# EDGAR Filing Document

**Accession Number:** 0000764622
**File Stem:** 0000764622-25-000063
**Filing Date:** 2025-7
**Character Count:** 31499
**Document Hash:** 7f3a0ecfea8f315f8392e29101c42d6e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000764622-25-000063.hdr.sgml**: 20250722

**ACCESSION NUMBER**: 0000764622-25-000063

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 50

**CONFORMED PERIOD OF REPORT**: 20250722

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20250722

**DATE AS OF CHANGE**: 20250722

**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
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-08962
- **FILM NUMBER:** 251140488

**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
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-04473
- **FILM NUMBER:** 251140489

**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-20250722

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, DC 20549** 

**FORM 8-K** 

**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):** | July 22, 2025 |

---

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| | | | | |
|:---|:---|:---|:---|:---|
| **Commission File<br>Number** | **Exact Name of Registrant as Specified in<br>Charter; State or Other Jurisdiction of Incorporation; Address of Principal Executive Officers, and Zip Code; and<br>Telephone Number, Including Area Code)** | **Exact Name of Registrant as Specified in<br>Charter; State or Other Jurisdiction of Incorporation; Address of Principal Executive Officers, and Zip Code; and<br>Telephone Number, Including Area Code)** | **Exact Name of Registrant as Specified in<br>Charter; State or Other Jurisdiction of Incorporation; Address of Principal Executive Officers, and Zip Code; and<br>Telephone Number, Including Area Code)** | **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 |  |  |
|  | **Not Applicable** | **Not Applicable** | **Not Applicable** |  |
|  | (Former name or former address, if changed since last report.) | (Former name or former address, if changed since last report.) | (Former name or former address, if changed since last report.) |  |

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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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**Item 7.01&nbsp;&nbsp;&nbsp;&nbsp;Regulation FD Disclosure.**

Pinnacle West Capital Corporation ("Pinnacle West") will be participating in various meetings with securities analysts and investors in July 2025 and will be utilizing handouts during those meetings. Copies of the handouts are attached hereto as Exhibit 99.1.

**Item 9.01&nbsp;&nbsp;&nbsp;&nbsp;Financial Statements and Exhibits.** 

**&nbsp;&nbsp;&nbsp;&nbsp;(d)&nbsp;&nbsp;&nbsp;&nbsp;Exhibits** 

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| | | |
|:---|:---|:---|
| **Exhibit No.** | **Registrant(s)** | **Description** |
| 99.1 | Pinnacle West<br>Arizona Public Service Company | <u>[Pinnacle West handouts for use at meetings in J](julyinvestordeck.htm)[uly](julyinvestordeck.htm)[2025](julyinvestordeck.htm)</u> |
| 104 | Pinnacle West<br>Arizona Public Service Company | 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

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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.

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| | |
|:---|:---|
| | PINNACLE WEST CAPITAL CORPORATION |
| | (Registrant) |
| Dated: July 22, 2025 | By: /s/ Andrew Cooper |
|  | Andrew Cooper |
|  | Senior Vice President and |
|  | Chief Financial Officer |
|  | ARIZONA PUBLIC SERVICE COMPANY |
|  | (Registrant) |
| Dated: July 22, 2025 | By: /s/ Andrew Cooper |
|  | Andrew Cooper |
|  | Senior Vice President and |
|  | Chief Financial Officer |

---

## Exhibit 99.1

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Renewed, Reliable and Resilient July Investor Meetings

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2 This presentation contains forward-looking statements based on current expectations, including statements regarding our earnings guidance and financial outlook and goals. These forward-looking statements are often identified by words such as "estimate," "predict," "may," "believe," "plan," "expect," "require," "intend," "assume," "project," "anticipate," "goal," "seek," "strategy," "likely," "should," "will," "could," 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 Pinnacle West or APS. These factors include, but are not limited to: uncertainties associated with the current and future economic environment, including economic growth rates, labor market conditions, inflation, supply chain delays, increased expenses, volatile capital markets, or other unpredictable effects; current and future economic conditions in Arizona, such as the housing market and overall business and regulatory environment; our ability to manage capital expenditures and operations and maintenance costs while maintaining reliability and customer service levels; the direct or indirect effect on our facilities or business from cybersecurity threats or occurrences; variations in demand for electricity, including those due to weather, seasonality (including large increases in ambient temperatures), the general economy or social conditions, customer, and sales growth (or decline), the effects of energy conservation measures and distributed generation, and technological advancements; the potential effects of climate change on our electric system, including as a result of weather extremes such as prolonged drought and high temperature variations in the area where APS conducts its business; power plant and transmission system performance and outages; competition in retail and wholesale power markets; regulatory and judicial decisions, developments, and proceedings; new legislation, ballot initiatives and regulation or interpretations of existing legislation or regulations, including those relating to environmental requirements, regulatory and energy policy, nuclear plant operations and potential deregulation of retail electric markets; fuel and water supply availability; our ability to achieve timely and adequate rate recovery of our costs through our rates and adjustor recovery mechanisms, including returns on and of debt and equity capital investment; the ability of APS to meet renewable energy and energy efficiency mandates and recover related costs; the ability of APS to achieve its clean energy goals and, if these goals are achieved, the impact of such achievement on APS, its customers, and its business, financial condition, and results of operations; risks inherent in the operation of nuclear facilities, including spent fuel disposal uncertainty; data security breaches, terrorist attack, physical attack, severe storms, or other catastrophic events, such as fires, explosions, pandemic health events or similar occurrences; the development of new technologies which may affect electric sales or delivery, including as a result of delays in the development and application of new technologies; the cost of debt, including increased cost as a result of rising interest rates, and equity capital and our ability to access capital markets when required; environmental, economic, and other concerns surrounding coal-fired generation, including regulation of greenhouse gas emissions; volatile fuel and purchased power costs; the investment performance of the assets of our nuclear decommissioning trust, captive insurance cell, coal mine reclamation escrow, pension, and other postretirement benefit plans and the resulting impact on future funding requirements; the liquidity of wholesale power markets and the use of derivative contracts in our business; potential shortfalls in insurance coverage; new accounting requirements or new interpretations of existing requirements; generation, transmission and distribution facilities and system conditions and operating costs; our ability to meet the anticipated future need for additional generation and associated transmission facilities in our region; the willingness or ability of counterparties, power plant participants and power plant landowners to meet contractual or other obligations or extend the rights for continued power plant operations; and restrictions on dividends or other provisions in our credit agreements and ACC orders. These and other factors are discussed in the most recent Pinnacle West/APS Form 10-K along with other public filings with the Securities and Exchange Commission, which you should review carefully before placing any reliance on our financial statements, disclosures or earnings outlook. Neither Pinnacle West nor APS assumes any obligation to update these statements, even if our internal estimates change, except as required by law. In this presentation, references to net income and earnings per share (EPS) refer to amounts attributable to common shareholders. Forward Looking Statements

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1. Company Profile 2. Growth Outlook & Energy Future 3. Financial Outlook **Table of Contents**

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Company Profile

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Key facts as of Dec. 31, 2024 Consolidated assets $26B Market cap $9.64B Generating capacity owned or leased (year end) 6.5GW Customers 1.4M Current % from clean energy 54% Retail sales mix (Residential/Non-Residential) 52%/48% Service Territory 5 Arizona's largest electric company As of December 31, 2024.

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Growth Outlook & Energy Future

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2.3% 2.4% 2.2% 2.1% 2.1% 1.5%-2.5% 0% 1% 2% 3% 2020 2021 2022 2023 2024 2025E Residential Customer Growth1 APS Residential Growth Natn'l Avg.-Residential 7 • Phoenix housing is affordable compared to major cities in the region • U.S. Census ranked Maricopa County third among U.S. counties for growth • Phoenix is ranked #1 out of 15 top growth markets for manufacturing by Newmark Group, a global real estate firm • Arizona State University ranked #1 in Innovation for 10th straight year by U.S. News and World Report • Phoenix remains #1 as best positioned industrial real estate market by Commercial Café Report Arizona economy continues to be robust and attractive 1National average from 2024 Itron Annual Energy Survey Report. Arizona continues to be an attractive service territory with strong customer growth - 10,000 20,000 30,000 40,000 2012 2016 2020 2024 New APS Customer Meter Sets

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• Infrastructure ─ close proximity to major markets in the West with accessibility by rail or truck • Weather predictability ─ low propensity for natural disasters and greatest solar irradiance in America • Workforce availability ─ three major universities graduating a skilled labor force • Affordability ─ business friendly policies and regulation • Accounts for 3%-5% of the 4%-6% long-term weather normalized sales growth1 guidance • Amplifier effect for jobs and surrounding communities leading to residential growth • Proposed rate design modifications including direct assignment of generation costs to ensure growth pays for growth Large C&I customers as a growth driver Arizona is an attractive location for business growth Best-in-class service territory supports high tech growth and economic development 8 1 Forecasted guidance range through 2027.

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Source: Arizona Commerce Authority 9 Arizona's commercial and industrial growth is diverse

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• Balanced, constructive and more consistent outcomes, including improved ROE to APS • Approval of Formula Rate Policy Statement • Reaffirmation of Rate Case Settlement Policy • Continued support of adjustor mechanisms to improve cost recovery, including SRB 10 Commitments by the Company • Sustain investment in customer experience improvements • Continue to find alignment with regulators and work with stakeholders on common issues • Advocate for reduced regulatory lag • Focus on customer affordability Improvements at the Arizona Corporation Commission We have an improved regulatory environment

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11 • Projects that compete on cost and reliability from All-Source Request for Proposals • Determines prudency of new generation between general rate cases • Included in rates approximately 180 days after in service with Commission approval • Recovery at prevailing WACC less 100bps until future rate case • Traditional AFUDC treatment until asset is in service System Reliability Benefit Surcharge Key Features Continued Progress on Potential SRB Opportunities Proposed Project MWs Est. In-Service Status Agave BESS (Phase I) 150 2026 In Construction Sundance Expansion 90 2026 In Construction Ironwood Solar 168 2026 In Construction Redhawk Expansion 397 2028 Contracted SRB will expand our capacity to self-build generation to meet customer need with reduced lag

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Source: APS 2024-2033 Ten Year Transmission System Plan Support customer growth Access to markets Increase resiliency 12 Making progress on multiple strategic transmission opportunities as part of 2025-2027 capital expenditure plan Line Length (miles) Voltage Status Est. In- Service Sundance to Milligan 22 230 kV Siting in progress 2027 Ocotillo to Pinnacle Peak 25 230 kV Siting in progress 2029 Panda to Freedom 40 230 kV Siting in progress 2029 Jojoba to Rudd 25 500 kV Siting in progress 2030 Transmission expansion will drive increased capital investment

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Maintaining Affordability • Disciplined cost management: Process improvements and preventative maintenance to reduce operating costs • Customer growth: Long-term goal of declining O&M per MWh as service territory grows • Customer Programs: Innovative customer programs to help customers save energy and money • Balanced long-term capital plan: Infrastructure investments designed to maintain reliability and spread costs • Stakeholder engagement: working with partners to ensure reliability, affordability, and recovery through appropriate rate design 13 3.78% 4.75% 2.53% 0% 6% 2018 2019 2020 2021 2022 2023 2024 Average annual % change 2018-2024 CPI CPI (PHX) APS Rates APS rates have remained well below the rate of inflation We are focused on maintaining customer affordability

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Future Financial Outlook

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1. Long-term EPS growth of 5%-7% off original 2024 midpoint, supporting competitive total shareholder return 2. Optimized capital plan to reliably serve growing service territory, driving strong rate base growth and supported by SRB 3. Managing a healthy capital structure with accretive equity to support investment 4. Declining O&M per MWh with focus on customer affordability 5. Competitive shareholder dividend 6. Solid balance sheet and credit ratings 15 Our investor goals going forward

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Potential drivers for more consistent and timely cost recovery EPS Growth off original 2024 midpoint1 5%-7% CAGR • Reduction of regulatory lag including formula rates • Rate case cadence and potential settlement of future rate cases • Continued support of adjustor mechanisms • Continued economic development driving sales and customer growth • Continued cost management 16 Long-term outlook potential remains solid 1 Long-term EPS growth target based on the Company's current weather normalized compound annual growth rate projections from 2024-2028.

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$7.80B $9.66B 2023-2026E 2024-2027E CapEx Profile $273 $380 $335 $275 $637 $665 $670 $675 $340 $450 $675 $750 $807 $905 $870 $950 2024 2025E 2026E 2027E APS Total 2024-2027 $9.66B Generation Transmission Distribution Other $2.06B $2.40B $2.55B $2.65B Source: 2025-2027 as disclosed in the First Quarter 2025 Form 10-Q Q4 2023 Today 17 Capital plan to support reliability and continued growth within our service territory

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Current Approved Rate Base and Test Year Detail End-of-Year Rate Base and Growth Guidance1 ACC FERC Rate Effective Date 03/08/2024 06/01/2025 Test Year Ended 6/30/20221 12/31/2024 Equity Layer 51.93% 52.28% Allowed ROE 9.55% 10.75% Rate Base $10.36B2 $2.47B $11.23 $12.23 $14.4 $2.12 $2.52 $3.2 2023A 2024A 2025 2026 2027 ACC FERC 18 Rate base $ in billions, rounded Projected 1 Guidance excludes CWIP amounts of $1.7B in 2023 and $3.0B-$3.5B in 2027. 2 Derived from APS annual update of formula transmission service rates. 3 Represents unadjusted ACC jurisdictional rate base consistent with regulatory filings. 1 Adjusted to include post-test year plant in service through 06/30/2023. 2 Rate Base excludes $215M approved through Joint Resolution in Case No. E-01345A-19-0236. Generation spend through System Reliability Benefit Surcharge and transmission spend expected to total ~40% of tracked capital from 2024-2027 and help reduce regulatory lag Rate Base growing within our service territory

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Approx. $3.6B Cash from Operations1 Total Capital Investment $2.5B-$2.7B APS Debt2 $500M-700M PNW Debt2 1 Cash from operations is net of shareholder dividends. 2 APS and PNW debt issuance is net of maturities. • External equity to support balanced APS capital structure and expanded, accretive capital investment • Equity needs < prior targeted 40% of new capital • Financing plan consistent with balance sheet targets • In May 2025 PNW issued $800M unsecured bonds; proceeds used to pay off $500M PNW 2025 maturity and $300M APS 2025 maturity Funding Strategy 2025-2027 Financing Plan Approx. $7.6B $700-900M PNW Equity 19 Optimized financing plan to support balanced capital structure Feb. 2024 Forward Sale Priced Settled Dec. 2024 Partial Settlement $725M $345M Forward ATM Program ($900M) Priced Settled ATM Program $100M $0 ATM program: PNW may sell up to $900M of common stock Completed Equity

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20 Operations & Maintenance Guidance • Reduced year-over-year core O&M excluding planned outages • Planned major outage in Q1 at Four Corners Unit 4 • Lean culture and declining O&M per MWh goal We are focused on cost control and customer affordability $955 $910 - $920 $141 $150 - $160 $70 $55 - $65 2024 2025E O&M Guidance (millions) Planned Outages RES/DSM Core O&M

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3.59% 4.67% 2.97% 2017 2018 2019 2020 2021 2022 2023 2024 Average annual % change 2017-2024 CPI CPI (PHX) PNW O&M 21 1 O&M amounts, as adjusted, exclude RES/DSM of $141M and include planned outage amounts of $70M in 2024. $32 2024 PNW O&M (as adjusted) per MWh1 O&M per MWh Weather Normalized Sales (MWh) Long term goal remains declining O&M per MWh

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$2.50 $3.58 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Annualized Dividends per Share ~4.1% DPS CAGR Dividend Targets • Long-term dividend growth • Attractive dividend yield • Managing long-term dividend payout ratio into sustained 65-75% 22 1 Future dividends are subject to declaration at Board of Directors' discretion. We have a proven dividend growth track record 1

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Balance Sheet Targets • Solid investment-grade credit ratings • APS equity layer >50% • PNW FFO/Debt range of 14%-16% Corporate Ratings Senior Unsecured Ratings Short-Term Ratings Outlook APS Moody's Baa1 Baa1 P-2 Stable S&P BBB+ BBB+ A-2 Stable Fitch BBB+ A- F2 Stable Pinnacle West Moody's Baa2 Baa2 P-2 Stable S&P BBB+ BBB A-2 Stable Fitch BBB BBB F3 Stable 23 1 We are disclosing credit ratings to enhance understanding of our sources of liquidity and the effects of our ratings on our costs of funds. Ratings are as of April 28, 2025. We are focused on maintaining healthy credit ratings to support affordable growth1

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$0 $200 $400 $600 $800 $1,000 $1,200 2026 2028 2030 2032 2034 2036 2038 2040 2042 2044 2046 2048 2050 APS Fixed APS Floating PNW Fixed PNW Floating($millions) As of June 30, 2025 24 Debt maturity profile shows well managed and stable financing plan

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25 • Service territory is one of the fastest growing in the nation with a diverse customer base • Improved regulatory environment with focus on reducing regulatory lag • Strong customer centric strategy focused on reliability and customer experience • Proven track record of efficient O&M practices and focus on customer affordability • Solid balance sheet and well managed financing plan • Attractive financial growth profile building off original 2024 midpoint We have a stable foundation with solid execution going forward

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2025 Rate Case

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27 2025 APS rate case application Overview of rate request ($ in millions) key components Rate Base Growth $208 12 months Post-test Year Plant $82 Fair Value Increment $101 WACC (7.63%) $129 Other (Base fuel, depreciation study, etc.) $143 Total Revenue Requirement $662 Adjustor Transfers $(82) Net Revenue Increase $580 Customer Net Revenue Impact on Day 1 13.99% Additional details • APS has requested rates become effective in the second half of 2026 • Docket number: E-01345A-25-0105 • Additional details, including filing, can be found at http://www.pinnaclewest.com/investors Numbers may not foot due to rounding.

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28 2025 APS rate case application Overview of rate request ($ in millions) key components Test Year Ended December 31, 2024 Total Rate Base - Adjusted $15.3B ACC Rate Base - Adjusted $12.5B Embedded Long-Term Cost of Debt 4.26% Allowed Return on Equity 10.70% ROE Band for Formula Rate +/- 20bps Capital Structure Long-Term Debt 47.65% Common Equity 52.35% Base Fuel Rate (¢/kWh) 4.3881¢/kWh Post-Test Year Plant period 12 months Proposed rate design modifications • Direct assignment of generation costs to ensure extra high load factor customers pay for the resources they require • Align rates with costs to move classes closer to their cost of service which supports small and medium sized businesses • Ensure growth pays for growth and offers significant customer protections

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29 2025 APS rate case application Formula Rate Adjustment Mechanism (FRAM) proposal • Historic test year, with authorized ROE and capital structure approved in most recent rate case • Inclusion of 12 months projected plant • System Reliability Benefit costs transferred into each formula reset • No rate adjustment if actual ROE falls within +/- 20 bps of authorized ROE • Revenue surplus/deficiency allocated based on ACC jurisdictional cost of service results FRAM proposed schedule ACC filing of Annual Update On or before July 31 Last day for data requests and to submit informal challenge(s) August 12 Last day for Company responses to informal challenge(s) August 26 Informal challenge(s) resolution deadline August 31 Rate effective date First September billing cycle Last day for data requests and to submit formal challenge(s) September 22 Last day for Company responses to formal challenge(s) October 6 Staff Report (if no hearing) October 31 Commission Decision December 1

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Appendix

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Case/Docket # Q1 Q2 Q3 Q4 2025 Rate Case E-01345A-25-0105: Notice of Intent filed May 15 Application filed June 13 ACC Letter of Sufficiency filed July 14 Power Supply Adjustor (PSA) E-01345A-22-0144: 2025 PSA rate reset effective March 1 PSA reset to be filed Nov. 26 Transmission Cost Adjustor E-01345A-22-0144: Filed May 15; effective June 1 Lost Fixed Cost Recovery E-01345A-25-XXXX: 2025 LFCR to be filed July 31 2025 LFCR effective Nov. 1 (if approved) ACC Inquiry Into Nuclear Issues E-00000A-25-0026: ACC Nuclear Issues Workshop held May 21 Resource Comparison Proxy E-01345A-24-0095: Updated RCP calculation filed May 1 RCP Update effective Sep. 1 Test Year Rules (Regulatory Lag) AU-00000A-23-0012: ACC adopted Formula Rates Policy Statement Dec. 13, 2024 2025 Summer Preparedness AU-99999A-25-0004: 2025 Summer Preparedness Workshop held Apr. 24 2026 RES Implementation Plan E-01345A-25-XXXX: 2026 RES plan filed July 1 2026 DSM Implementation Plan E-01345A-25-XXXX: 2026 DSM Plan 120-day extension request granted ACC Inquiry Into Natural Gas Infrastructure G-00000A-25-0029: ACC Natural Gas Infrastructure workshop 31 2025 Key Regulatory Dates

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0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2022 Applications 2023 Applications 2024 Applications 2025 Applications 200 216 108 20 2022 2023 2024 2025 Monthly data equals applications received minus cancelled applications. As of March 31, 2025, approximately 187,140 residential grid-tied solar photovoltaic (PV) systems have been installed in APS's service territory, totaling approximately 1,676 MWdc of installed capacity. Excludes APS Solar Partner Program, APS Solar Communities, and Flagstaff Community Partnership Program. Note: www.arizonagoessolar.org logs total residential application volume, including cancellations. Residential DG (MWdc) Annual Additions 32 Residential PV Applications

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$17 $14 $18 $18 $18 $16 $19 $26 $12 $15 $0 $5 $10 $15 $20 $25 $30 $35 $40 $45 $50 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Renewable Energy Demand Side Management 2024 $141 Million 2025 $33 Million 1 Renewable Energy and Demand Side Management expenses are substantially offset by adjustment mechanisms. Numbers may not foot due to rounding. ($ in millions pretax) 33 Renewable Energy & Demand Side Management expenses1

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($3) Q1 Q2 Q3 Q4 Variances vs. Normal All periods recalculated to current 10-year rolling average (2014 – 2023). Numbers may not foot due to rounding. ($ in millions pretax) 2025 Total Weather Impact: $(3) Million 34 2025 gross margin effects of weather

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35 Wildfire Mitigation Vegetation management Asset inspection Monitoring and awareness Operational mitigations • Comprehensive right- of-way clearance on maintained cycles • Defensible space around poles (DSAP) • Hazard tree program • Enhanced line patrols • Technology deployments • Drone use • Infra-red scans • Non-reclosing strategy • Public outreach program • Red Flag Warning protocols • Public Safety Power Shutoff (PSPS) • Dedicated team of meteorologists • Advanced fire modeling software • Cameras and weather stations • Federal & state agency partnerships Grid hardening investments • Ongoing distribution system upgrades • Mesh pole wrapping • Expulsion limiting fuses • Steel poles (if truck accessible) Internal: 18-person fire mitigation department engages across entire APS organization to plan and implement initiatives External: Member of 19 fire mitigation industry associations Independent third-party reviews of APS wildfire mitigation plan Our current practices are comprehensive and multi-faceted:

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Q1 Plant Unit Actual Duration in Days Redhawk CC2 60 Four Corners 4 72 Coal, Nuclear and Large Gas Planned Outages 36 2025 Planned Outage Schedule Q2 Plant Unit Estimated Duration in Days Palo Verde1 1 43 Four Corners 4 11 Q4 Plant Unit Estimated Duration in Days Palo Verde 3 36 1 Outage began at end of Q1

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