstract] |
Nuclear insurance coverage secured for the Company's public liability exposure | $ 500
Nuclear insurance coverage exposure funded by the Secondary Financial Protection Program | 15,800
Maximum assessments per reactor per accident | $ 166
Number of owned and licensed reactors | Reactor | 3
Maximum funding requirement per reactor for any one year | $ 25
Maximum assessments for business interruption insurance each calendar year | 19
Maximum assessment for property damage insurance NSP-Minnesota is subject to each calendar year | 34
Maximum |
Nuclear Insurance [Abstract] |
Loss Contingency, Estimate of Possible Loss | 16,300
Insurance coverage limits for NSP-Minnesota's nuclear plant sites | 2,800
Business Interruption Insurance Coverage Provided by NEIL | 490
Business Interruption Insurance Coverage Provided by NEIL - Prairie Island | $ 420

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