# EDGAR Filing Document

**Accession Number:** 0000764622
**File Stem:** 0000764622-25-000061
**Filing Date:** 2025-6
**Character Count:** 11205
**Document Hash:** 2e5f1ae90ede42bc14d4899d7cc0b764
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000764622-25-000061.hdr.sgml**: 20250616

**ACCESSION NUMBER**: 0000764622-25-000061

**CONFORMED SUBMISSION TYPE**: 8-K/A

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20250613

**ITEM INFORMATION**: Other Events

**FILED AS OF DATE**: 20250616

**DATE AS OF CHANGE**: 20250616

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PINNACLE WEST CAPITAL CORP
- **CENTRAL INDEX KEY:** 0000764622
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 860512431
- **STATE OF INCORPORATION:** AZ
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-08962
- **FILM NUMBER:** 251048464

**BUSINESS ADDRESS:**
- **STREET 1:** 400 NORTH FIFTH STREET
- **STREET 2:** MS 8695
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85004
- **BUSINESS PHONE:** 602 250 1000

**MAIL ADDRESS:**
- **STREET 1:** 400 NORTH FIFTH STREET
- **STREET 2:** MS 8695
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85004

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AZP GROUP INC
- **DATE OF NAME CHANGE:** 19870506
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ARIZONA PUBLIC SERVICE CO
- **CENTRAL INDEX KEY:** 0000007286
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 860011170
- **STATE OF INCORPORATION:** AZ
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-04473
- **FILM NUMBER:** 251048465

**BUSINESS ADDRESS:**
- **STREET 1:** 400 NORTH FIFTH STREET
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85004
- **BUSINESS PHONE:** 602 250 1000

**MAIL ADDRESS:**
- **STREET 1:** P O BOX 53999
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85072-3999

?xml version='1.0' encoding='ASCII'? pnw-20250613

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, DC 20549** 

**FORM 8-K/A** 

(Amendment No. 1)

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the**

**Securities Exchange Act of 1934**

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| | |
|:---|:---|
| **Date of report (Date of earliest event reported):** | June 13, 2025 |

---

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| | | | | |
|:---|:---|:---|:---|:---|
| **Commission File<br>Number** | **Exact Name of Each Registrant as specified in its<br>charter; State of Incorporation; Address; and<br>Telephone Number** | **Exact Name of Each Registrant as specified in its<br>charter; State of Incorporation; Address; and<br>Telephone Number** | **Exact Name of Each Registrant as specified in its<br>charter; State of Incorporation; Address; and<br>Telephone Number** | **IRS Employer<br>Identification No.** |
| 1-8962 | **PINNACLE WEST CAPITAL CORPORATION** | **PINNACLE WEST CAPITAL CORPORATION** | **PINNACLE WEST CAPITAL CORPORATION** | 86-0512431 |
|  | (an Arizona corporation) | (an Arizona corporation) | (an Arizona corporation) |  |
|  | 400 North Fifth Street, P.O. Box 53999 | 400 North Fifth Street, P.O. Box 53999 | 400 North Fifth Street, P.O. Box 53999 |  |
|  | Phoenix | Arizona | 85072-3999 |  |
|  | (602) | 250-1000 |  |  |
| 1-4473 | **ARIZONA PUBLIC SERVICE COMPANY** | **ARIZONA PUBLIC SERVICE COMPANY** | **ARIZONA PUBLIC SERVICE COMPANY** | 86-0011170 |
|  | (an Arizona corporation) | (an Arizona corporation) | (an Arizona corporation) |  |
|  | 400 North Fifth Street, P.O. Box 53999 | 400 North Fifth Street, P.O. Box 53999 | 400 North Fifth Street, P.O. Box 53999 |  |
|  | Phoenix | Arizona | 85072-3999 |  |
|  | (602) | 250-1000 |  |  |

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered <br> <u>Common Stock</u> <u>PNW</u> <u>The New York Stock Exchange</u>

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

This combined Form 8-K is separately filed or furnished by Pinnacle West Capital Corporation and Arizona Public Service Company. Each registrant is filing or furnishing on its own behalf all of the information contained in this Form 8-K that relates to such registrant and, where required, its subsidiaries. Except as stated in the preceding sentence, neither registrant is filing or furnishing any information that does not relate to such registrant, and therefore makes no representation as to any such information.

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**Explanatory Note**

This Current Report on Form 8-K/A (the "Amendment") amends the Current Report on Form 8-K filed on June 13, 2025 (the "Original Form 8-K") for the sole purpose of correcting the original cost rate base amount disclosed under Item 8.01. Other than as described in the previous sentence, this Amendment does not amend or update other disclosures in, or exhibits to, the Original Form 8-K. Accordingly, this Amendment should be read in conjunction with the Original Form 8-K. Capitalized terms used but not defined herein have the meanings assigned to them in the Original Form 8-K.

**Item 8.01 Other Events.**

***2025 Rate Case***

APS is seeking a net base rate increase of $579.52 million, representing a 13.99% net increase. The requested net increase addresses a total base revenue deficiency of $662.44 million, offset by proposed adjustor transfers of cost recovery to base rates.

The 2025 Rate Case application includes the following proposals:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• A test year comprised of the twelve month period ending on December 31, 2024, including certain pro forma adjustments;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Twelve months of post-test year plant placed into service from January 1, 2025 through December 31, 2025;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• An original cost rate base of $12.5 billion, which approximates the ACC-jurisdictional portion of the book value of utility assets, net of accumulated depreciation and other credits;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• The following proposed capital structure and costs of capital:

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| | | |
|:---|:---|:---|
| | **Capital Structure** | **Cost of Capital** |
| Long-term debt | 47.65 | 4.26 |
| Common stock equity | 52.35 | 10.7 |
| Weighted-average cost of capital |  | 7.63 |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• A 1% return on the increment of fair value rate base above APS's original cost rate base, as provided for by Arizona law;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• A rate of $0.043881 per kWh for the portion of APS's base rates attributable to fuel and purchased power costs;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Adjustments to rate designs to reduce cross-subsidization by certain customer classes;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Modification of cost allocation methodologies based on customer growth to ensure customers causing new production costs are covering those costs through rates, along with corresponding changes to adjustor mechanisms, such as for fuel and purchased power;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Implementation of a "Formula Rate Adjustment Mechanism" to assist with reducing regulatory lag and allow for rate gradualism;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Elimination of the Lost Fixed Cost Recovery Adjustment Mechanism following the first annual adjustment pursuant to the Formula Rate Adjustment Mechanism; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Modification to the System Reliability Benefit Mechanism due to the Formula Rate Adjustment Mechanism proposal.

APS requested that the increase become effective in the second half of 2026. APS cannot predict the outcome of its request nor when the 2025 Rate Case will be decided by the ACC.

***Forward-Looking Statements***

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This Report on Form 8-K and the application and related schedules for an annual increase in retail base rates filed with the ACC on June 13, 2025 contain forward-looking statements based on current expectations. These forward-looking statements are often identified by words such as "estimate," "predict," "may," "believe," "plan," "expect," "require," "intend," "assume" and similar words. Because actual results may differ materially from expectations, we caution you not to place undue reliance on these statements. A number of factors could cause future results to differ materially from historical results, or from outcomes currently expected or sought by us. A discussion of some of these risks and uncertainties is contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024 and our other Securities and Exchange Commission filings and are available on our website at http://www.pinnaclewest.com, which you should review carefully before placing any reliance on our forward-looking statements or disclosures. We assume no obligation to update any forward-looking statements, even if our internal estimates change, except as may be required by applicable law.

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SIGNATURES

&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

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| | |
|:---|:---|
| | PINNACLE WEST CAPITAL CORPORATION |
| | (Registrant) |
| Dated: June 16, 2025 | By: /s/ Andrew Cooper |
|  | Andrew Cooper |
|  | Senior Vice President and |
|  | Chief Financial Officer |
|  | ARIZONA PUBLIC SERVICE COMPANY |
|  | (Registrant) |
| Dated: June 16, 2025 | By: /s/ Andrew Cooper&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |
|  | Andrew Cooper |
|  | Senior Vice President and |
|  | Chief Financial Officer |

---