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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2026
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following table provides detail of Pinnacle West’s consolidated revenues disaggregated by revenue sources (dollars in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30, |  |
| 2026 |  | 2025 |  | 2026 |  | 2025 |  |  |  |  |  |
Retail Electric Service |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 695,702 |  |  | $ | 651,666 |  |  | $ | 1,189,403 |  |  | $ | 1,100,589 |  |  |  |  |  |  |
Non-Residential | 708,268 |  |  | 654,038 |  |  | 1,310,001 |  |  | 1,178,895 |  |  |  |  |  |  |
Wholesale Energy Sales | 13,709 |  |  | 17,893 |  |  | 28,685 |  |  | 42,717 |  |  |  |  |  |  |
Transmission Services for Others | 29,188 |  |  | 31,996 |  |  | 61,215 |  |  | 57,543 |  |  |  |  |  |  |
Other Sources | 8,882 |  |  | 3,158 |  |  | 16,042 |  |  | 11,287 |  |  |  |  |  |  |
Total Operating Revenues | $ | 1,455,749 |  |  | $ | 1,358,751 |  |  | $ | 2,605,346 |  |  | $ | 2,391,031 |  |  |  |  |  |  |
Schedule of Allowance for Doubtful Accounts | The following table provides a rollforward of Pinnacle West’s allowance for doubtful accounts (dollars in thousands):
|  | Six Months Ended |  | Year Ended |  |  |  |
|  | June 30, 2026 |  | December 31, 2025 |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 25,495 |  |  | $ | 24,849 |  |  |  |  |  |  |  |  |
Bad debt expense |  | 13,528 |  |  | 28,603 |  |  |  |  |  |  |  |  |
Actual write-offs |  | (16,618) |  |  | (27,957) |  |  |  |  |  |  |  |  |
Balance at end of period |  | $ | 22,405 |  |  | $ | 25,495 |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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