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v3.25.3

Debt and Liquidity Matters - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 04, 2025 | Aug. 15, 2025 | May 15, 2025 | Apr. 29, 2025 | Dec. 23, 2024 | Dec. 20, 2024 | Dec. 05, 2024 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  |  |  |  |  |  |  | 2,199,415 |  |
February 2024 Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  |  |  | 5,377,115 |  |  | 243,186 |  |  |
Proceeds from issuance of common stock | $ 15,350 |  |  |  | $ 345,049 |  |  | $ 15,000 |  |  |
APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity infusion from Pinnacle West |  |  | $ 300,000 |  |  |  |  |  | $ 300,000 | $ 450,000 |
Public utilities, request to permanently modify permitted yearly equity infusions |  |  |  |  |  |  |  |  | 2.50% |  |
Public utilities, number of basis point of approved rate |  |  |  |  |  |  |  | 0.0050 | 0.0050 |  |
Term Loan | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  | 364 days |  |  |  |  | 364 days |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 400,000 |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  | 0.90% |  |  |  |
Repayments of unsecured debt |  | $ 400,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt |  |  |  | $ 400,000 |  |  |  |  |  |  |
Term Loan | Senior Notes | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt |  |  | $ 300,000 |  |  |  |  |  |  |  |
Senior Unsecured Notes Maturing May 2025 | Senior Notes | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.15% |  |  |  |  |  |  |  |
Senior Unsecured Notes Maturing August 2055 | Senior Notes | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 700,000 |  |  |  |  |  |  |  |  |
Interest rate |  | 5.90% |  |  |  |  |  |  |  |  |
Senior Unsecured Notes Maturing August 2034 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.70% |  |  |  |  |  |  |  |  |
Senior Unsecured Notes Maturing August 2034 | Senior Notes | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, increase (decrease), net |  | $ 250,000 |  |  |  |  |  |  |  |  |
Revolving credit facility | Revolving Credit Facility Maturing April 2029 | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  |  |  | $ 1,250,000 | $ 1,250,000 |  |
Accordion feature, increase limit |  |  |  |  |  |  |  | 400,000 | 400,000 |  |
Long-term line of credit |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
Debt, weighted average interest rate |  |  |  |  |  |  |  | 4.26% | 4.26% |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders |  |  |  |  |  |  |  | $ 1,650,000 | $ 1,650,000 |  |
Letter of Credit | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  | 33,200 | 33,200 |  |
Letter of Credit | Revolving Credit Facility Maturing April 2029 | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  | 0 | 0 |  |
Commercial paper | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  |
Commercial paper | Revolving Credit Facility Maturing April 2029 | APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  | 421,000 | $ 421,000 |  |
Pinnacle West | Term Loan |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  | 364 days |  |
Debt instrument, face amount |  |  |  |  |  |  |  | 200,000 | $ 200,000 |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  | 0.95% |  |
Loan amount drawn |  |  |  |  |  | $ 200,000 |  |  |  |  |
Pinnacle West | Senior Unsecured Notes Maturing May 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 400,000 |  |  |  |  |  |  |  |
Interest rate |  |  | 4.90% |  |  |  |  |  |  |  |
Pinnacle West | Senior Unsecured Notes Maturing May 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 400,000 |  |  |  |  |  |  |  |
Interest rate |  |  | 5.15% |  |  |  |  |  |  |  |
Pinnacle West | Senior Notes Maturing May 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 1.30% |  |  |  |  |  |  |  |
Repayments of unsecured debt |  |  | $ 500,000 |  |  |  |  |  |  |  |
Pinnacle West | Convertible Notes Due Maturing June 2027 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 525,000
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.75%
Pinnacle West | Revolving credit facility | Revolving Credit Facility Maturing April 2029 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  |  |  | 200,000 | $ 200,000 |  |
Accordion feature, increase limit |  |  |  |  |  |  |  | 300,000 | 300,000 |  |
Long-term line of credit |  |  |  |  |  |  |  | 0 | 0 |  |
Pinnacle West | Letter of Credit | Revolving Credit Facility Maturing April 2029 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  | 0 | 0 |  |
Pinnacle West | Commercial paper | Revolving Credit Facility Maturing April 2029 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  | $ 55,000 | $ 55,000 |  |
Debt, weighted average interest rate |  |  |  |  |  |  |  | 4.28% | 4.28% |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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