Commitments and Contingencies	6 Months Ended
Jun. 30, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure	Commitments and Contingencies Legal Matters Washington Climate Commitment Act In 2021, the Washington Legislature adopted the CCA, which establishes a GHG emissions cap-and-invest program that requires covered entities, including electric and natural gas utilities, to purchase allowances to cover their GHG emissions with a cap on available allowances beginning on January 1, 2023 that declines annually through 2050. The WDOE has provided an initial allocation of no-cost allowances to electric utilities, including PSE, for operations through 2026. However, qualifying electric utilities have been allowed to submit revised emissions forecasts approved by the Washington Commission to WDOE. PSE has filed revised forecasts for emissions associated with its 2023, 2025 and 2026 operations, all of which were approved by the Washington Commission. The WDOE approved the revised 2023 forecast and made modest adjustments to the 2026 revised forecast. PSE understands that WDOE will consider changes or adjustments to the 2025 forecast in October 2026, after WDOE has received verified actual emissions for electric operations for calendar year 2025 actual emissions. To the extent WDOE were to determine that an adjustment to the allocation of no-cost allowances for PSE electric operations for calendar year 2025 were appropriate or necessary, PSE understands that such adjustment would occur in the form of an increase or decrease to the allocation of no-cost allowances for PSE electric operations for calendar year 2027. Given the potential for future rule changes, including new draft rule amendments proposed in June 2026, and the WDOE's ability to adjust no-cost allowances for electric operations during the compliance period or make changes to rules governing the program, there is estimation uncertainty surrounding the Company's ability to estimate its compliance obligation for electric operations both on an annual basis and a four-year compliance period, prior to a final WDOE determination. Due to the uncertainty around the currently proposed draft rule amendments and the potential for other future rulemakings impacting the compliance obligation, including the true-up mechanism, which could impact periods within the first compliance period, PSE has recorded its compliance obligation based on its best estimate and is unable to determine a range of possible outcomes at this time. As uncertainties are resolved in future periods, the Company does not anticipate material impacts to its reported earnings due to the cost-recovery mechanisms that exist. For further information, see Part II, Item 8, Note 4, "Regulation and Rates" in the Company's Annual Report on Form 10-K for the year ended December 31, 2025. Other Commitments and Contingencies In addition to the contractual obligations and consolidated commercial commitments disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, during the six months ended June 30, 2026, the Company entered into new Electric Portfolio contracts with estimated payment obligations totaling $260.1 million through 2028. On July 22, 2025, the Company executed two agreements with the same counterparty that would provide the Company with the output of a 400.0 MW solar PV energy project and the capacity of a 200.0 MW battery energy storage system, both over a 25-year term. The total estimated payment obligation during the term of the agreements is approximately $2.1 billion. The agreements contain certain provisions that would allow the counterparty to terminate the agreements before August 31, 2026 for a nominal fee. For further information regarding the Company's commitments and contingencies, see Part II, Item 8, Note 15, "Commitments and Contingencies" in the Company's Annual Report on Form 10-K for the year ended December 31, 2025.

In 2021, the Washington Legislature adopted the CCA, which establishes a GHG emissions cap-and-invest program that requires covered entities, including electric and natural gas utilities, to purchase allowances to cover their GHG emissions with a cap on available allowances beginning on January 1, 2023 that declines annually through 2050.

The WDOE has provided an initial allocation of no-cost allowances to electric utilities, including PSE, for operations through 2026. However, qualifying electric utilities have been allowed to submit revised emissions forecasts approved by the Washington Commission to WDOE. PSE has filed revised forecasts for emissions associated with its 2023, 2025 and 2026 operations, all of which were approved by the Washington Commission. The WDOE approved the revised 2023 forecast and made modest adjustments to the 2026 revised forecast. PSE understands that WDOE will consider changes or adjustments to the 2025 forecast in October 2026, after WDOE has received verified actual emissions for electric operations for calendar year 2025 actual emissions. To the extent WDOE were to determine that an adjustment to the allocation of no-cost allowances for PSE electric operations for calendar year 2025 were appropriate or necessary, PSE understands that such adjustment would occur in the form of an increase or decrease to the allocation of no-cost allowances for PSE electric operations for calendar year 2027.

Given the potential for future rule changes, including new draft rule amendments proposed in June 2026, and the WDOE's ability to adjust no-cost allowances for electric operations during the compliance period or make changes to rules governing the program, there is estimation uncertainty surrounding the Company's ability to estimate its compliance obligation for electric operations both on an annual basis and a four-year compliance period, prior to a final WDOE determination. Due to the uncertainty around the currently proposed draft rule amendments and the potential for other future rulemakings impacting the compliance obligation, including the true-up mechanism, which could impact periods within the first compliance period, PSE has recorded its compliance obligation based on its best estimate and is unable to determine a range of possible outcomes at this time.

As uncertainties are resolved in future periods, the Company does not anticipate material impacts to its reported earnings due to the cost-recovery mechanisms that exist. For further information, see Part II, Item 8, Note 4, "Regulation and Rates" in the Company's Annual Report on Form 10-K for the year ended December 31, 2025.

In addition to the contractual obligations and consolidated commercial commitments disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, during the six months ended June 30, 2026, the Company entered into new Electric Portfolio contracts with estimated payment obligations totaling $260.1 million through 2028.

On July 22, 2025, the Company executed two agreements with the same counterparty that would provide the Company with the output of a 400.0 MW solar PV energy project and the capacity of a 200.0 MW battery energy storage system, both over a 25-year term. The total estimated payment obligation during the term of the agreements is approximately $2.1 billion. The agreements contain certain provisions that would allow the counterparty to terminate the agreements before August 31, 2026 for a nominal fee.