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Commitments and Contingencies Environmental Requirements - Water and Waste (Details) $ in Millions | Sep. 30, 2023 USD ($) sites Period
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Site Contingency [Line Items] |
Number of sites that will excavate and process ash for beneficial use | sites | 2
Number of sites where investigation and feasibility studies for additional corrective action related to offsite groundwater are ongoing | sites | 3
Federal Coal Ash Regulation |
Site Contingency [Line Items] |
Number of sites where regulated ash units will still be in operation at a specified date | Period | 8
Federal Coal Ash Regulation | PSCo |
Site Contingency [Line Items] |
Estimated cost to remediate groundwater sampling results | $ 40
Federal Coal Ash Regulation | PSCo | Maximum [Member] |
Site Contingency [Line Items] |
Cost of Beneficial Use Coal Ash Project | 45
Federal Clean Water Act Section 316 (b) | Capital Addition Purchase Commitments |
Site Contingency [Line Items] |
Liability for estimated cost to comply with regulation | $ 50

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