Regulatory Matters - Schedule of Changes in The Deferred Fuel and Purchased Power Regulatory Asset (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Change in regulatory asset
Deferred fuel and purchased power costs — current period	$ 64,220	$ 191,304
Amounts charged to customers	(204,748)	(218,586)
APS
Change in regulatory asset
Deferred fuel and purchased power costs — current period	64,220	191,304
Amounts charged to customers	(204,748)	(218,586)
Power Supply Adjustor (PSA) | ACC | APS
Change in regulatory asset
Beginning balance	463,195	460,561
Deferred fuel and purchased power costs — current period	64,220	191,304
Amounts charged to customers	(204,748)	(218,586)
Ending balance	$ 322,667	$ 433,279