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El Dorado Equity Investments (Tables) | 6 Months Ended
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Jun. 30, 2026
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of El Dorado's Ownership Percentages and Carrying Value of Equity Method Investments | The following table presents El Dorado’s ownership percentages and carrying value of investments accounted for under the equity method (dollars in millions):
Investee | Pinnacle West Ownership Percentage as of June 30, 2026 |  | June 30, 2026 |  | December 31, 2025
SAI (a) | 18 | % |  | $ | 34 |  |  | $ | 21 |
Copper Sky (b) | 23 | % |  | 18 |  |  | 15 |
Total equity method investments |  |  | $ | 52 |  |  | $ | 36 |
(a)El Dorado has no further funding commitments to SAI. (b)El Dorado has a $25.0 million funding commitment to Copper Sky, previously AZ-VC, of which approximately $18.8 million has been funded as of June 30, 2026.

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-7 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-5A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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