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REGULATORY MATTERS: Regulatory Requests (Details) - USD ($) $ in Thousands	Jun. 01, 2022	Dec. 31, 2023	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
Regulatory Assets		$ 1,653,050	$ 1,501,961
IDAHO | Jim Bridger Plant
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage	2.10%
Approved Rate Increase (Decrease), Percentage	1.50%
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 27,100
Approved Rate Increase (Decrease), Amount	$ 18,800

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

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- Definition

Percentage of public utility's approved rate increase (decrease) by regulatory agency.

+ References

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- Definition

Amount of public utility's amended requested rate increase (decrease) with regulatory agency.

+ References

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- Definition

Percentage of public utility's requested rate increase (decrease) with regulatory agency.

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481878/980-340-50-1

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