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REVENUES: Electric utility operating revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues [Abstract]
Revenue from contracts with customers	$ 1,746,972	$ 1,768,881	$ 1,639,612
Alternative revenue programs and other revenues	62,637	54,084	123,282
Electric utility revenues	$ 1,809,609	$ 1,822,965	$ 1,762,894

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The amount of regulated power revenues recognized during the period.

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The amount of regulated other operating revenues recognized during the period.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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