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INVESTMENTS: Investments Level 4 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Summary of investments in debt and equity securities |  |  |
Equity method investment | $ 9,529 | $ 9,666 |
Investments in affordable housing | 50,422 | 54,654 |
Other Investments | 5,948 | 4,099 |
Total investments | 155,002 | 161,340 |
Earnings of unconsolidated equity-method investments | 4,922 | 4,539 | $ 12,426
Debt Securities, Held-to-Maturity, Purchase | $ (2,896) | (1,845) | (1,617)
Idaho Power Company |  |  |
Summary of investments in debt and equity securities |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 33.00% |  |
Corporate Fixed-Income And Asset-Backed Debt Securities |  |  |
Summary of investments in debt and equity securities |  |  |
Debt Securities, Held-to-Maturity, Purchase | $ 2,900 | 1,800 |
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 1,400 | 2,700 |
Idaho Power Company |  |  |
Summary of investments in debt and equity securities |  |  |
Equity method investment | 16,833 | 20,998 |
Cash, Cash Equivalents, and Short-term Investments | 37,232 | 38,873 |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 33,822 | 32,151 |
Executive Deferred Compensation Plan Assets | 1,216 | 899 |
Total investments | $ 89,103 | 92,921 |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 33.00% |  |
Earnings of unconsolidated equity-method investments | $ 2,984 | 2,671 | 10,540
Gross realized gains from sales | 0 | 0 | 0
Debt Securities, Held-to-Maturity, Purchase | (2,896) | (1,845) | (1,617)
Bridger Coal Company |  |  |
Summary of investments in debt and equity securities |  |  |
Earnings of unconsolidated equity-method investments | $ 2,984 | 2,671 | 10,540
Ida-West Energy |  |  |
Summary of investments in debt and equity securities |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00% |  |
Earnings of unconsolidated equity-method investments | $ 1,938 | $ 1,868 | $ 1,886

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(9)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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