# EDGAR Filing Document

**Accession Number:** 0000104918
**File Stem:** 0001193125-26-138034
**Filing Date:** 2026-4
**Character Count:** 304497
**Document Hash:** 3fe618581a3b0c2ba2d15730c72d7a81
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-138034.hdr.sgml**: 20260401

**ACCESSION NUMBER**: 0001193125-26-138034

**CONFORMED SUBMISSION TYPE**: DEF 14A

**PUBLIC DOCUMENT COUNT**: 76

**CONFORMED PERIOD OF REPORT**: 20260514

**FILED AS OF DATE**: 20260401

**DATE AS OF CHANGE**: 20260401

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AVISTA CORP
- **CENTRAL INDEX KEY:** 0000104918
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 910462470
- **STATE OF INCORPORATION:** WA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEF 14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-03701
- **FILM NUMBER:** 26828756

**BUSINESS ADDRESS:**
- **STREET 1:** 1411 E MISSION AVE
- **CITY:** SPOKANE
- **STATE:** WA
- **ZIP:** 99202
- **BUSINESS PHONE:** 5094890500

**MAIL ADDRESS:**
- **STREET 1:** 1411 EAST MISSION
- **CITY:** SPOKANE
- **STATE:** WA
- **ZIP:** 99202

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WASHINGTON WATER POWER CO
- **DATE OF NAME CHANGE:** 19920703

?xml version='1.0' encoding='ASCII'? DEF 14A

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#### UNITED STATES

#### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A INFORMATION

#### Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

#### (Amendment No.)
Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

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| ☐ Preliminary Proxy Statement<br>☐ **Confidential, for Use of the Commission Only**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (as permitted by Rule 14a-6(e)(2))**<br>|
| ☒ Definitive Proxy Statement |
| ☐ Definitive Additional Materials |
| ☐ Soliciting Material under §240.14a-12 |

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#### AVISTA CORPORATION
(Name of registrant as specified in its charter)

(Name of person(s) filing proxy statement, if other than the registrant)

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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![LOGO](g853530g00a01.jpg)

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| <br> Avista's 2026 Annual Meeting will be held at 8:00 a.m. Pacific Time on Thursday, May 14, 2026. This year's Annual Meeting of Shareholders will once again be held in a virtual format only. You will not be able to attend the Annual Meeting in person.<br>| ![LOGO](g853530g01h01.jpg) |
| <br> DEAR FELLOW SHAREHOLDER: <br>You will be able to participate in the Annual Meeting, vote, and submit your questions and comments during the Annual Meeting via live webcast by visiting *www.virtualshareholdermeeting.com/AVA2026.*<br>Whether or not you plan to participate in the Annual Meeting, I urge you to vote and submit your proxy prior to the Annual Meeting by mail, telephone or through the internet as soon as possible, following the instructions printed on your proxy card and/or proxy notice.<br>This Proxy Statement accompanies the 2025 Annual Report to Shareholders, which contains information about the Company's performance, including our audited financial statements.<br>My first year as CEO was marked by exciting opportunities for growth and investment as well as unprecedented uncertainty and stormy conditions (both literally and figuratively). Yet as we have for 136 years, our teams learned, innovated, and delivered.<br>Avista remains **invested in progress and grounded in resilience**: from making smart investments to maintain our ability to provide safe, reliable energy, to acting as a partner in the shared clean energy economy, to inspiring engaged and thriving employees, to our commitment to financial strength. Our investment in progress, rooted in a legacy of innovation, positions us to serve existing and future customers alike while delivering strong results to you, our shareholders.<br>Thank you for the opportunity to serve.<br>Sincerely,<br>![LOGO](g853530g56w82.jpg) <br>HEATHER ROSENTRATER<br> President and Chief Executive Officer<br>April 1, 2026<br> ![LOGO](g853530g28v94.jpg)  | <br> DEAR FELLOW SHAREHOLDER: <br>You will be able to participate in the Annual Meeting, vote, and submit your questions and comments during the Annual Meeting via live webcast by visiting *www.virtualshareholdermeeting.com/AVA2026.*<br>Whether or not you plan to participate in the Annual Meeting, I urge you to vote and submit your proxy prior to the Annual Meeting by mail, telephone or through the internet as soon as possible, following the instructions printed on your proxy card and/or proxy notice.<br>This Proxy Statement accompanies the 2025 Annual Report to Shareholders, which contains information about the Company's performance, including our audited financial statements.<br>My first year as CEO was marked by exciting opportunities for growth and investment as well as unprecedented uncertainty and stormy conditions (both literally and figuratively). Yet as we have for 136 years, our teams learned, innovated, and delivered.<br>Avista remains **invested in progress and grounded in resilience**: from making smart investments to maintain our ability to provide safe, reliable energy, to acting as a partner in the shared clean energy economy, to inspiring engaged and thriving employees, to our commitment to financial strength. Our investment in progress, rooted in a legacy of innovation, positions us to serve existing and future customers alike while delivering strong results to you, our shareholders.<br>Thank you for the opportunity to serve.<br>Sincerely,<br>![LOGO](g853530g56w82.jpg) <br>HEATHER ROSENTRATER<br> President and Chief Executive Officer<br>April 1, 2026<br> ![LOGO](g853530g28v94.jpg)  |

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## NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
2026 Annual Meeting Information

 <br> DATE AND TIME May 14, 2026 at 8:00 a.m. Pacific Time LOCATION www.virtualshareholdermeeting.com/AVA2026

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| The purposes of the meeting are to: | The purposes of the meeting are to: |  |
| 1 | Elect eleven directors identified in the accompanying proxy statement to serve until the 2027 Annual Meeting of Shareholders; | **THIS PROXY STATEMENT AND THE 2025 ANNUAL REPORT ARE AVAILABLE ON THE INTERNET AT HTTP://PROXYVOTE.COM**<br> ![LOGO](g853530g95l48.jpg) <br>![LOGO](g853530g28v94.jpg) <br> 1411 E. Mission Ave.<br> Spokane, Washington 99202 |
| 2 | Ratify the appointment of Deloitte & Touche LLP, the member firms of Deloitte Touche Tohmatsu, Ltd., and their respective affiliates (collectively, "Deloitte") as the Company's independent registered public accounting firm for 2026; | **THIS PROXY STATEMENT AND THE 2025 ANNUAL REPORT ARE AVAILABLE ON THE INTERNET AT HTTP://PROXYVOTE.COM**<br> ![LOGO](g853530g95l48.jpg) <br>![LOGO](g853530g28v94.jpg) <br> 1411 E. Mission Ave.<br> Spokane, Washington 99202 |
| 3 | Hold an advisory (non-binding) vote on executive compensation; | **THIS PROXY STATEMENT AND THE 2025 ANNUAL REPORT ARE AVAILABLE ON THE INTERNET AT HTTP://PROXYVOTE.COM**<br> ![LOGO](g853530g95l48.jpg) <br>![LOGO](g853530g28v94.jpg) <br> 1411 E. Mission Ave.<br> Spokane, Washington 99202 |
| 4 | Amend the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80 percent of the total number of shares of common stock outstanding to a majority of such shares outstanding; and | **THIS PROXY STATEMENT AND THE 2025 ANNUAL REPORT ARE AVAILABLE ON THE INTERNET AT HTTP://PROXYVOTE.COM**<br> ![LOGO](g853530g95l48.jpg) <br>![LOGO](g853530g28v94.jpg) <br> 1411 E. Mission Ave.<br> Spokane, Washington 99202 |
| 5 | Transact other business that may come before the meeting or any adjournment or postponement thereof. | **THIS PROXY STATEMENT AND THE 2025 ANNUAL REPORT ARE AVAILABLE ON THE INTERNET AT HTTP://PROXYVOTE.COM**<br> ![LOGO](g853530g95l48.jpg) <br>![LOGO](g853530g28v94.jpg) <br> 1411 E. Mission Ave.<br> Spokane, Washington 99202 |
| <br> Shareholders of record may participate in the Annual Meeting by logging in at *www.virtualshareholdermeeting.com/AVA2026*. Please refer to the Additional Information for guidance regarding participation in the Annual Meeting.<br>Your vote is very important to us.<br>You can be sure your shares are represented at the meeting if you are a shareholder of record by promptly voting over the internet or by telephone or by returning your completed proxy card in the pre-addressed, postage-paid return envelope (which will be provided to those shareholders who request to receive paper copies of these materials by mail), or, if your shares are held through an account with a brokerage firm, bank or other nominee, by returning your completed voting instruction card to your broker or nominee. The proxy is solicited by the Board of Directors of Avista Corp.<br>We cordially invite you to attend the meeting.<br>By Order of the Board,<br>![LOGO](g853530g04v04.jpg) <br>GREGORY C. HESLER<br> Senior Vice President, General Counsel,<br> Corporate Secretary and Chief Ethics/Compliance Officer<br>Spokane, Washington<br> April 1, 2026 | <br> Shareholders of record may participate in the Annual Meeting by logging in at *www.virtualshareholdermeeting.com/AVA2026*. Please refer to the Additional Information for guidance regarding participation in the Annual Meeting.<br>Your vote is very important to us.<br>You can be sure your shares are represented at the meeting if you are a shareholder of record by promptly voting over the internet or by telephone or by returning your completed proxy card in the pre-addressed, postage-paid return envelope (which will be provided to those shareholders who request to receive paper copies of these materials by mail), or, if your shares are held through an account with a brokerage firm, bank or other nominee, by returning your completed voting instruction card to your broker or nominee. The proxy is solicited by the Board of Directors of Avista Corp.<br>We cordially invite you to attend the meeting.<br>By Order of the Board,<br>![LOGO](g853530g04v04.jpg) <br>GREGORY C. HESLER<br> Senior Vice President, General Counsel,<br> Corporate Secretary and Chief Ethics/Compliance Officer<br>Spokane, Washington<br> April 1, 2026 | **THIS PROXY STATEMENT AND THE 2025 ANNUAL REPORT ARE AVAILABLE ON THE INTERNET AT HTTP://PROXYVOTE.COM**<br> ![LOGO](g853530g95l48.jpg) <br>![LOGO](g853530g28v94.jpg) <br> 1411 E. Mission Ave.<br> Spokane, Washington 99202 |

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Important Information About Avista's Virtual Annual Meeting

Avista Corporation's ("Avista" or the "Company") 2026 Annual Meeting of Shareholders (the "Annual Meeting") will be held virtually by live webcast. Shareholders of record at the close of business on March 13, 2026, are entitled to participate in the meeting and participants will be able to ask questions, make comments and vote on the matters brought before the meeting. Below are some frequently asked questions regarding our Annual Meeting.

How can I view and participate in the Annual Meeting? To participate, visit *www.virtualshareholdermeeting.com/AVA2026* and log in with the 16-digit control number included in your proxy materials.

When can I join the virtual Annual Meeting? You may begin to log in to the meeting platform beginning at 7:45 a.m. Pacific Time on May 14, 2026. The meeting begins at 8:00 a.m. Pacific Time on May 14, 2026.

How can I ask questions and vote? We encourage you to submit your questions and vote in advance by visiting *www.proxyvote.com*. Shareholders may also vote and submit questions virtually during the meeting (subject to time restrictions). During the meeting, questions can only be submitted in the question box provided in the virtual meeting webcast. To participate in the meeting webcast, visit *www.virtualshareholdermeeting.com/AVA2026*.

What if I lost my 16-digit control number? You will be able to log in as a guest. To view the meeting webcast, visit *www.virtualshareholdermeeting.com/AVA2026* and register as a guest. If you log in as a guest, you will not be able to vote your shares or ask questions during the meeting.

What if I experience technical difficulties? Please call (844) 986-0822 (US) or 1 (412) 317-5419 (international) for assistance.

Where can I find additional information? For additional information about how to attend the Annual Meeting, please refer to the Additional Information section.

A recording of the Annual Meeting will be posted as soon as practical at *https://investor.avistacorp.com* along with answers to a representative set of any shareholder questions received before and during the Annual Meeting not answered due to time constraints. We also encourage you to read our Annual Report on Form 10-K available at *www.proxyvote.com*.

**Your vote is important to us! Please vote today at www.proxyvote.com.** 

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![LOGO](g853530g16v91.jpg)

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| **TABLE OF CONTENTS** | **TABLE OF CONTENTS** |
| 1 | [PROXY SUMMARY](#toc853530_1) |
| 1 | [GOVERNANCE HIGHLIGHTS](#toc853530_2) |
| 3 | [COMPENSATION HIGHLIGHTS](#toc853530_3) |
| 4 | [PROPOSAL 1: ELECTION OF DIRECTORS](#toc853530_4) |
| 19 | [CORPORATE GOVERNANCE MATTERS](#toc853530_5) |
| 28 | [DIRECTOR COMPENSATION](#toc853530_6) |
| 30 | [AUDIT COMMITTEE REPORT](#toc853530_7) |
| 32 | [PROPOSAL 2: RATIFICATION OF APPOINTMENT OF DELOITTE AS<br>INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR 2026](#toc853530_8) |
| 35 | [COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")](#toc853530_9) |
| 52 | [EXECUTIVE COMPENSATION TABLES](#toc853530_10) |
| 67 | [PROPOSAL 3: ADVISORY VOTE ON EXECUTIVE COMPENSATION](#toc853530_11) |
| 69 | [PROPOSAL 4: AMENDMENT OF RESTATED ARTICLES OF INCORPORATION TO REDUCE CERTAIN SHAREHOLDER APPROVAL REQUIREMENTS](#toc853530_12) |
| 71 | [SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT](#toc853530_13) |
| 73 | [SECTION 16 (A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE](#toc853530_14) |
| 73 | [ANNUAL REPORT AND FINANCIAL STATEMENTS](#toc853530_15) |
| 73 | [HOUSEHOLDING](#toc853530_16) |
| 73 | [OTHER BUSINESS](#toc853530_17) |
| 74 | [ADDITIONAL INFORMATION](#toc853530_18) |
| 78 | [2027 ANNUAL MEETING INFORMATION](#toc853530_19) |

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## HELPFUL RESOURCES
Where You Can Find More Information

ANNUAL MEETING

Proxy Statement:

https://investor.avistacorp.com/financial-information/ annual-reports

Annual Report:

https://investor.avistacorp.com/financial-information/ annual-reports

Vote Your Proxy via the Internet Before the Annual Meeting:

www.proxyvote.com

BOARD OF DIRECTORS

https://investor.avistacorp.com/corporate-governance/management#board_directors

COMMUNICATIONS WITH THE BOARD

Corporate Secretary

1411 E Mission Avenue

PO Box 3727 (MSC-10)

Spokane, WA 99220

GOVERNANCE DOCUMENTS

Committee Charters:

https://investor.avistacorp.com/corporate-governance/management#board_committees

Policies and Guidelines:

https://www.myavista.com/about-us/policies-and-guidelines

INVESTOR RELATIONS

https://investor.avistacorp.com/

CORPORATE RESPONSIBILITY

https://investor.avistacorp.com/corporate-responsibility/our-commitment

Definition of Certain Terms or Abbreviations

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|:---|:---|
| &nbsp;&nbsp; ASC | Accounting Standards Codification |
| &nbsp;&nbsp; CAP | Compensation Actually Paid |
| &nbsp;&nbsp; CEO | Chief Executive Officer |
| &nbsp;&nbsp; CEPS | Cumulative Earnings Per Share |
| &nbsp;&nbsp; CFO | Chief Financial Officer |
| &nbsp;&nbsp; CIC | Change in Control |
| &nbsp;&nbsp; Deloitte | Deloitte & Touche LLP, the member firms of Deloitte Touche Tomatsu, Ltd., and their respective affiliates |
| &nbsp;&nbsp; EDC Plan | Executive Deferred Compensation Plan |
| &nbsp;&nbsp; EPS | Earnings Per Share |
| &nbsp;&nbsp; ERM | Energy Recovery Mechanism |
| &nbsp;&nbsp; FASB | Financial Accounting Standards Board |
| &nbsp;&nbsp; GAAP | Generally Accepted Accounting Principles |
| &nbsp;&nbsp; LTIP | Long-Term Incentive Plan |
| &nbsp;&nbsp; Meridian | Meridian Compensation Partners |
| &nbsp;&nbsp; NEO | Named Executive Officer |
| &nbsp;&nbsp; NYSE | New York Stock Exchange |
| &nbsp;&nbsp; PSU | Performance Share Unit |
| &nbsp;&nbsp; PvP | Pay vs. Performance |
| &nbsp;&nbsp; RSU | Restricted Stock Unit |
| &nbsp;&nbsp; SEC | Securities and Exchange Commission |
| &nbsp;&nbsp; SERP | Supplemental Executive Retirement Plan |
| &nbsp;&nbsp; SVP | Senior Vice President |
| &nbsp;&nbsp; TSR | Total Shareholder Return |
| &nbsp;&nbsp; VP | Vice President |
| &nbsp;&nbsp; WTW | Willis Towers Watson |

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PROXY SUMMARY

## PROXY SUMMARY
Governance Highlights

Our Company is committed to maintaining the highest standards of corporate governance. Strong corporate governance practices help us achieve our performance goals and maintain the trust and confidence of our investors, employees, customers, regulatory agencies and other stakeholders. Our corporate governance practices are described in more detail in Corporate Governance Matters in this proxy statement and in our Corporate Governance Guidelines, which can be found in the Corporate Governance section of our website at https://investor.avistacorp.com/corporate-governance.

DIRECTOR INDEPENDENCE

• The President and Chief Executive Officer ("CEO") is the only non-independent director.

• During 2025, the Board committees (except the Executive Committee) were composed exclusively of independent directors.

• The Board is committed to board refreshment. Our Board added four new members in the past five years, three of whom are independent.

• The independent directors regularly meet in executive sessions without management.

![LOGO](g853530g35c04.jpg)

BOARD LEADERSHIP

• The positions of Chair and CEO are separated.

• The Company has an independent Vice Chair, appointed by the Board, whose duties are equivalent to those of a lead independent director.

• The Vice Chair, in collaboration with the Chair, helps facilitate and ensure there is open and effective communication between the Board, the Chair and management. The Vice Chair's specific duties are set forth in Corporate Governance Matters.

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| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 100%<br>ALL DIRECTOR<br>NOMINEES EXHIBIT: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • High Integrity<br>• A Commitment to Sustainability<br>• Knowledge of Corporate Governance<br>Requirements and Practices<br>• Leadership Experience<br>| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • A Commitment to the Long-Term<br>Interests of our Shareholders<br>• Strong Business Judgment<br>• A Proven Record of Success<br>• Innovative Thinking<br>|

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 1 |

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PROXY SUMMARY

BOARD OVERSIGHT OF RISK MANAGEMENT

• The Board and its committees consider enterprise risk in connection with all Company operations including, but not limited to, utility regulatory, operational, climate change, cybersecurity, technology, strategic, external mandates, financial, energy commodity and compliance risks.

• The Board reviews Avista's systematic approach to identifying, assessing and managing risks faced by the Company.

STOCK OWNERSHIP REQUIREMENTS

• Independent directors are expected to achieve a minimum investment of five times the minimum equity portion of their retainer in Company common stock and are expected to retain at least that level of investment during their tenure on the Board.

• Directors and officers are prohibited from engaging in short sales, pledging, or hedging the economic interest in their Company shares.

• The stock ownership policy for the Company's executive officers requires executive officers to own shares based on their highest position and salary:

• President and Chief Executive Officer — 5 times salary

• Senior Vice Presidents ("SVP") — 2.5 times salary

• Vice Presidents ("VP") — 1 times salary

BOARD PRACTICES

• The Board regularly assesses its performance through Board, committee, committee chair, and individual director evaluations.

• Continuing director education is provided during regular Board and committee meetings, including education by outside experts, and by supporting attendance at outside programs.

• Directors may not stand for election after age 75.

• The Governance and Corporate Responsibility Committee ("Governance Committee") leads the full Board in considering Board competencies and refreshment in light of Company strategy.

• The Board is committed to actively seeking out highly qualified candidates and including such individuals in each Board candidate pool, including candidates with a diversity of experience, skills, background and viewpoint.

ACCOUNTABILITY

• The Board proactively adopted Proxy Access for director nominees.

• All directors stand for election annually.

• In uncontested elections, directors must be elected by a majority of votes cast.

Shareholder Engagement

The Company has a history of engaging with our shareholders, supporting our belief in the importance of the governance process and of incorporating a meaningful understanding of shareholder perspectives on corporate governance, executive compensation, and other issues that are important to them. These discussions help to inform our Board's approach to governance, compensation and oversight of corporate responsibility initiatives. Our Office of the Corporate Secretary coordinates shareholder engagement with Investor Relations and provides a summary of all relevant feedback to the Board. In addition, Investor Relations meets with our shareholders throughout the year, frequently along with our CFO and CEO.

Corporate Responsibility: Building Trust and Accountability

The Company understands its commitment to sustainability, stewardship and corporate citizenship is important, not only to our shareholders, but to our communities and other constituencies. Accordingly, we have produced a Corporate Responsibility Report

2. **AVISTA CORPORATION** • **2026 PROXY STATEMENT**

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PROXY SUMMARY

covering the Company's commitments to the environment, its employees, its customers and the communities we serve, as well as ethical governance. This report is available on our website at https://investor.avistacorp.com/corporate-responsibility/our-commitment. Material on our website, including but not limited to this report and related reports and metrics, is neither part of nor intended to be incorporated into this Proxy Statement.

Compensation Highlights

In 2025, the Compensation and Organization Committee ("Compensation Committee") established performance goals for the Company based on input from the CEO and aligned the short-term and long-term incentive plans with those goals. Our incentive arrangements allow us to focus on maintaining an attractive financial profile while creating long-term value for shareholders and customers.

As summarized below, the compensation earned by our Named Executive Officers ("NEOs") in 2025 reflects our corporate performance for the fiscal year.

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|:---|:---|:---|:---|
| OUR ANNUAL<br> CASH INCENTIVE<br> 114%<br>2025 PAYOUT | OUR CUMULATIVE<br> EARNINGS PER SHARE<br> PERFORMANCE SHARES<br> 40%<br>2025 PAYOUT | OUR TOTAL<br> SHAREHOLDER RETURN<br> PERFORMANCE SHARES<br> 0%<br>2025 PAYOUT | OUR CEO'S<br> PAY WAS<br> 62%<br>LINKED TO SHARE<br> VALUE IN 2025 |

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HIGHLIGHTS

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| &nbsp;&nbsp;&nbsp; ![LOGO](g853530g00t38.jpg)  | The Compensation Committee **approved base salary adjustments of 55% for our newly appointed CEO, and adjustments ranging from 3% to 8%** for our other NEOs. These determinations were based upon competitive market analyses, evaluations of individual performance, and other considerations, as further detailed in the Compensation Discussion and Analysis section. |
| &nbsp;&nbsp;&nbsp; ![LOGO](g853530g00t38.jpg)  | In early 2026, our NEOs received a **payout for one-third of their restricted stock units** ("RSUs") granted in each of 2023, 2024 and 2025, along with the associated dividend equivalents. These RSUs are time-based, and one-third vest each year over a three-year period. |
| &nbsp;&nbsp;&nbsp; ![LOGO](g853530g00t38.jpg)  | Our **Cumulative Earnings Per Share ("CEPS")** landed at our three-year CEPS threshold, which resulted in payment of **40% of the performance share units ("PSUs") related to CEPS** granted in 2023 for the 2023-2025 performance period and the associated dividend equivalents. |

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| &nbsp;&nbsp;&nbsp; ![LOGO](g853530g00t38.jpg)  | Utility Earnings Per Share, O&M Cost per Customer, Customer Satisfaction, Reliability, Average Response Time, and Strategy Scorecard metrics performed near or above target for our Short-Term Incentive Plan, resulting in a **total annual cash incentive payment of 114% of target.** |
| &nbsp;&nbsp;&nbsp; ![LOGO](g853530g00t38.jpg)  | Our **Total Shareholder Return ("TSR")** was below threshold for our Long-Term Incentive Plan, which resulted in **no payout of the PSUs related to TSR** granted in 2023 for the 2023-2025 performance period and no associated dividend equivalents. |
| &nbsp;&nbsp;&nbsp; ![LOGO](g853530g00t38.jpg)  | **Our CEO compensation strongly aligns with our shareholder interests:** 62% in long-term incentive equity, 19% in annual cash incentive, and 19% base salary. |
| &nbsp;&nbsp;&nbsp; ![LOGO](g853530g00t38.jpg)  | **Our CEO's pay is 23 times higher** than our median employee's pay. |

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 3.0 |

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PROPOSAL 1: ELECTION OF DIRECTORS

## Proposal 1

## ELECTION OF DIRECTORS
What are you voting on?

We are asking our shareholders to elect director nominees for a one-year term. This section includes information about the Board of Directors and each director nominee.

Voting Recommendation:

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| <br> ![LOGO](g853530g62i37.jpg)  | <br> THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE "FOR" EACH OF THE NOMINEES FOR DIRECTOR AND URGES BENEFICIAL OWNERS, IF THEY ARE NOT THE RECORD HOLDERS, TO INSTRUCT THEIR BROKERS OR OTHER NOMINEES TO VOTE FOR EACH DIRECTOR. |

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| Director Selection Process<br>The Board is elected by the shareholders to oversee their interests in the long-term overall success of the Company's business and its financial strength. Our directors have diverse backgrounds and experience and represent a broad spectrum of viewpoints.<br>The Board has a robust and effective director nomination and evaluation process. The Board has delegated to the Governance Committee the responsibility for reviewing and recommending to the Board nominees for director. The Governance Committee annually reviews with the Board the composition of the Board as a whole and recommends, if necessary, steps to be taken so the Board reflects the appropriate balance of knowledge, experience, competencies and expertise, all in the context of an assessment of the needs of the Board and the Company at the time. In evaluating a director candidate, the Governance Committee considers the knowledge, experience, integrity, business acumen and judgment of that candidate; the potential contribution of that candidate to the diversity of backgrounds, experience and competencies the Board desires to have represented; the willingness of that candidate to consider strategic proposals; and any other criteria established by the Board, as well as any core competencies or technical expertise necessary to staff the Board committees. | Director Selection Process<br>The Board is elected by the shareholders to oversee their interests in the long-term overall success of the Company's business and its financial strength. Our directors have diverse backgrounds and experience and represent a broad spectrum of viewpoints.<br>The Board has a robust and effective director nomination and evaluation process. The Board has delegated to the Governance Committee the responsibility for reviewing and recommending to the Board nominees for director. The Governance Committee annually reviews with the Board the composition of the Board as a whole and recommends, if necessary, steps to be taken so the Board reflects the appropriate balance of knowledge, experience, competencies and expertise, all in the context of an assessment of the needs of the Board and the Company at the time. In evaluating a director candidate, the Governance Committee considers the knowledge, experience, integrity, business acumen and judgment of that candidate; the potential contribution of that candidate to the diversity of backgrounds, experience and competencies the Board desires to have represented; the willingness of that candidate to consider strategic proposals; and any other criteria established by the Board, as well as any core competencies or technical expertise necessary to staff the Board committees. | ![LOGO](g853530g07k02.jpg) |
| GENDER DIVERSITY | ETHNIC/RACIAL DIVERSITY | ![LOGO](g853530g07k02.jpg) |
| ![LOGO](g853530g07k03.jpg) | ![LOGO](g853530g07k04.jpg) | ![LOGO](g853530g07k02.jpg) |

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4. **AVISTA CORPORATION** • **2026 PROXY STATEMENT**

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For longer-serving directors, the Governance Committee also considers the tenure of the director and whether the duration of service impairs such director's independence from management, as demonstrated by the director's relationship with management and the director's participation in Board and committee deliberations. Directors must be able to commit the requisite time for preparation and attendance at regularly scheduled Board and committee meetings, as well as be able to participate in other matters necessary to ensure good corporate governance is practiced.

The Board is committed to actively seeking out highly qualified candidates and including such individuals in each Board candidate pool, including candidates with a diversity of experience, skills, background, and viewpoint.

The Board considers the appropriate size of the Board and the needs of the Company with respect to the particular talents and experience of its directors. In evaluating individual director candidates, the Board takes into consideration the criteria set forth in the Company's Corporate Governance Guidelines (available on the Company's website at *https://investor.avistacorp.com/corporate-governance*), including, but not limited to:

• The qualifications, knowledge, competencies, abilities and executive leadership experience of nominees, as well as work experience at the executive leadership level in his/her field of expertise;

• Familiarity with the energy/utility industry;

• Recognition by other leaders as a person of integrity and outstanding professional competence with a proven record of accomplishments;

• Experience in a regulatory arena;

• Knowledge of the business of, and/or facilities for, the generation, purchase, transmission and/or distribution of electric energy and/or the purchase, storage and/or distribution of natural gas;

• Attributes enhancing the diversity and perspective of the Board; and

• Knowledge of the customers, community and employee base.

The Board believes it must continue to refresh itself. During the last five years, the Board added four new members, three of whom are independent, as a result of retirements and departures due to professional and personal commitments. The Board consists of directors with a range of experience at policy-making levels in business, government and other areas relevant to the Company's activities. The average tenure of the current director nominees is 9.9 years and the average age is 61.3.

The Governance Committee identifies nominees by first evaluating the current members of the Board. Current members of the Board with competencies and experience relevant to the Company's business strategies and who are willing to continue in service are considered for re-nomination. If any member of the Board does not wish to continue in service, or if the Governance Committee decides not to nominate a member for re-election, the Committee would then identify the desired qualifications, competencies, expertise, diversity, abilities and experience of a new nominee considering the criteria set forth above. Current members of the Board are polled for recommendations of individuals meeting the criteria described above. The Governance Committee may also consider candidates recommended by management, employees or others. The Governance Committee may, at its discretion, engage executive search firms to identify qualified individuals.

Shareholder Recommendations and Nominations of Director Candidates; Proxy Access

The Governance Committee will consider written recommendations for candidates for the Board made by shareholders. Recommendations must include detailed biographical material indicating the qualifications of the candidate for the Board and must include a written statement from the candidate of willingness and availability to serve. The Governance Committee will consider any candidate recommended in good faith by a shareholder. The Governance Committee will evaluate director nominees in the same manner as other candidates are evaluated, as discussed above.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 5.0 |

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While candidates for director are usually nominated by the Board (after consideration and recommendation by the Governance Committee, as discussed above), shareholders may directly nominate candidates for election as directors. In order to do so, shareholders must follow the procedures set forth in the Company's Bylaws ("Bylaws"), described in the section "2027 Annual Meeting Information." The Chair of the meeting may refuse to acknowledge any nomination not made in compliance with the Bylaws.

In addition, subject to the satisfaction of additional requirements and conditions, and to the exceptions and limitations set forth in the Bylaws, each registered shareholder (or group of not more than 20 shareholders) who has owned at least 3% of the Company's outstanding shares of common stock for at least three years, may designate one nominee for election as a director of the Company for inclusion in management's proxy soliciting materials for each Annual Meeting of Shareholders; provided, however, that management is not required to include a number of such designees greater than 20% of the total number of members of the Board of Directors; and provided, further, the designating shareholder(s) and the designated nominee(s) shall also meet the eligibility and other requirements set forth in the Bylaws and described in "2027 Annual Meeting Information".

Current Nominees

Eleven directors are to be elected to hold office for a one-year term, and until a qualified successor is elected. The Company's Restated Articles of Incorporation and Bylaws provide for up to 11 directors, as specified from time to time by the Board. The Board has fixed the number of directors at 11.

Upon recommendation from the Governance Committee, the Board nominated Julie A. Bentz, Donald C. Burke, Kevin B. Jacobsen, Rebecca A. Klein, Sena M. Kwawu, Scott H. Maw, Scott L. Morris, Jeffry L. Philipps, Heather L. Rosentrater, Heidi B. Stanley, and Janet D. Widmann to be re-elected as directors for a one-year term to expire at the Annual Meeting in 2027 and until their successors shall have been elected. The nominees have consented to serve as directors, and the Board has no reason to believe any nominee will be unable to serve. If a nominee should become unavailable, your shares will be voted for a Board-approved substitute. The Board concluded all nominees, with the exception of Ms. Rosentrater, are independent, and all nominees satisfy the various criteria for nomination as directors.

Included in each nominee's biography is an assessment of the specific qualifications, competencies, attributes and experience of such nominee based on the qualifications described above.

6. **AVISTA CORPORATION** • **2026 PROXY STATEMENT**

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Summary of Board Core Competencies

Our director nominees bring a balance of relevant skills to the boardroom, as well as an effective mix of diversity and experience. A summary of the director nominees' core competencies is shown below:

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|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Qualifications and Expertise | ![LOGO](g853530g60y60.jpg) | ![LOGO](g853530g60y61.jpg) | ![LOGO](g853530g60y62.jpg) | ![LOGO](g853530g60y63.jpg) | ![LOGO](g853530g60y64.jpg) | ![LOGO](g853530g60y65.jpg) | ![LOGO](g853530g60y66.jpg) | ![LOGO](g853530g60y67.jpg) | ![LOGO](g853530g60y68.jpg) | ![LOGO](g853530g60y69.jpg) | ![LOGO](g853530g60y70.jpg) | Total |
| FINANCIAL<br> Leadership of a financial firm or management of the finance function of an enterprise, resulting in proficiency in complex financial management, capital allocation, and financial reporting processes. |  | ● | ● |  | ● | ● | ● | ● |  | ● | ● | 8/11 |
| LEADERSHIP<br> Extended experience leading a significant enterprise, resulting in a practical understanding of organizations, processes, strategic planning, and risk management. Demonstrated strengths in developing talent, planning succession, and driving change and long-term growth. | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | 11/11 |
| BUSINESS INNOVATION<br> Experience driving business success, with an understanding of diverse business environments including regional considerations, economic conditions, cultures, and regulatory frameworks, as well as disruptive innovation. | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | 11/11 |
| ENERGY AND UTILITIES<br> Experience with the unique operating, regulatory, and financial aspects of the utility industry and related risks, including energy and commodity markets. |  |  |  | ● |  |  | ● |  | ● |  |  | 3/11 |
| TECHNOLOGY<br> Experience working in operating and administrative technology, including expertise in cybersecurity. | ● |  |  | ● | ● |  | ● |  | ● |  | ● | 6/11 |
| REGULATORY, ENVIRONMENTAL AND RISK<br> Experience with and an understanding of the regulated nature of the utility industry, including environmental regulation, the clean energy transition, and oversight of risk. | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | 11/11 |
| MERGERS AND ACQUISITIONS<br> The ability to analyze the fit of a company's strategy and culture, accurately value transactions, and evaluate operational integration plans. |  | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | 10/11 |

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|:---|:---|:---|
| 100%<br>OF OUR DIRECTORS PARTICIPATE IN BOARD GOVERNANCE | 91%<br>OF OUR DIRECTORS ARE INDEPENDENT | 36%<br>OF OUR DIRECTORS WERE ADDED IN THE LAST 5 YEARS |

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 7.0 |

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Except as otherwise indicated, committee membership is as of the date of this proxy statement.

![LOGO](g853530g09m09.jpg)

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| INDEPENDENT DIRECTOR NOMINEE<br>Age: 61<br>Tenure: 4 Years<br>COMMITTEES<br>• Environmental, Technology, Operations<br>• Finance<br>BOARD AND PHILANTHROPIC SERVICE<br>• Chair, External Advisory Board for National Security Programs, Sandia National Laboratory<br>• Chair, External Review Committee for Strategic Deterrence, Lawrence Livermore National Laboratory<br>• Board Member, External Review Committee for Global Security, Lawrence Livermore National Laboratory<br>• Advisor on Policy and Safety for 1st American Nuclear Co. (FANCO)<br>• Member, College of Engineering Dean's Leadership Council, Oregon State University<br>• Former Member, CACI Strategic Advisory Group | JULIE A.<br> BENTZ<br>MAJOR GENERAL (RETIRED) BENTZ is one of the principals of BDR LLC, a tree farm and fish hatchery management company, and the sole principal of HOMR LLC, a national security and leadership consulting firm. She retired in 2019 after a successful 33-year career spanning active, reserve and National Guard commissioned service. She has been a recurring member of the White House National Security Council Staff and Homeland Security Council for the Executive Office of the President. While working at the White House, her roles included Senior Advisor for Emerging Technologies and Director of Strategic Capabilities. She also held numerous roles in the Department of Defense at the Pentagon.<br>Major General (Retired) Bentz holds an M.S. in National Security Strategy from the National Defense University, a Ph.D. and M.S. in Nuclear Engineering from the University of Missouri, and a B.A. in Radiological Health from Oregon State University.<br>REASONS FOR NOMINATION<br>Ms. Bentz brings to the Board an extensive background in technology and security, both physical and cyber, as well as unique experience serving under three separate United States Presidents on security-related policy matters. Through her service on both the Finance Committee and the Environmental, Technology and Operations Committee, Ms. Bentz provides a unique and valuable perspective on a wide range of issues, including financial matters and investments, as well as issues involving climate change and clean energy transition, technology, and operational safety and security.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Technology<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>|

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8. **AVISTA CORPORATION** • **2026 PROXY STATEMENT**

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![LOGO](g853530g01h02.jpg)

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| INDEPENDENT DIRECTOR NOMINEE<br>Age: 65<br>Tenure: 14 Years<br>COMMITTEES<br>• Vice Chair of the Board<br>• Audit (Chair)<br>• Executive<br>• Governance<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member and Audit Committee Chair, Virtus mutual fund complex<br>• Board Member and Audit Committee Chair, Duff & Phelps mutual fund complex<br>• Former Board Member, Goldman Sachs mutual fund complex<br>• Former Board Member, BlackRock global funds<br>• Former Board Member and Treasurer, Crohn's and Colitis Foundation | DONALD C.<br> BURKE<br>MR. BURKE was a managing director of BlackRock, Inc and served as the president and CEO of the BlackRock US mutual funds until his retirement in 2009. In this role, Mr. Burke was responsible for the accounting, tax and regulatory reporting requirements for over 300 open and closed-end mutual funds. Mr. Burke joined BlackRock in connection with the merger with Merrill Lynch Investment Managers ("MLIM"), taking a lead role in the integration of the two firms' operating infrastructures. While at MLIM, Mr. Burke was the Head of Global Operations and Client Services and also served as the Treasurer and CFO of the MLIM mutual funds. He started his career in public accounting.<br>Mr. Burke is a certified public accountant and received a B.S. in Accounting and Economics from the University of Delaware and an M.B.A. in Taxation from Pace University.<br>REASONS FOR NOMINATION<br>Mr. Burke brings significant financial and accounting experience to the Board from his years in public accounting and his role as the treasurer and CFO of numerous mutual funds. Through his service as Chair of the Audit Committee and as the designated Audit Committee Financial Expert, Mr. Burke's background enhances his performance of a critical leadership role in overseeing the integrity of the Company's financial statements and related controls, compliance with legal and regulatory requirements, and the performance of the Company's internal audit function and independent auditors. In addition, as a member of the Governance Committee, Mr. Burke provides a unique and valuable perspective on the Company's corporate governance and corporate responsibility programs and activities. As a result of his demonstrated excellence in helping lead the Board, Mr. Burke was selected to serve as Vice Chair of the Board in 2023.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 9.0 |

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![LOGO](g853530g13m13.jpg)

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| INDEPENDENT DIRECTOR NOMINEE<br>Age: 59<br>Tenure: 3 Years<br>COMMITTEES<br>• Audit<br>• Environmental, Technology, Operations<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member, Blue Shield of California<br>• Former Member of the Economic Advisory Council, Federal Reserve Bank of San Francisco | KEVIN B.<br> JACOBSEN<br>MR. JACOBSEN was previously the Chief Financial Officer of The Clorox Company (NYSE: CLX), a role he held from 2018 through April 2025. As CFO, Mr. Jacobsen was the senior executive responsible for Clorox's financial activities, including general accounting, external reporting, financial planning, treasury, tax, and investor relations, as well as oversight of the company's internal audit function. From 2011 until his appointment as CFO, Mr. Jacobsen served as vice president of financial planning and analysis for Clorox. Prior to that, he served in various roles for Clorox, including as vice president of finance, business development and international; vice president of finance, specialty division; and finance management positions for the Kingsford, Cat Litter and Brazil businesses and the product supply organizations of Clorox. He started his career with Clorox in 1995 after spending five years with General Motors Corporation (NYSE:GM) in various finance and accounting roles.<br>REASONS FOR NOMINATION<br>Mr. Jacobsen brings a deep knowledge of financial and accounting issues to the Board, as well as experience as an executive of a publicly traded company operating in competitive product markets. Mr. Jacobsen's background and experience will enable him to provide a unique and valuable perspective on the Company's business and operational risks through his anticipated service on the Environmental, Technology and Operations Committee. In addition, given his broad financial background, Mr. Jacobsen will be a valuable member of the Board's Audit Committee, where he will provide important oversight over the integrity of the Company's financial statements and related controls, compliance with legal and regulatory requirements, and the performance of the Company's internal audit function and independent auditors.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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10. **AVISTA CORPORATION** • **2026 PROXY STATEMENT**

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![LOGO](g853530g66k58.jpg)

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| INDEPENDENT DIRECTOR NOMINEE<br>Age: 60<br>Tenure: 16 Years<br>COMMITTEES<br>• Compensation<br>• Environmental, Technology, Operations (Chair)<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member, Diamondback Energy, an upstream oil and gas company<br>• Board Member, H2O America, a California water utility with national subsidiaries<br>• Founder and Board Member, Texas Energy Poverty Research Institute<br>• Board and Faculty Member, Christian Latina Leadership Institute | REBECCA A.<br> KLEIN<br>MS. KLEIN is the principal of Klein Energy, LLC, an energy consulting company based in Austin, Texas. Over the last 25 years, she has worked in Washington, DC and in Texas in the energy, telecommunications and national security arenas. Ms. Klein's professional experience includes service with KPMG Consulting (now Deloitte) where she headed the development of the company's Office of Government Affairs and Industry Relations in Washington, DC. She has served as a commissioner and chair of the Texas Public Utilities Commission and as a Senior Fellow with Georgetown University's McDonough School of Business. She is a retired Lieutenant Colonel of the Air Force Reserve and a member of the State Bar of Texas.<br>Ms. Klein holds a B.A. in Human Biology from Stanford University, an M.B.A. from MIT, an M.A. in National Securities Studies from Georgetown University, and a J.D. from St. Mary's University School of Law in San Antonio, Texas.<br>REASONS FOR NOMINATION<br>Ms. Klein possesses a deep knowledge of the energy industry, energy markets and energy regulation, as well as legal expertise in energy and telecommunications and experience in technology and cybersecurity issues. She provides a unique diversity of background and perspective to the Board generally, but particularly in her role as chair of the Environmental, Technology & Operations Committee, Ms. Klein is able to provide critical leadership around the Company's business and operational risks, environmental activities and objectives, and its strategies relating to physical and cyber security, technology, and data governance. As a member of the Compensation Committee, Ms. Klein helps provide oversight on executive compensation matters, as well as the Company's strategies, objectives and performance relating to human capital management, including diversity, equity, and inclusion.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Energy and Utilities<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Technology<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 11.0 |

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![LOGO](g853530g01h03.jpg)

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|:---|:---|
| INDEPENDENT DIRECTOR NOMINEE<br>Age: 57<br>Tenure: 5 Years<br>COMMITTEES<br>• Environmental, Technology, Operations<br>• Finance (Chair)<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Chair, VillageReach<br>• Board Member, The Executive Leadership Council | SENA M.<br> KWAWU<br>MR. KWAWU is an operationally focused senior executive with 30+ years of experience in high growth and mature public and private companies across multiple industries. He currently serves as President, In-Home Services at Cinch Home Services, Inc., a home services company with flexible home service (warranty) plans sold through multiple partner channels. Prior to this role, Mr. Kwawu served as the senior vice president of operations of Frontdoor, Inc. (NASDAQ: FTDR), the largest home services (warranty) company in the US. Prior to joining Frontdoor, Mr. Kwawu was with Starbucks Corporation (NASDAQ: SBUX), where he was the senior vice president of finance and business operations. He joined Starbucks as the senior vice president of global supply chain finance. His career also includes global leadership roles with State Street Corporation (NYSE: STT), Genworth Financial (NYSE: GNW) and General Electric Company (NYSE: GE).<br>Mr. Kwawu holds a B.B.A. from George Washington University and an M.B.A. from University of Michigan.<br>Mr. Kwawu is the board chair for VillageReach, a non-profit global health innovator developing new solutions to critical healthcare challenges in low- and middle-income countries, mostly on the African continent.<br>REASONS FOR NOMINATION<br>Mr. Kwawu has extensive background as a public company executive, which includes experience with risk management, supply chain management, finance, banking, mergers and acquisitions, technology and customer service. Mr. Kwawu's background allows him to bring a diversity of perspective to Board-related matters. Mr. Kwawu's experience with operational, supply chain and technology issues allow him to provide unique insights and perspective to his service on the Company's Environmental, Technology & Operations Committee, which oversees the business and operational risks of the Company, the Company's environmental performance and strategy, employee and public safety, supply chain risk, and physical and cyber security, technology and data management. Likewise, through his service on the Finance Committee, Mr. Kwawu is able to bring his extensive financial background to bear in helping ensure proper oversight of the Company's strategies, budgets, forecasts and financial plans and programs to enable the Company to meet its short- and long-term goals and objectives.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Technology<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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12. **AVISTA CORPORATION** • **2026 PROXY STATEMENT**

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##### [**Table of Contents**](#toc)
PROPOSAL 1: ELECTION OF DIRECTORS

![LOGO](g853530g19v19.jpg)

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| | |
|:---|:---|
| INDEPENDENT DIRECTOR NOMINEE<br>Age: 58<br>Tenure: 9 Years<br>COMMITTEES<br>• Compensation (Chair)<br>• Governance<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member, Board of Trustees, Gonzaga University<br>• Board Member and Audit Committee Chair, Alcon, Inc. (NYSE: ALC), a Swiss medical company specializing in eye care products<br>• Board Chair, Chipotle Mexican Grill, Inc. (NYSE: CMG) | SCOTT H.<br> MAW<br>MR. MAW served as executive vice president and CFO of Starbucks Corporation (NASDAQ: SBUX) from February 2014 until his retirement in November 2018. In that capacity, Mr. Maw was responsible for the company's Global Finance organization. Prior to that, he served as senior vice president of Corporate Finance of Starbucks where he was responsible for corporate finance, including accounting, tax and treasury. Mr. Maw also had oversight of all financial and securities-related regulatory filings. He joined Starbucks as global controller in 2011.<br>Prior to joining Starbucks, Mr. Maw served as CFO of SeaBright Insurance Company, a specialty workers' compensation insurer, from 2010 to 2011. From 2008 to 2010, he served as CFO of the Consumer Banking division of JPMorgan Chase & Co. (NYSE: JPM), having previously held a similar position at Washington Mutual Bank. From 1994 to 2003, he served in various finance leadership positions at General Electric Company, including serving as CFO of GE Insurance Holdings, Inc. in London.<br>Mr. Maw graduated from Gonzaga University with a B.A. in Accounting.<br>REASONS FOR NOMINATION<br>Mr. Maw brings more than 30 years of financial experience, including extensive experience as a senior executive of several public companies and deep expertise on financial matters and global business operations, to his service on the Board. Mr. Maw provides critical leadership to the Board through his role as Chair of the Compensation Committee, through which he helps ensure proper executive compensation practices and philosophies, provides oversight over the organizational structure and executive personnel of the Company, and helps ensure proper oversight of the Company's strategies, objectives and performance relating to human capital management, including diversity, equity and inclusion. Likewise, Mr. Maw's extensive executive experience allows him to bring a unique and valuable perspective to his service on the Board's Governance Committee, as well as to the Company's disclosure of corporate responsibility matters, including environmental, social and governance issues.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 13.0 |

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##### [**Table of Contents**](#toc)
PROPOSAL 1: ELECTION OF DIRECTORS

![LOGO](g853530g01h04.jpg)

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| | |
|:---|:---|
| INDEPENDENT DIRECTOR NOMINEE<br>Age: 68<br>Tenure: 19 Years<br>COMMITTEES<br>• Chair of the Board<br>• Executive (Chair)<br>• Finance<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member, McKinstry Co., LLC, a building systems design, operation and maintenance company<br>• Lead Director, California Water Service, the largest regulated American water utility west of the Mississippi River and the third largest in the country<br>• Trustee Emeritus, Gonzaga University<br>• Board Member, Bite to Go, a program of Second Harvest<br>• Former Board Member, various Spokane nonprofit and economic development Boards | SCOTT L.<br> MORRIS<br>MR. MORRIS has been Chair of the Company since January 2008. From January 2008 to October 1, 2019, he also served as the Company's CEO. From January 2008 to January 2018, he served as the Company's President. From May 2006 to December 2007, he served as the Company's President and Chief Operating Officer ("COO"). Mr. Morris was hired by the Company in 1981 and his experience includes management positions in construction and customer service, as well as management of the Company's Oregon utility business. He was elected as a vice president in November 2000 and, in February 2002, he was elected as a senior vice president.<br>Mr. Morris is a graduate of Gonzaga University and received his M.A. in organizational leadership from Gonzaga. He also completed the Stanford Business School Financial Management Program and the Kidder Peabody School of Financial Management.<br>REASONS FOR NOMINATION<br>Mr. Morris, in his position as Chair of the Board, leads the overall activities of the Board. He has extensive utility experience, having spent his entire career in the industry. He brings a deep knowledge and understanding of the Company and its subsidiaries, as well as the Company's overall strategies, activities and objectives, including those relating to operational performance; environmental, social and governance issues; clean energy; employee development, retention and attraction; financial performance; and ethical corporate governance. Through his service on the Finance Committee, Mr. Morris helps ensure adequate oversight of the Company's financial strategies, budgets, forecasts and financial plans and programs to enable the Company to meet its short- and long-term goals and objectives. Mr. Morris also delivers keen insight into the economic, political and cultural characteristics of the Company's service territories and the Pacific Northwest as a whole.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Energy and Utilities<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Technology<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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14. **AVISTA CORPORATION** • **2026 PROXY STATEMENT**

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##### [**Table of Contents**](#toc)
PROPOSAL 1: ELECTION OF DIRECTORS

![LOGO](g853530g01h05.jpg)

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| | |
|:---|:---|
| INDEPENDENT DIRECTOR NOMINEE<br>Age: 70<br>Tenure: 6 Years<br>COMMITTEES<br>• Audit<br>• Compensation<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member, Innovia Foundation<br>• Board Member, Comma Community Journalism Lab<br>• Former Board Chair of Life Sciences Spokane, a GSI initiative to develop and support a life and bioscience economy in Spokane, Washington<br>• Former Board Member, Inland NW Council of the Boy Scouts of America<br>• Former Community Advisory Board Member, University of Washington and Gonzaga University Regional Health Partnership<br>• Former Board Chair, Washington Food Industry Association<br>• Former Campaign Chair, United Way of Spokane County Campaigns<br>• Former Board Chair, Greater Spokane Incorporated (GSI)<br>• Former Board Chair, Providence Community Mission Board<br>• Former Community Advisory Board Member, Washington State University Elson S. Floyd College of Medicine | JEFFRY L.<br> PHILIPPS<br>MR. PHILIPPS was President and CEO of Rosauers Supermarkets, Inc. from July 2000 until his retirement in August 2021, during which time he oversaw the strategy and all operations of a retail grocery company operating 22 retail stores across the Pacific Northwest. Over the span of his career, Mr. Philipps has also played an integral role in the economic vitality of the greater Spokane area and Inland Pacific Northwest region through his leadership roles in a multitude of different regional and national organizations and entities. Mr. Philipps is a member of the Public Library Foundation Citizen Hall of Fame and was named "Retailer of the Year" twice by the Washington Food Industry Association.<br>Mr. Philipps is a graduate of Carroll College in Helena, Montana, where he earned B.A. degrees in Business, Economics and Accounting.<br>REASONS FOR NOMINATION<br>Mr. Philipps brings a long history of leadership, economic development, and innovation to the Board, including more than 20 years of experience as the CEO of a retail grocery company and a background in accounting and finance, mergers and acquisitions, supply chain, organizational development, human resources, economic development, political and regulatory affairs, and consumer retail sales. His extensive background in these areas make him a valuable member of the Compensation Committee of the Board, through which he helps ensure proper alignment of executive compensation and structure, as well as oversight of human capital management and diversity, equity and inclusion issues. Likewise, through his past service on the Finance Committee, and now the Audit Committee, Mr. Philipps brings his unique and valuable leadership and background to bear in helping provide oversight of the Company's financial strategies and objectives.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 15.0 |

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##### [**Table of Contents**](#toc)
PROPOSAL 1: ELECTION OF DIRECTORS

![LOGO](g853530g25v25.jpg)

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|:---|:---|
| NON-INDEPENDENT DIRECTOR NOMINEE<br>Age: 48<br>Tenure: 1 Year<br>COMMITTEES<br>• Executive<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member, American Gas Association (AGA)<br>• Board Member, Edison Electric Institute (EEI)<br>• Board Member, Western Energy Institute (WEI)<br>• Board Member, Washington Roundtable<br>• Board Member, Avista Foundation<br>• Board Member, Second Harvest Inland Northwest<br>• Former Board Member, Urbanova<br>• Former Member, Gonzaga University School of Engineering and Applied Science Executive Council<br>• Former Board Member, YWCA Spokane<br>• Former Board Member, Vanessa Behan Crisis Nursery | HEATHER L.<br> ROSENTRATER<br>MS. ROSENTRATER has been President and CEO of the Company since January 1, 2025. As CEO, Ms. Rosentrater oversees all aspects of the Company's business and its strategies. Previously, Ms. Rosentrater served as President and Chief Operating Officer (from October 2023); Senior Vice President and Chief Operating Officer (from September 2022); and Vice President of Energy Delivery (from November 2015). Ms. Rosentrater also serves as the chair of the board of Avista's subsidiary Alaska Electric Light and Power Company.<br>Ms. Rosentrater joined Avista in 1996 as a student engineering technician for Avista Labs, a fuel cell subsidiary business that was later sold. She joined Avista Corporation as an electrical engineer in 1999 and, since 2006, has served in leadership roles across Avista's electric and natural gas businesses.<br>Ms. Rosentrater is a graduate of Gonzaga University with a B.S. in Electrical Engineering.<br>REASONS FOR NOMINATION<br>Ms. Rosentrater brings extensive utility experience to her position on the Board, spending more than 25 years with the Company and its subsidiaries. Throughout, she has served as a thought leader, both within the Company and throughout the industry, on a wide range of issues, including decarbonization, grid resiliency, wildfire mitigation, employee development, safety and security, operational excellence, ethical corporate governance, and financial performance. She has likewise provided critical leadership to the Company in the development of its short- and long-term strategies and helped to position the Company to successfully execute those strategies going forward. Ms. Rosentrater has deep roots in the Pacific Northwest, giving her a unique understanding of the Company's history and the role it plays in the communities it serves, as well as a deep appreciation of its customer base and the economic and political issues that shape its service territory.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Energy and Utilities<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Technology<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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|:---|:---|
| 16.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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##### [**Table of Contents**](#toc)
PROPOSAL 1: ELECTION OF DIRECTORS

![LOGO](g853530g01h06.jpg)

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|:---|:---|
| INDEPENDENT DIRECTOR NOMINEE<br>Age: 69<br>Tenure: 20 Years<br>COMMITTEES<br>• Audit<br>• Executive<br>• Governance<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member, Forterra, Inc., a for-profit, wholly-owned subsidiary of the Association of Washington Business<br>• Founding Member, Greater Spokane Incorporated<br>• Board Member, various other charitable, educational and cultural organizations<br>• Former Board Member, Washington Policy Center<br>• Former Board Chair, Association of Washington Business<br>• Former Board Chair, Inland Northwest YMCA<br>• Former Board Member, Spokane Symphony | HEIDI B.<br> STANLEY<br>MS. STANLEY is co-owner and chair of Empire Bolt & Screw, Inc., a privately-held international distribution company headquartered in Spokane, Washington. Prior to that, Ms. Stanley spent 24 years in the banking industry. She served as CEO and chair of Sterling Savings Bank from January 2009 to October 2009. From January 2008 to December 2008, she served as director, vice chair, president & CEO. From October 2003 to December 2007, she served as director, vice chair and COO. Previously, she held a variety of leadership positions with increasingly higher levels of managerial responsibility. Prior to joining Sterling in 1985, Ms. Stanley worked for IBM in San Francisco, California and Tucson, Arizona. Throughout her career, Ms. Stanley has provided leadership to the greater Spokane area and the Inland Pacific Northwest region through her service on a variety of charitable, educational and cultural organizations.<br>Ms. Stanley graduated from Washington State University with a B.A. in Business Administration.<br>REASONS FOR NOMINATION<br>Ms. Stanley's varied business experiences provide a diverse business perspective on risk analysis, operations, policy development, mergers and acquisitions, organizational development, board governance and capital markets. In addition, she has a long history of leadership, economic development and community support activities, all of which allow her to provide valuable leadership on governance and corporate responsibility matters through her service on the Governance Committee. In addition, through her broad financial background, Ms. Stanley is a valuable member of the Board's Audit Committee, where she plays an important role in ensuring proper oversight of the integrity of the Company's financial statements and related controls, compliance with legal and regulatory requirements, and the performance of the Company's internal audit function and independent auditors. In addition, Ms. Stanley provides deep understanding of the Company's customer base, as well as economic and political issues throughout the Company's service territories.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 17.0 |

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##### [**Table of Contents**](#toc)
PROPOSAL 1: ELECTION OF DIRECTORS

![LOGO](g853530g29v29.jpg)

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|:---|:---|
| ![LOGO](g853530g62i37.jpg)  | THE BOARD RECOMMENDS A VOTE "FOR" ALL DIRECTOR NOMINEES. |

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|:---|:---|
| INDEPENDENT DIRECTOR NOMINEE<br>Age: 59<br>Tenure: 12 Years<br>COMMITTEES<br>• Finance<br>• Governance (Chair)<br>BOARD AND PHILANTHROPIC SERVICE<br>• Board Member, Orthopedic Care Partners<br>• Board Member, Ideal Option<br>• Member, The Committee of 200<br>• Member, McKinsey & Company's Bay Area Women's Executive Roundtable<br>• Former Board Member, Delta Dental of California<br>• Former Executive Chair, Acorn Health<br>• Former Board Chair, Cutera (NASDAQ: CUTR)<br>• Former Board Member, California Health Professions Education Foundation; Bay Area Business Council<br>• Former Board Member, Versant Health | JANET D.<br> WIDMANN<br>MS. WIDMANN has more than 25 years of executive experience in health care service and technology-enabled health care companies. She is an Operating Partner with Varsity Healthcare Partners and previously served as the CEO of Acorn Health, a national provider of services to children with autism, and president and CEO of Kids Care Dental, a pediatric dental, orthodontic and oral surgery company. Ms. Widmann was executive vice president and chief executive of Blue Shield of California, a national health plan where she had overall profit and loss responsibility for $15 billion in annual revenue and 3.5 million members. Ms. Widmann began her career at Health Net, eventually serving as the COO of its dental and vision subsidiaries. Ms. Widmann has been consistently named one of the "Most Influential Women in the Bay Area" by the San Francisco Business Journal.<br>Ms. Widmann holds a B.S. in Health Administration from California State University, Northridge and an M.A. in Health Administration from the University of Southern California.<br>REASONS FOR NOMINATION<br>Ms. Widmann brings a strong background of executive leadership and economic development to her service on the Board. Her experience as CEO and COO of private companies includes risk management and oversight, finance and investment banking, mergers and acquisitions, technology and cybersecurity, organizational development and human resources, innovation, economic development and customer service. As the Chair of the Governance Committee, Ms. Widmann provides critical leadership in the oversight of governance-related issues, as well as the Company's disclosure of corporate responsibility matters, including environmental, social and governance issues. In addition, Ms. Widmann is a valuable member of the Board's Finance Committee which provides oversight of the Company's financial strategies, plans, programs, goals and objectives.<br>|
|  | &nbsp;&nbsp;&nbsp; <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUALIFICATIONS AND EXPERTISE<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Leadership<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Business Innovation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Technology<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Regulatory, Environmental and Risk<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Mergers and Acquisitions<br>|

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|:---|:---|
| 18.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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##### [**Table of Contents**](#toc)
CORPORATE GOVERNANCE MATTERS

## CORPORATE GOVERNANCE MATTERS
Corporate Governance Principles

The Board is responsible for directing the management of the business and affairs of the Company. As such, the Board gives the Company's executive officers strategic direction and oversees their operation of the Company's business and their conduct of its affairs, with a view to serving the best interests of the Company and its shareholders and other stakeholders.

The Board has adopted Governance Guidelines to address matters including qualification of directors, standards of independence for directors, election of directors, responsibilities and expectations of directors, and evaluation of director and committee performance. The Governance Guidelines are reviewed at least annually and updated as necessary. The Governance Guidelines, along with the Bylaws, Board Committee Charters, and the Code of Conduct, provide the framework for the governance of the Company.

Board Leadership Structure

The Board does not have a policy as to whether the role of CEO should be separate from the Chair, nor, if the roles are separate, whether the Chair should be selected from the independent directors. The Board selects the Chair in a manner it determines to be in the best interests of the Company and its shareholders. This flexibility has allowed the Board to determine whether the role should be separated based on the individuals and the circumstances existing at that time. The Board believes the Company has been well served by this permitting this flexibility.

Annually, the Board examines its governance practices, including the separation of the positions of the Chair and the CEO and the independence of the Chair. The Board believes it needs to retain the ability to balance the independent Board structure with the flexibility to appoint as Chair someone with hands-on knowledge of and experience in the operations of the Company. Currently, the roles of Chair and CEO are separated. Mr. Morris, who retired as CEO effective October 1, 2019, serves as the Chair of the Board. The Company is led by Ms. Rosentrater, who has served as its CEO since January 1, 2025.

Duties of the Chair

The Chair's duties include:

• Chairing all meetings of the Board in a manner that effectively utilizes the Board's time and which takes full advantage of the skills, expertise and experience of each director;

• Working with the Vice Chair and CEO to establish schedules and agendas for Board meetings, with input from other directors and management;

• Together with the Vice Chair, recommending an agenda to the Board for its approval for each shareholder meeting;

• Providing input to the Chair of the Governance Committee on new Board member candidates and the selection of the Board committee members;

• Facilitating and encouraging constructive and useful communication between the Board and management;

• Providing leadership to the Board in the establishment of positions the Board may take on issues to come before shareholder meetings;

• Conducting an objective assessment of the quality of each Board member; and

• With input from the CEO, ensuring the Board is provided with full information on the condition of the Company, its businesses, the risks facing the Company and the environment in which it operates.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 19.0 |

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CORPORATE GOVERNANCE MATTERS

Independent Vice Chair

The Board has also established the position of Vice Chair, which was previously designated as independent Lead Director. The person acting as Vice Chair must be independent. Donald Burke was selected to serve as Vice Chair for a three-year term beginning May 11, 2023.

The Vice Chair's duties include:

• Ensuring there is open and effective communication between the Board, the Chair and management of Board-related matters;

• Keeping an open line of communication that provides for dissemination of information to the Board and discussion before actions are finalized;

• Serving as an independent point of contact for directors, management or shareholders wishing to communicate with the Board other than through the Chair;

• Presiding at all meetings at which the Chair is not present; and

• Working with the Chair to set meeting schedules and agendas for the Board meetings, including soliciting input from non-management directors on items for the Board agendas, to ensure appropriate agenda items are included and there is adequate time for discussion of these items.

The Vice Chair is available for communications and consultation with major shareholders. The Company has a mechanism for shareholders and other interested parties to communicate with the Vice Chair and independent directors as a group, or on an individual basis. (See "Communications with Shareholders" in this section.)

Director Independence

The Board has been, and continues to be, a strong proponent of director independence. It is the policy of the Board that a majority of the directors be independent from management and that the Board not engage in transactions that would conflict with the best interests of the Company's business.

The Company's corporate governance structures and practices provide for a strong, independent Board and include several independent oversight mechanisms:

• All members of the Board are independent except for Ms. Rosentrater.

• All members of the Board committees are independent, except for Ms. Rosentrater, who is a member of the Executive Committee.

• Each Board committee has a separate independent Chair.

• All Board committees may seek legal, financial or other expert advice from sources independent from management.

The Board believes this governance structure and these practices ensure strong and independent directors will continue to effectively oversee the Company's management and key issues related to its long-range business plans, long-range strategic decisions, risks and integrity.

Independence determinations are made on an annual basis at the time the Board approves nominees for election at the next Annual Meeting and, if a director joins the Board between Annual Meetings, at such time. To assist in this determination, the Board adopted Categorical Standards for Independence of Directors (the "Categorical Standards"). As a result of this review, the Board affirmatively determined the directors nominated for election at the Annual Meeting are independent of the Company and its management, with the exception of Ms. Rosentrater. Ms. Rosentrater is an inside director because of her employment as President and CEO of the Company.

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| 20.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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CORPORATE GOVERNANCE MATTERS

Related Party Transactions

The Board recognizes related party transactions present a heightened risk of conflicts of interest and/or improper valuation of transactions (or the perception thereof) and, therefore, has adopted a written Related Party Transactions Policy, which is followed in connection with all related party transactions involving the Company and specified related persons including directors (including nominees) and executive officers, certain family members and certain shareholders, all as outlined in the applicable rules of the Securities and Exchange Commission ("SEC"). During its annual review, the Board considered whether there were any transactions or relationships between directors or members of their immediate families (or any entity of which a director or a director's immediate family member is an executive officer, general partner, or significant equity holder) and members of the Company's senior management or their affiliates inconsistent with a determination that the director is independent.

In particular, the Board considered whether the Company and its subsidiaries in the ordinary course of business have, during the last three years, purchased products and services from companies at which some of our directors were officers, board members, or investors during 2025.

SEC rules require the Company to disclose any related party transaction in which the amount involved exceeds $120,000 in the last year. The Governance Committee has determined the Company had no reportable related party transactions for 2025.

Board Meetings

The Board strongly encourages its members to attend all Board and committee meetings and the Annual Meeting. The Board held four meetings in 2025. Attendance at all Board and committee meetings, considered together, was 95.2%, reflecting a short-term leave of absence of one director to deal with a personal matter. All directors attended the prior year's Annual Meeting, and all directors are planning to attend the upcoming Annual Meeting.

Meetings of Independent Directors

The independent directors meet separately at each regularly scheduled Board meeting. The Chair and the Vice Chair collaboratively establish the agenda for each session and also determine which, if any, other individuals, including members of management and independent advisors, should be available for each such meeting.

Board Risk Oversight

The Board plays an active role in the identification of the major risks affecting the Company and the oversight of the Company's risk management. For organizational purposes, the Board has categorized the various risks facing the Company as follows:

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| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• utility regulatory<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• operational<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• climate change<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• cybersecurity<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• technology<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• strategic<br>| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• external mandates<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• financial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• energy commodity<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• compliance<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• resource adequacy<br>|

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While the Board retains full responsibility for the general oversight of the management of all categories of risk, it has delegated to and allocated among its committees first oversight responsibility regarding specific categories of risk. The allocation of categories of risk to the respective committees is described generally below and is more specifically set forth in the committee charters.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 21.0 |

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CORPORATE GOVERNANCE MATTERS

While management is responsible for the day-to-day management of risk, appropriate Company officers make periodic reports to the respective committees or, if circumstances so warrant, to the full Board, and respond to specific inquiries made by the committees and/or the Board. Following a risk report to a committee, the chair of that committee reports to the full Board. This process facilitates the coordination of the oversight and management of the various categories of risk, particularly for the interrelationships among various risks.

See Item 1A — "Risk Factors", Item 1C — "Cybersecurity", and Item 7 — "Management's Discussion and Analysis of Financial Condition and Results of Operations — Enterprise Risk Management" in the Annual Report for discussions of the various risks within the general categories listed above and the Company's risk management processes and procedures.

CEO Succession Plan

Selecting the best leader for our Company and planning and executing a smooth CEO transition is an important responsibility of the Board. Thoughtful succession plans for our CEO and for other officers are an important part of the Company's long-term success, and the Company has a long-term succession-planning process intended to develop a pipeline of qualified talent for key roles, reflecting a focus on the Company's business strategy.

The Compensation Committee conducts an annual review of the succession plans for our CEO and other executives of the Company and receives quarterly updates on the plans. Our CEO and the Compensation Committee review those succession plans annually with the full Board. The succession plans reflect the Board's belief that the Company should regularly identify internal candidates for the CEO and other executive positions, and it should develop those candidates for consideration when a transition is planned or necessary. Accordingly, management identifies internal candidates in various phases of development and implements development plans to assure the candidates' readiness. Those development plans identify the candidates' strengths and developmental opportunities, and the Compensation Committee receives periodic updates and regularly reviews the candidates' progress. In addition to internal development pools, to assure selection of the best candidate(s), the Company may recruit externally if such approach would better suit the Company's strategic needs. The Compensation Committee believes the Company's succession planning process provides a good structure to assure the Company will have qualified successors for its executive officers.

The Board has adopted a Contingency CEO Succession Plan to outline the procedures for the temporary appointment of an interim CEO to avoid a vacancy in leadership that may occur because of an absence event due to death, illness, disability, or sudden departure of our CEO.

Board and Committee Evaluations

The Board conducts an annual assessment of its performance and effectiveness, as well as that of the Chair and Vice Chair. The process is coordinated by the Board Chair and the Chair of the Governance Committee and is proctored through written assessments completed by each director. Areas of inquiry include, among other things, the following:

• Overall Board performance and areas of focus, including strategic and business issues, challenges and opportunities;

• Succession planning;

• Board committee structure and composition;

• Board culture;

• Board composition;

• Management performance; and

• Board meeting logistics, including quality of materials provided to the directors.

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| 22.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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CORPORATE GOVERNANCE MATTERS

Each Board committee also conducts an annual assessment of its performance and effectiveness, including that of the Committee Chair, through written assessments completed by each committee member. Areas of inquiry include, among other things, the following:

• The sufficiency of their charters;

• Whether committee members possess the right skills and experience or whether additional education or training is required;

• Whether there are sufficient meetings covering the right topics; and

• Whether meeting materials are effective.

Individual Director Assessments

Annually, the Board Chair considers the quality of each Board member, taking into account such factors as attendance, participation, engagement with other Board members, and any other factors deemed appropriate. This process includes a discussion between the Board Chair and the Chairs of each Board committee, as well as individual meetings with each director. The process provides an opportunity for input on individual director performance, as well as practical input from each director on what the Board should continue doing, start doing and stop doing. The information gathered through the assessment process is reviewed by the Governance Committee and considered in its recommendation of Board members to stand for election each year.

A summary of all committee assessment results is provided to the Governance Committee and the Board for review and discussion.

Director Orientation and Continuing Education

The Governance Committee and management are responsible for director orientation and mentorship programs. Orientation and mentorship programs are designed to familiarize new directors with the Company's business strategies and policies and help facilitate their effective transition onto the Board. The Governance Committee is also responsible for director continuing education. Continuing education programs for directors include a combination of internally developed materials and presentations and outside programs presented by third parties. Financial and administrative support is available to directors for attendance at academic or other independent programs.

Director Retirement Policy

Directors may not stand for election after age 75.

Code of Conduct

The Company has adopted a Code of Conduct that applies to members of the Board and our employees, including our CEO (the principal executive officer) and our CFO (the principal financial officer).

Information on Company Website

The Company's Corporate Governance Guidelines, the Code of Conduct, and the Related Party Transactions Policy are available on the Company's website at *https://investor.avistacorp.com/corporate-governance*. A written copy of any of these documents will be provided free of charge to any person upon request to the Corporate Secretary's office at 1411 East Mission Avenue, P.O. Box 3727 (MSC-10), Spokane, Washington 99220.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 23.0 |

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CORPORATE GOVERNANCE MATTERS

Communications with Shareholders

Shareholders and other interested parties may send correspondence to our Board or to any individual director to the Corporate Secretary's office at 1411 East Mission Avenue, P.O. Box 3727 (MSC-10), Spokane, Washington 99220. Concerns about accounting, internal control over accounting and/or financial reporting, or auditing matters should be directed to the Chair of the Audit Committee at the same address. All communications will be forwarded to the person(s) to whom they are addressed, unless it is determined the communication:

• Does not relate to the business or affairs of the Company or the functioning or constitution of the Board or any of its committees;

• Relates to routine or insignificant matters that do not warrant the attention of the Board;

• Is an advertisement or other commercial solicitation or communication;

• Is frivolous or offensive; or

• Is otherwise not appropriate for delivery to directors.

The director or directors who receive any such communication have discretion to determine whether the subject matter of the communication should be brought to the attention of the full Board or one or more of its committees and whether any response to the person sending the communication is appropriate. Any such response will be made through the Company's Corporate Secretary or General Counsel and only in accordance with the Company's policies and procedures and applicable laws and regulations relating to the disclosure of information.

Board Committees

The Board has six standing committees — Audit Committee, Compensation and Organization Committee ("Compensation Committee"), Governance and Corporate Responsibility Committee ("Governance Committee"), Finance Committee, Environmental, Technology and Operations Committee ("Environmental Committee") and Executive Committee. The committees, their membership as of the date of this proxy statement, and their principal responsibilities are described below.

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| 24.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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CORPORATE GOVERNANCE MATTERS

Each committee of the Board has adopted a Charter approved by the Board. The Charters are reviewed on an annual basis and amendments are made as needed. The committee Charters are available on the Company's website at *https://investor.avistacorp.com/corporate-governance*. A written copy of our committee Charters will be provided free of charge to any person upon request to the Corporate Secretary's office at 1411 East Mission Avenue, P.O. Box 3727 (MSC-10), Spokane, Washington 99220.

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| AUDIT COMMITTEE | AUDIT COMMITTEE |
| <br> ![LOGO](g853530g01h07.jpg) <br>Donald C. Burke<br> **CHAIR**<br>Other Members:<br> Jacobsen<br> Philipps<br> Stanley<br>**Number of Meetings:** 5 | <br> Responsibilities:<br> Assists the Board in overseeing the integrity of and the risks related to the Company's financial statements and accounting compliance, the Company's compliance program, the qualifications and independence of the independent registered public accounting firm, and the performance of the Company's internal audit function and independent registered public accounting firm. The Audit Committee also reviews the integrity of the Company's systems of internal controls regarding accounting, financial reporting, disclosure, compliance and ethics that management and the Board have established, including without limitation all internal controls established and maintained pursuant to the Securities Exchange Act of 1934, as amended (the "Exchange Act"), including those initiated pursuant to the Sarbanes-Oxley Act of 2002 (the "Sarbanes-Oxley Act"). The Audit Committee oversees management of the Company's exposure to accounting and financial risk, including questionable accounting or possible fraud, and oversees generally, to assist the full Board, the Company's overall risk assessment and risk management processes. Only independent directors sit on the Audit Committee. The Board determined Mr. Burke is an "Audit Committee Financial Expert," as defined in the SEC rules.<br>|

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| COMPENSATION COMMITTEE | COMPENSATION COMMITTEE |
| <br> ![LOGO](g853530g01h08.jpg) <br>Scott H. Maw<br> **CHAIR**<br>Other Members:<br> Klein<br> Philipps<br>**Number of Meetings:** 5<br>| <br> Responsibilities:<br> Considers and approves, as well as oversees the risks associated with, compensation and benefits of executive officers of the Company, as well as human capital management generally. This includes overseeing the organizational structure of the Company's management and succession planning for our CEO and other executive officers.<br>For a discussion of the Company's processes and procedures for the consideration and determination of executive officer compensation (including the role of executive officers and compensation consultants in determining or recommending the amount or form of compensation) see the CD&A.<br>The Compensation Committee is composed entirely of independent directors, as defined by the rules of the NYSE, and within the Company's Categorical Standards. In addition, the Compensation Committee is intended to comply with the "non-employee director" requirements of Rule 16b-3 under the Exchange Act, and to the extent still applicable, the "outside director" requirements of Section 162(m) of the Internal Revenue Code of 1986, as amended (the "Code").<br>|

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 25.0 |

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CORPORATE GOVERNANCE MATTERS

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| GOVERNANCE COMMITTEE | GOVERNANCE COMMITTEE |
| <br> ![LOGO](g853530g32v32.jpg) <br>Janet D. Widmann<br> **CHAIR**<br>Other Members:<br> Burke<br> Maw<br> Stanley<br>Number of Meetings: 4 | <br> Responsibilities:<br> Advises the Board on corporate governance matters and oversees the risks relating to such matters, including recommending guidelines for the composition and size of the Board and its committees, evaluating Board effectiveness and organizational structure and setting director compensation (see the section on Director Compensation). The Governance Committee oversees, among other things, issues regarding conflicts of interest, independence and compliance with SEC and NYSE rules and reviews and recommends to the full Board the allocation of risk management oversight to the various Board committees. The Governance Committee provides general strategic oversight of the Company's programs and practices relating to corporate responsibility. The Governance Committee also develops Board membership criteria and reviews potential director candidates. Recommendations for director nominees are presented to the full Board for approval. See Proposal 1—"Election of Directors". Only independent directors sit on the Governance Committee.<br>|

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| ENVIRONMENTAL COMMITTEE | ENVIRONMENTAL COMMITTEE |
| <br> ![LOGO](g853530g32v02.jpg) <br>Rebecca A. Klein<br> **CHAIR**<br>Other Members:<br> Bentz<br> Jacobsen<br> Kwawu<br>**Number of Meetings:** 4 | <br> Responsibilities:<br> Assists the Board in overseeing management of the Company's business and operational risks, other than financial risks. This includes regulatory, environmental compliance, employee and public safety, climate change, energy commodity, cyber and physical security, cyber technology strategy, wildfire risk, and external mandates.<br>|

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| 26.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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CORPORATE GOVERNANCE MATTERS

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| FINANCE COMMITTEE | FINANCE COMMITTEE |
| <br> ![LOGO](g853530g01h09.jpg) <br>Sena M. Kwawu<br> **CHAIR**<br>Other Members:<br> Bentz<br> Morris<br> Widmann<br>**Number of Meetings:** 4<br>| <br> Responsibilities:<br> Assists the Board in overseeing the Company's strategies, budgets, forecasts, and financial plans and programs, including those providing liquidity, and oversees the associated risks. The Finance Committee's activities and recommendations include reviewing management's qualitative and quantitative financial plans and objectives for both the short- and long-term; approving strategies with appropriate action plans to help ensure financial objectives are met; having in place a system to monitor progress toward financial goals, including monitoring commodity price and counterparty credit risk, overseeing and monitoring employee benefit plan investment performance and approving changes in investment policies and strategies, and monitoring management's program for hedging or otherwise mitigating financial and commercial risk; and providing strategic oversight of the Company's non-regulated investments and businesses.<br>|

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| EXECUTIVE COMMITTEE | EXECUTIVE COMMITTEE |
| <br> ![LOGO](g853530g01h10.jpg) <br>Scott L. Morris<br> **CHAIR**<br>Other Members:<br> Burke<br> Rosentrater<br> Stanley<br>**Number of Meetings:** 0<br>| <br> Responsibilities:<br> Has and may exercise, when the Board is not in session, all the powers of the Board that may be lawfully delegated, subject to such limitations as may be provided in the Bylaws, by resolutions of the Board, or by law. Generally, such action would only be taken to expedite Board authorization for certain corporate business matters when circumstances do not allow the time, or when it is otherwise not practicable, for the entire Board to meet. |

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 27.0 |

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DIRECTOR COMPENSATION

## DIRECTOR COMPENSATION
The Board regularly reviews director compensation with the assistance of Meridian Compensation Partners (the same consultant used for executive compensation) to determine whether it is appropriate and competitive in light of market circumstances and prevailing best practices for corporate governance for the energy/utility industry. The Board targets overall director compensation to the median of the same peer group used to review executive compensation. (See "Competitive Analysis and Peer Group" in the Compensation Discussion and Analysis.) As a result of this review process, the annual retainer for directors was increased from $235,000 to $250,000 effective September 1, 2025.

The elements of director compensation reflect the Board's view that compensation to the independent directors should consist of an appropriate mix of cash and stock. The cash portion of the retainer is paid quarterly, and the stock portion is paid annually (as soon as practicable following the Annual Meeting). Employee directors are not compensated for their Board service.

Elements of Director Compensation

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| | | |
|:---|:---|:---|
| &nbsp;&nbsp; Pay Element |  | Compensation<br> $ |
| ANNUAL RETAINER (CASH AND STOCK) | Board Members: | 250000 |
|  | (Directors receive an annual retainer of $250,000, with $145,000 automatically paid in stock.<br> Directors have the option of taking the balance in cash, stock or a combination of both cash and stock.) |  |
| ADDITIONAL CHAIR AND COMMITTEE CHAIR<br> RETAINERS (CASH) | Audit Committee | 25000 |
| ADDITIONAL CHAIR AND COMMITTEE CHAIR<br> RETAINERS (CASH) | Compensation Committee | 20000 |
|  | Environmental Committee | 15000 |
|  | Finance Committee | 15000 |
|  | Governance Committee | 15000 |
|  | Vice Chair | 30000 |
|  | Non-Executive Chair | 110000 |

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Each director is entitled to reimbursement of reasonable out-of-pocket expenses incurred in connection with meetings of the Board or its committees and related activities, including third party director education courses and materials. These expenses include travel to and from the meetings, as well as any expenses they incur while attending the meetings. The Company does not provide perquisites or other personal benefits to its Board members.

Director Stock Ownership Policy

The Company has a minimum stock ownership expectation for all Board members. Outside directors are expected to achieve a minimum investment of five times the minimum stock portion of their retainer and retain at least that level of investment while a Board member.

The ownership expectation illustrates the Board's philosophy of the importance of stock ownership for directors to further strengthen the commonality of interest between the Board and shareholders. The Governance Committee annually reviews director holdings and any director stock transactions that occurred during the year to determine whether they meet ownership expectations.

There were no annual stock option grants or non-stock incentive plan compensation payments to directors for services in 2025 and none are currently contemplated under the current compensation structure. The Company also does not provide a retirement plan or deferred compensation plan to its directors. Listed below is compensation paid to each non-employee director who served during any part of the 2025 fiscal year.

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| 28.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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DIRECTOR COMPENSATION

Director Compensation Table — 2025

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| | | | |
|:---|:---|:---|:---|
|  | Annual Retainer | Annual Retainer | |
| &nbsp;&nbsp; Director Name | Director<br> Compensation<br> Paid in Cash<br>($)<sup>(1)</sup> | Director<br> Compensation<br> Paid in Stock<br>($)<sup>(2)</sup> | Total<br>Compensation<br>($)<sup>(3)</sup> |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Director Name | Director<br>Compensation<br>Paid in<br>Cash($)<sup>(1)</sup> | Director<br>Compensation<br>Paid in<br>Stock($)<sup>(2)</sup> | Total<br>Compensation($)<sup>(3)</sup> |
| &nbsp;&nbsp; Julie A. Bentz | 98107 | 138293 | 236400 |
| &nbsp;&nbsp; Donald C. Burke | 148998 | 138293 | 287292 |
| &nbsp;&nbsp; Kevin B. Jacobsen | 98107 | 138293 | 236400 |
| &nbsp;&nbsp; Rebecca A. Klein | 62951 | 188224 | 251175 |
| &nbsp;&nbsp; Sena M. Kwawu | 112882 | 138293 | 251175 |
| &nbsp;&nbsp; Scott H. Maw | 116165 | 138293 | 254458 |
| &nbsp;&nbsp; Scott L. Morris | 199890 | 138293 | 338183 |
| &nbsp;&nbsp; Jeffry L. Philipps | 98107 | 138293 | 236400 |
| &nbsp;&nbsp; Heidi B. Stanley | 98107 | 138293 | 236400 |
| &nbsp;&nbsp; Janet Widmann | 112882 | 138293 | 251175 |
| &nbsp;&nbsp; Totals | 1146193 | 1432866 | 2579058 |

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(1) Amounts in this column include cash retainers, fractional stock issuances, Chair retainers, and Board and committee meeting fees.

(2) Amounts in this column include stock issuances. Stock is issued in whole shares based on the current market price at the time of issuance. Stock is fully vested upon issuance. All fractional shares are paid in cash.

(3) The Company does not provide perquisites or other personal benefits to its Board members.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 29.0 |

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AUDIT COMMITTEE REPORT

## AUDIT COMMITTEE REPORT
Charter and Responsibilities

The Audit Committee operates under a written Charter adopted by the Board that outlines its responsibilities and the practices it follows. The Charter can be found on the Company's website at *https://investor.avistacorp.com/corporate-governance*. The Audit Committee reviews and assesses the adequacy of its Charter at least annually, and, when appropriate, recommends changes to the Board.

The Audit Committee is composed of non-management directors who meet the independence and financial literacy requirements of the NYSE and additional, heightened independence criteria applicable to members of the Audit Committee under SEC and NYSE rules. The Audit Committee recommended to the Board the designation of Donald C. Burke as the Audit Committee Financial Expert solely for the purposes of compliance with the rules and regulations of the SEC implementing Section 407 of the Sarbanes-Oxley Act. The Board approved this recommendation.

The Audit Committee assists the Board in overseeing the integrity of the Company's financial statements, the Company's compliance with legal and regulatory requirements, the Company's Code of Conduct, the Company's enterprise risk management program and the independent auditor's qualifications and independence. The Audit Committee also assists the Board in fulfilling its responsibility for oversight of the Company's systems of internal controls, including, without limitation, those established and maintained pursuant to the Exchange Act and the Sarbanes-Oxley Act. In addition, the Audit Committee participates in external education sessions and educational sessions developed by management, at the request of the Audit Committee.

2025 Activity

During 2025, the Audit Committee fulfilled its duties and responsibilities as outlined in the Charter. Five meetings were held, with meeting agendas established by the Audit Committee's Chair and the Director of Internal Audit. Specifically, the Audit Committee:

• Reviewed and discussed with management and Deloitte, the independent auditor, the Company's unaudited quarterly financial statements and management's discussion and analysis of financial condition and results of operations.

• Reviewed with the CEO and CFO their certifications as to the accuracy of the Company's financial statements and the establishment and maintenance of internal controls and procedures.

• Reviewed with management all earnings press releases relating to 2025 annual and quarterly earnings prior to their issuance.

• Reviewed and discussed with Deloitte various matters including, without limitation, all critical audit matters, critical accounting policies, practices and estimates, significant changes in accounting principles or the application thereof, and the effect of regulation on the Company's financial performance and results of operations.

• Discussed with management, the internal auditors, and the independent auditor the quality and adequacy of the Company's systems of internal controls, and the internal audit functions, responsibilities, performance, and staffing.

• Reviewed the audit plans, audit scopes, and identification of audit risks with the independent and the internal auditors.

• Received from Deloitte a letter and other disclosures regarding the independent auditor's communications with the Audit Committee concerning the independent auditor's independence. The independent auditor advised the Audit Committee that this letter and other disclosures were required by the PCAOB auditor standards. The Audit Committee discussed with the independent auditor the latter's independence.

• Was advised by Deloitte that the matters discussed by Deloitte and the Audit Committee constituted all matters that PCAOB standards required Deloitte to discuss with the Audit Committee.

• Reviewed and approved the services and fees of the Company's independent auditor.

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|:---|:---|
| 30.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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AUDIT COMMITTEE REPORT

• Reviewed and approved the non-audit services performed by the Company's auditor and concluded that such services were consistent with the maintenance of independence.

• Reviewed the performance of Deloitte and approved its reappointment in 2025 as the Company's independent registered public accounting firm.

2025 Financial Statements

The Audit Committee reviewed and discussed with management and Deloitte the Company's audited financial statements and management's discussion and analysis of financial condition and results of operations for the year ended December 31, 2025. Additionally, the Committee reviewed Management's Report on Internal Control Over Financial Reporting and the Auditor's Report on the effectiveness of internal control over financial reporting. Based on its review and discussions, the Audit Committee recommended to the full Board, and the full Board approved, the inclusion of the Company's audited financial statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, for filing with the SEC.

This report is provided by the following independent directors, who comprise the Audit Committee:

Donald C. Burke — Chair Kevin B. Jacobsen Jeffry L. Philipps Heidi B. Stanley

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 31.0 |

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PROPOSAL 2: RATIFICATION OF APPOINTMENT OF DELOITTE AS INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR 2026

## Proposal 2

## RATIFICATION OF APPOINTMENT OF DELOITTE AS INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR 2026
What are you voting on?

We are asking our shareholders to ratify the selection of Deloitte & Touche LLP, the member firms of Deloitte Touche Tohmatsu, Ltd., and their respective affiliates (collectively, "Deloitte") as the independent registered public accounting firm to audit our consolidated financial statements and our internal control over financial reporting for 2026. Although the Audit Committee has direct responsibility for the appointment of the independent registered public accounting firm, as a matter of good corporate governance, the Board submits its selection of the independent registered public accounting firm to our shareholders for ratification.

Voting recommendation:

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| ![LOGO](g853530g62i37.jpg)  | <br> THE BOARD UNANIMOUSLY RECOMMENDS A VOTE "FOR"<br> THE RATIFICATION OF THE APPOINTMENT OF DELOITTE AS THE INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM. |

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The Audit Committee has the direct responsibility to hire, evaluate and, where appropriate, replace the Company's independent auditor and, in its capacity as a committee of the Board, is directly responsible for the appointment, compensation, and general oversight of the work of the independent auditor. The Audit Committee has appointed Deloitte as the Company's independent registered public accounting firm for continuing audit work in 2026.

Shareholder approval is not required for the appointment of Deloitte. However, the appointment is being submitted to shareholders for ratification. Should the shareholders fail to ratify the appointment of Deloitte, such failure (1) would have no effect on the validity of such appointment for 2026 (given the difficulty and expense of changing the independent registered public accounting firm midway through a year) and (2) would be a factor to be taken into account, together with other relevant factors, by the Audit Committee in the selection and appointment of the independent registered public accounting firm for 2027 (but would not necessarily be the determining factor).

Annual Evaluation and Selection of the Independent Auditor

The Audit Committee annually reviews Deloitte's independence and performance in deciding whether to retain Deloitte or engage another independent auditor. In the course of these reviews, the Audit Committee considers, among other things:

• Deloitte's historical and recent performance on the Company's audit.

• Deloitte's depth, expertise, and knowledge of the Company's business and industry.

• The quality and candor of Deloitte's communications with the Audit Committee and management.

• How effectively Deloitte maintained its independence and employed its independent judgment, objectivity, and professional skepticism.

• Available external data about quality and performance, including recent PCAOB reports on Deloitte.

• The appropriateness of Deloitte's fees.

• Deloitte's tenure as the Company's independent auditor, including the benefits of having a long-tenured auditor, and the safeguards in place to maintain its independence.

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|:---|:---|
| 32.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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PROPOSAL 2: RATIFICATION OF APPOINTMENT OF DELOITTE AS INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR 2026

Long Tenure Benefits

• Higher audit quality. Through years of experience with the Company, Deloitte (including its predecessors) has gained institutional knowledge of, and deep expertise regarding, the Company's operations and businesses, accounting policies and practices, and internal control over financial reporting.

• No onboarding or educating new auditor. Onboarding a new auditor requires a significant time commitment that could distract from management's focus on financial reporting and internal controls.

Independence Controls

• Audit Committee oversight. The Audit Committee meets with Deloitte at least four times per year. The committee also performs a comprehensive annual evaluation to determine whether to engage Deloitte. This evaluation includes assessments of Deloitte's qualifications and performance; approach to promoting and monitoring audit quality; quality and candor of communications; and independence, objectivity, and professional skepticism. The Audit Committee also has an active role in selecting the lead partner.

• Rigorous limits on non-audit services. The Audit Committee has a policy that requires pre-approval of all non-audit services, subject to a de minimis exception, and Deloitte is engaged only when it is best suited for the job.

• Strong internal Deloitte independence process. Deloitte conducts periodic internal quality reviews of its audit work, assesses the adequacy of partners and other personnel working on the Company's account, and rotates the lead partner every five years.

• Strong regulatory framework. Deloitte, as an independent registered public accounting firm, is subject to PCAOB inspections, peer reviews, and PCAOB and SEC oversight.

As a result of its evaluation, the Audit Committee concluded the selection of Deloitte as the independent registered public accounting firm for 2026 is in the best interests of the Company and its shareholders. The Audit Committee made this recommendation to the full Board, and the full Board approved.

Audit Fees and All Other Fees

The Audit Committee approves the fees paid to Deloitte for audit and non-audit services and receives periodic reports on the amount of fees paid. The aggregate fees for audit and other services provided by Deloitte in 2025 and 2024 were:

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| | | |
|:---|:---|:---|
| | 2025 | 2024 |
| &nbsp;&nbsp; Audit Fees<sup>(a)</sup> | $2158675 | $2170625 |
| &nbsp;&nbsp; Audit-Related Fees<sup>(b)</sup> | 10000 | 10000 |
| &nbsp;&nbsp; Tax Fees<sup>(c)</sup> |  | 11920 |
| &nbsp;&nbsp; All Other Fees<sup>(d)</sup> | 4131 | 4731 |
| &nbsp;&nbsp; Total | $2172806 | $2197276 |

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(a) Audit services performed in 2025 and 2024 for which audit fees were billed consisted of:

• Audit of the Company's annual consolidated financial statements and internal control over financial reporting.

• Reviews of the Company's quarterly reports on Form 10-Q.

• Comfort letters, statutory and regulatory audits, consents, and other services related to SEC matters.

(b) Audit-related services performed in 2025 and 2024 consisted of agreed-upon procedures.

(c) Tax services performed in 2024 consisted of general tax consulting related to federal, state and local tax matters.

(d) All other services performed in 2025 and 2024 consisted of licensing of accounting literature research databases, attendance at training seminars, and other miscellaneous projects.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 33.0 |

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PROPOSAL 2: RATIFICATION OF APPOINTMENT OF DELOITTE AS INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR 2026

Audit Committee Approval of Audit and Permissible Non-Audit Services of Independent Auditors

The Audit Committee is required to approve the audit and permissible non-audit services to be performed. The Audit Committee has adopted what it terms its Audit Committee Pre-Approval Policy (the "Policy"), which sets forth the procedures and conditions pursuant to which services proposed to be performed by the Company's independent registered public accounting firm are pre-approved. All services provided by Deloitte in 2025 and 2024 were approved specifically or pre-approved in accordance with the Policy adopted by the Audit Committee.

The Audit Committee approves services in advance, whether specifically or pursuant to general pre-approvals according to the Policy, only if the provision of such services is consistent with SEC and PCAOB rules on auditor independence and all other applicable laws and regulations. In rendering specific approvals or general pre-approval under the Policy, the Audit Committee considers whether the independent registered public accounting firm's provision of specific services, or categories of services, would be inconsistent with the independence of the auditor.

Hiring Restrictions for Deloitte Employees

The Audit Committee has adopted a policy that has certain restrictions on the Company's hiring of any Deloitte partner, director, manager, staff member, advising member of the department of professional practice, reviewing tax professional, and any other individuals responsible for providing audit assurance on any aspect of Deloitte's audit and review of the Company's financial statements.

Other Information

The Company has been advised by Deloitte that neither the firm, nor any covered person of the firm, has any financial interest, direct or indirect, in any capacity in the Company or its subsidiaries. A representative of Deloitte is expected to attend the Annual Meeting with the opportunity to make a statement if he/she desires to do so and is expected to be available to respond to appropriate questions.

Ratification of the appointment of the independent auditors requires the affirmative vote of a majority of the votes cast by the holders of the shares of common stock voting in person or by proxy at the Annual Meeting.

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|:---|:---|
| ![LOGO](g853530g62i37.jpg)  | <br> THE BOARD RECOMMENDS A VOTE "FOR" THE RATIFICATION OF THE APPOINTMENT OF DELOITTE AS THE INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM. |

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|:---|:---|
| 34.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

## COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")
This CD&A outlines the objectives and guiding principles of the executive compensation program for our NEOs. It is intended to provide context for the quantitative and narrative disclosures presented in the accompanying compensation tables within this Proxy Statement. Our NEOs for 2025 were:

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|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;• Heather L. Rosentrater, President and Chief Executive Officer<br>&nbsp;&nbsp;&nbsp;&nbsp;• Kevin J. Christie, Senior Vice President, CFO, Treasurer, and Regulatory Affairs Officer<br>&nbsp;&nbsp;&nbsp;&nbsp;• Jason R. Thackston, Senior Vice President, Growth, Energy Policy, & External Relations Officer<br>| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;• Bryan A. Cox, Senior Vice President, Safety, and Chief People Officer <br>&nbsp;&nbsp;&nbsp;&nbsp;• Gregory C. Hesler, Senior Vice President, General Counsel, Corporate Secretary, and Chief Ethics / Compliance Officer<br>|

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During 2025, the following leadership changes impacting our NEOs occurred:

• Ms. Rosentrater, who was previously serving as President and Chief Operating Officer, was elected President and Chief Executive Officer, effective January 1, 2025.

• Mr. Thackston, who was previously serving as Senior Vice President, Chief Strategy and Clean Energy Officer was elected Senior Vice President, Growth, Energy Policy & External Relations Officer.

The CD&A also describes the following:

• Our business results' impact on incentive compensation;

• Our decision-making process on compensation design and pay levels, including our compensation governance approach;

• Our compensation philosophy and objectives; and

• The elements of the Company's executive compensation program.

Business Results Impact on Incentive Compensation

The Compensation Committee, with input from the CEO, establishes target incentive compensation for our NEOs at the beginning of each performance period. The Board establishes target incentive compensation for our CEO also at the beginning of each performance period. Actual pay varies above or below the target based on individual, organizational, and stock performance. Because a substantial portion of each NEO's compensation is in the form of equity, our NEOs' actual compensation aligns closely with changes in the stock price.

We employ several quantitative criteria to assess the performance of our NEOs. Our objectives include achieving the EPS target, achieving favorable TSR relative to our peers, managing our costs per customer, customer satisfaction, our response time to natural gas emergency calls, reliability of service, and fostering a culture of accountability that supports the execution of our strategic goals. The charts below illustrate the relationship between our 2025 financial performance targets and our actual performance.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 35.0 |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

<br> RECENT PERFORMANCE RESULTS: SELECT ANNUAL INCENTIVE PLAN METRICS <br>![LOGO](g853530g42a01.jpg) <br>

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|:---|:---|
| <br> RECENT PERFORMANCE RESULTS: LONG-TERM INCENTIVE PLAN METRICS | <br> RECENT PERFORMANCE RESULTS: LONG-TERM INCENTIVE PLAN METRICS |
| <br> ![LOGO](g853530g42a02.jpg) <br>| <br> ![LOGO](g853530g42a03.jpg) <br>|

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|:---|:---|
| 36.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

The chart below illustrates the relationship between our 2025 performance and our CEO's 2025 compensation.

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| &nbsp;&nbsp; <br> CHIEF EXECUTIVE OFFICER:<br> 2025 TARGET COMPENSATION VS. REALIZED COMPENSATION<br>![LOGO](g853530g43a43.jpg) <br>|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \* The target amount shown for the RSUs is the grant date fair value of the portion of the 2023, 2024, and 2025 awards that could have vested if the CEO was not terminated on December 31, 2025. The target amount for the CEO's PSUs represents the aggregate grant date fair value of the 2023 awards that could have vested if the TSR and the three-year CEPS performance conditions were met for the 2023-2025 performance period. The amount shown as the actual compensation realized by our CEO for 2025 includes her base salary, the actual annual cash incentive plan amount paid in early 2026 for 2025 performance, the value, as of the vesting date, of the RSUs that vested in early 2026, and the actual value, as of the vesting date, of the PSUs that were realized for the 2023 – 2025 performance period. Values for RSUs and PSUs do not include dividend equivalents.<br>|

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Compensation Governance Practices

The Company highly values strong compensation governance practices. We believe our executive compensation practices align with our corporate values and provide a foundation for success. The governance practices we employ, and those we avoid, include:

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|:---|:---|
| <br> Practices We Employ<br>| <br> Practices We Avoid<br>|
| &nbsp;&nbsp;&nbsp;&nbsp; • We align pay and performance<br>• We mitigate undue risk (see Risk Mitigation Overview)<br>• We maintain stock ownership guidelines consistent with market practices<br>• We maintain a recoupment (i.e., clawback) policy that allows the Company to recoup compensation due to financial and other detrimental misconduct<br>• We pay Change in Control ("CIC") severance solely upon a double trigger<br>• The Compensation Committee reviews NEO tally sheets annually<br>• The Compensation Committee is composed entirely of independent directors<br>• The Compensation Committee engages an independent compensation consultant<br>• The Compensation Committee regularly meets in executive sessions without management present<br>| &nbsp;&nbsp;&nbsp;&nbsp; • We do not provide perquisites<br>• We do not permit hedging or short sales of Company stock by directors or officers<br>• We do not permit pledging of company stock by directors or officers<br>• We restrict the purchase and sale of securities under an insider trading policy<br>• We do not pay dividends or dividend equivalents on performance awards unless and until the awards are earned<br>• We do not provide any tax gross-ups under our CIC Plan<br>• We do not offer additional Supplemental Executive Retirement Plan ("SERP") service credits as a recruitment tool for hiring executives<br>|

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 37.0 |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

2025 Say on Pay Advisory Vote

At the May 2025 Annual Meeting, 96.48% of the votes cast were in support of our Say on Pay advisory resolution on our executive compensation. We view this outcome as a signal of strong shareholder support for our executive compensation philosophy, policies and practices, and made no changes as a result of the vote outcome.

Decision Making Process

ROLE OF THE COMPENSATION COMMITTEE

The Compensation Committee makes all compensation decisions regarding our CEO, our other NEOs and other executive officers, including the level of cash compensation and equity awards. Our CEO annually evaluates each executive officer's performance and presents his or her evaluation to the Compensation Committee for its consideration of salary adjustments, annual incentive opportunity and annual equity award amounts. The Compensation Committee annually reviews the CEO's performance, which it considers in the development of the CEO's salary adjustments, annual incentive opportunity and annual equity award amounts.

ROLE OF THE COMPENSATION CONSULTANT

The Compensation Committee selects and retains an independent compensation consultant to support its oversight of our executive compensation programs. For 2025, the Compensation Committee engaged Meridian Compensation Partners ("Meridian") as its independent compensation consultant. (The Committee also purchased survey information from the Willis Towers Watson ("WTW") Energy Services Executive Compensation database but did not otherwise consult with WTW.) Meridian provides the Compensation Committee consulting services solely relating to executive compensation and related governance matters. In accordance with NYSE rules, the Compensation Committee determined Meridian is independent and, further, no conflicts of interest arose due to Meridian's services rendered to the Compensation Committee.

A representative of Meridian attended Compensation Committee meetings in 2025 and advised the Compensation Committee on the principal aspects of executive compensation, including the competitiveness of program design and award values and specific analyses for our executive officers.

The Compensation Committee determines the work to be performed by Meridian. Meridian works with our SVP of Safety & Chief People Officer and his staff to gather data required in preparing its analyses for Compensation Committee review. Meridian provides services or advice to management only to the extent requested by the Compensation Committee.

Meridian interacts with management to gather information and obtain recommendations, but the Compensation Committee Chair determines if and when Meridian's advice and materials can be shared with management. When important pay decisions are made, Meridian provides advice to the Compensation Committee in an executive session without Company management present. This approach ensures the Compensation Committee receives objective advice from Meridian so the Compensation Committee can make independent decisions about executive pay.

ROLE OF MANAGEMENT

Our CEO provides input to the Compensation Committee regarding the total compensation and individual compensation components for each executive officer other than herself.

At the request of the Compensation Committee, both the SVP of Safety & Chief People Officer and our CEO regularly attend Compensation Committee meetings, excluding the executive sessions during which their respective compensation and other matters are discussed.

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| 38.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

RISK MITIGATION OVERVIEW

The Compensation Committee believes the Company's compensation policies and practices do not create risks reasonably likely to have a material adverse effect on the Company. In establishing pay practices for the Company, the Compensation Committee's goal is to design a compensation structure that does not encourage inappropriate risk-taking by employees or executive officers. The following features of the compensation structure reflect this approach:

• Short- and long-term incentive payments are capped;

• Annual cash incentive design balances key performance metrics focused on financial results and system sustainability over time;

• The total compensation program does not guarantee bonuses and has multiple financial and non-financial performance measures;

• The Compensation Committee reviews both short-term and long-term financial scenarios with a view to ensuring the plan design does not encourage executives to take excessive risks but also does not discourage appropriate risks;

• Stock ownership guidelines and insider trading prohibitions are in place to strengthen the alignment of the financial interests of executives with those of shareholders;

• Directors and officers are prohibited from engaging in short-sales, zero-cost collars, forward sales contracts, pledging, hedging or otherwise offsetting any decrease in the market value of their Company shares; and

• The Company maintains formal recoupment (i.e., clawback) policies.

Elements of Compensation

COMPENSATION PHILOSOPHY AND OBJECTIVES

Our executive compensation program is designed to align executive pay with our financial and operational performance and the creation of long-term value for our shareholders. To accomplish these objectives, our compensation program incents executive officers to achieve specific annual, long-term, and strategic goals and improves shareholder value. The Compensation Committee believes the overall compensation of our senior executives should be weighted toward variable performance-based compensation. As a result, a significant portion of compensation is linked with goals related to specific items of corporate performance likely to produce long-term shareholder and customer value.

The charts below show the portion of target compensation that is variable and, therefore, is "at risk" for our CEO and the average for our other NEOs. Variable compensation includes annual incentives, RSUs and PSUs. The charts also show the portion of target compensation for our CEO and the average target compensation for our other NEOs directly linked to share value, including RSUs and PSUs.

![LOGO](g853530g46a01.jpg)

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 39.0 |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

COMPETITIVE ANALYSIS AND PEER GROUP

The Compensation Committee believes it is important to provide a compensation structure competitive with compensation paid to comparable executives of companies within the energy/utility industry to ensure the Company can attract and retain quality employees in key positions to lead the Company. To achieve this objective, the Compensation Committee works with Meridian to conduct an annual competitive review of its total compensation program for our CEO and other NEOs. Through the review process, the Compensation Committee generally targets overall total compensation levels (base, short-term incentive and long-term incentives) at the median of the peer group. Pay components for an individual NEO may be higher or lower than the median depending on an individual's role, responsibilities, and performance within the Company. The Compensation Committee believes this target positioning is effective in attracting and retaining our executives.

The Compensation Committee annually compares each element of NEO total compensation against a peer group of publicly traded companies within the energy/utility industry of similar revenue size and market capitalization. For 2025, our NEO compensation was compared with market data, as disclosed in proxy statements, from the fifteen companies in the S&P 400 Mid-Cap Utilities Index ("Proxy Peer Group"). This group is designed to be representative of the Company's business, size and competitive market for talent.

The use of publicly disclosed data allows the Company to maintain a consistent peer group. The Proxy Peer Group can change slightly from year to year due to changes in the S&P 400 Mid-Cap Utilities Index. In 2025, Talen Energy was added and ALLETE, Inc. was removed following its acquisition and de-listing. The companies comprising the 2025 Proxy Peer Group were:

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| | | |
|:---|:---|:---|
| Black Hills Corporation | NorthWestern Corporation | Southwest Gas Holdings, Inc. |
| Essential Utilities, Inc. | OGE Energy Corp | Spire Inc. |
| IDACORP, Inc. | ONE Gas, Inc. | Talen Energy |
| National Fuel Gas Company | Ormat Technologies, Inc. | TXNM Energy, Inc. |
| New Jersey Resources Company | Portland General Electric Co. | UGI Corporation |

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To supplement market data derived from the Proxy Peer Group, the Compensation Committee also considers benchmark compensation data derived from the WTW Energy Services Executive Compensation database, which covers comparable diversified energy companies with revenues between $1 billion and $3 billion and with median revenues of $1.82 billion. This supplemental compensation data helps to inform the Compensation Committee on broad market compensation practices and trends within the energy services sector.

PERFORMANCE MANAGEMENT

The Compensation Committee believes in aligning pay with performance. To help accomplish that alignment, all executives receive annual performance reviews conducted by their direct manager, and the Compensation Committee reviews each NEO's performance.

At the beginning of each calendar year, the Compensation Committee asks our CEO to develop specific performance targets and goals for her role based on strategic goals for the Company set by the Board. The Compensation Committee reviews and approves our CEO's goals at its annual February meeting and presents those goals to the full Board for its information and review. The Board reviews our CEO's performance relative to targets quarterly. At the end of the year, the Compensation Committee reviews our CEO's year-end results as part of its overall CEO annual performance review process.

BASE SALARY

Our NEOs are provided with an annual base salary to compensate them for services rendered during the year. The Compensation Committee reviews the base salary of all executive officers at least annually. The factors influencing the Compensation Committee's decisions in setting the annual base salary for our NEOs include the market data provided by Meridian and each NEO's job complexity, experience and breadth of knowledge in the utility and diversified energy industry. The Compensation Committee also considers each NEO's responsibilities, which may include electric and natural gas utility

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| 40.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

operations, as well as subsidiary operations, and recognizes the Company operates in several states, which requires quality relationships and interaction with multiple regulatory agencies.

2025 Base Salaries

In addition to considering the factors noted above, the Compensation Committee also reviews performance results from the prior year to determine how our CEO performed against specific targets and operational goals established at the beginning of the prior year. Due to the CEO transition on January 1, 2025, the Committee evaluated the current CEO's 2024 performance as COO. These goals included strategic planning, financial performance, safety targets, diversified energy resource management, regulatory and legislative matters, succession planning, governance and customer value delivery. When reviewing the new CEO's base salary for 2025, the Compensation Committee determined the CEO successfully met these objectives for 2024.

The Compensation Committee also reviewed performance ratings of each of the other NEOs to determine appropriate adjustments in base salary. The Committee considered market data and individual performance in determining 2025 salary increases. Ms. Rosentrater was promoted to CEO in January 2025 and received an adjustment reflecting the substantial expansion of responsibilities. Based upon the market data provided by Meridian, the base salary for our CFO, Kevin Christie, was below the market median, and the Committee approved an 8% increase to bring his pay closer to the peer group median. The table below outlines the changes to base salary in 2025 for our NEOs.

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|:---|:---|:---|:---|
| | 2024 Salary | % Increase | 2025 Salary |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | $515000 | 55.3% | $800000 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | $440000 | 8.0% | $475000 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | $405000 | 3.0% | $417000 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | $371000 | 3.0% | $382000 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | $425000 | 5.4% | $448000 |

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2025 EXECUTIVE OFFICER ANNUAL CASH INCENTIVE PLAN

The 2025 Executive Officer Annual Cash Incentive Plan (the "Cash Incentive Plan") was designed to align the interests of our NEOs and senior management with those of our shareholders and customers through the achievement of financial and operational performance goals for the Company. The Cash Incentive Plan reflects these goals by having 50% of the total incentive opportunity tied to Utility Earnings Per Share, 40% tied to key components of utility operation, and 10% tied to achievement of our strategic goals. Each metric is independent, which allows the Cash Incentive Plan to pay a portion of the award upon the attainment of one goal even if the other goals are not met.

The Cash Incentive Plan's performance metrics are based on factors essential for the long-term success of the Company, and, except for Utility Earnings Per Share and the Strategy Scorecard metrics, are identical to performance metrics used in the Company's annual cash incentive plan for non-executive employees. The Compensation Committee believes having similar metrics for both the Cash Incentive Plan and the non-executive plan encourages employees at all levels of the Company to focus on common objectives.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 41.0 |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

The following chart shows the Cash Incentive Plan performance goals for each performance metric, the weighting of each metric, and the 2025 actual results of each metric.

![LOGO](g853530g36c11.jpg)

(1) Payout can vary 0%-175% based on performance level. Payout levels are interpolated on a straight-line basis for results between the threshold performance level and the maximum level.

(2) The Operating and Maintenance (O&M) cost is directly related to maintaining reliable, cost-effective service levels. Payouts can vary 0%-150% based on performance level. Payout levels are interpolated on a straight-line basis for results between the threshold performance level and the maximum level.

(3) This rating is derived from a Voice of the Customer survey conducted each quarter by an independent agency. The survey is used to track satisfaction levels of customers that have had recent contact with our call center or service center. This is a hit or miss target and the payout is either 100% or 0% based on achievement of objective.

(4) This measure is derived from the combination of three indices that track average restoration time for sustained outages, average number of sustained outages per customer, and percent of customers experiencing more than three sustained outages during the year. This is a hit or miss target and the payout is either 100% or 0% based on achievement of objective.

(5) This measures in minutes how quickly the Company responds to dispatched natural gas emergency calls. This is a hit or miss target and the payout is either 100% or 0% based on achievement of objective.

(6) Milestone includes target achievement of four out of five goals related to our strategic Company goals. Payouts can vary 0%-130% based on number of goals achieved.

Utility earnings per share ("EPS") and cost per customer are non-GAAP financial measures. Utility EPS represents earnings per share from our Avista Utilities and AEL&P segments, and excludes earnings related to our non-regulated other businesses. For the purposes of setting targets and evaluating performance, utility EPS also excludes the impact of the Energy Recovery Mechanism ("ERM") in Washington. Cost per Customer represents the other operating costs (including operating and maintenance costs), excluding specifically-identified items, divided by the number of retail customers as of the end of the previous year. See further discussion in Appendix B.

The Compensation Committee sets target goals for these performance metrics that are rigorous, but reasonably achievable with strong management performance. Maximum performance levels were designed to be difficult to achieve given historical performance and the Company's forecast results at the time the performance metrics were approved. Over the last ten years, the

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| 42.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

actual performance results of the plans have averaged 92% of target and ranged from a low of 25% of target to a high of 136% of target as shown in the chart below.

![LOGO](g853530g49b02.jpg)

2025 EXECUTIVE OFFICER ANNUAL CASH INCENTIVE TARGET AWARD OPPORTUNITY

Individual annual cash incentive awards are set as a percentage of base salary. The Compensation Committee compares annual cash incentive opportunity levels against the Proxy Peer Group. As discussed previously, the Compensation Committee targets overall total compensation levels, which include base salaries, short-term incentives, and long-term incentives, at the median of the Proxy Peer Group.

For 2025, the Compensation Committee maintained the target opportunity of 100% of base salary for the CEO and 60% of base salary for the SVPs. The actual total amounts paid could increase (up to 150% of target) or decrease (as low as 0% of target) depending on the Company's actual performance.

2025 RESULTS FOR THE EXECUTIVE OFFICER ANNUAL CASH INCENTIVE PLAN

After the end of each year, the Compensation Committee assesses the performance of the Company against each Plan objective, comparing the actual year-end results to the pre-determined threshold, target, and exceeds levels for each objective, and an overall percentage amount for meeting the objectives is calculated and audited.

Based on this review, at its February 2026 meeting, the Compensation Committee determined the Company met or exceeded the targets for all four non-financial metrics: Customer Satisfaction, Reliability, Average Response Time, and Strategy Scorecard. For the financial metrics, the Company exceeded the threshold for Utility Earnings per Share and exceeded target for O&M Cost Per Customer. Under the Cash Incentive Plan, the Compensation Committee has authority to modify or adjust financial targets due to extraordinary occurrences. For 2025, the Committee approved an adjustment to Utility Earnings per Share of $0.07. The result for Utility Earnings per Share was increased $0.07 for the impact of a regulatory disallowance associated with the Company's exit from Colstrip. The adjusted performance result of the 2025 Cash Incentive Plan was 114% of target. As a result, and at the same meeting, the Compensation Committee authorized payment of cash incentives equal to 114% of base salary (114% of 100%) for our CEO, and an average of approximately 68% of base salary (114% of 60%) for all other NEOs.

LONG-TERM EQUITY COMPENSATION

The Compensation Committee believes equity-based compensation is the most effective way to create a long-term link between shareholder returns and the compensation provided to NEOs and other key management. This program encourages participants to focus on long-term Company performance and provides an opportunity for executive officers and designated key employees to increase their ownership in the Company through grants of Company stock that can be earned based on either service or performance, over a three-year cycle. Using long-term performance awards and time-based restricted stock units ("RSUs"), the Company can compensate executives for sustained increases in the Company's stock performance, as well as long-term growth relative to its peer group for the relevant cycle.

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 43.0 |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

The Company's current Long-Term Incentive Plan ("LTIP") authorizes various types of equity awards. As with all the components of executive compensation, the Compensation Committee determines all material aspects of the long-term incentive awards — who receives an award, the form of the award, the amount of the award, the timing of the award, as well as any other aspect of the award it may deem material.

For 2025 equity grants, the Compensation Committee determined each NEO's target LTIP value based on competitive market data and the NEO's ability to influence overall Company performance. In addition, and as previously discussed, the Compensation Committee targets overall total compensation levels, which include base salaries, short-term incentives and long-term incentives, at the median of the Proxy Peer Group. The Compensation Committee determined 65% of the NEO's target LTIP value would be granted in the form of performance share units ("PSUs") and 35% of the NEO's target LTIP value would be granted in the form of RSUs. Awards are generally granted each year at the February Compensation Committee meeting and the granting of awards is not coordinated with the release of material non-public information.

Performance-Based Equity Awards

In February 2025, the Compensation Committee approved the grant of PSUs to each NEO. The 2025 PSUs are designed to provide a direct link to the long-term interests of shareholders by ensuring shares will be paid only if the Company attains specified performance levels. For 2025, 13% of the awards were contingent on our Total Shareholder Return ("TSR") relative to our peers and 52% was measured by our Cumulative Utility Earnings Per Share ("CEPS") over a three-year period. The Compensation Committee has authorized use of utility EPS as the EPS measure for CEPS awards. Utility EPS is a non-GAAP financial measure. Utility EPS represents earnings per share from our Avista Utilities and AEL&P segments, and excludes earnings related to our non-regulated other businesses. For the purposes of setting targets and evaluating performance, utility EPS also excludes the impact of the ERM in Washington. See further discussion in Appendix B. The Compensation Committee considered market data provided by Meridian regarding the total compensation levels for our CEO and all other NEOs compared to the median of the Proxy Peer Group.

![LOGO](g853530g50a03.jpg)

The peer group for TSR performance purposes consists of the 15 companies comprising the S&P 400 Mid-Cap Utilities Index as of January 1 in the first year of the three-year performance cycle. Throughout the course of the performance cycle, companies may be added or dropped from the index by S&P due to mergers or other activities. Starting with the 2024 grant and for the foreseeable future, the peer companies used for ranking will be fixed at the performance award grant date and will not change during the cycle. If S&P removes or adds companies to the index, the original list remains unchanged; dropped companies stay in the ranking if still publicly traded, and new additions are excluded.

The number of PSUs vesting is determined at the end of the three-year performance cycle based on the Company's percentile rate-of-return ranking compared to the companies in the S&P 400 Mid-Cap Utilities Index, and are payable at the Compensation Committee's discretion in cash, shares of Company common stock, or a combination of both. Dividend equivalents on performance awards are accumulated and paid upon vesting if the awards vest and are paid based on performance. If the Company's relative TSR over the three-year performance period is below the threshold performance required to earn the award, accumulated dividends are forfeited as well.

The second performance metric, CEPS, aligns with current competitive practices within the peer group based on market data provided by the Compensation Committee's consultant. Each year the Compensation Committee reviews and establishes a threshold, target, and maximum performance level for CEPS. The Compensation Committee seeks to establish performance levels that assure the goals are realistic enough to be achievable yet difficult enough to incentivize outstanding performance. The amount of payment of any award is determined at the end of the three-year performance cycle based on the Company's earnings and is payable at the Compensation Committee's discretion in cash, shares of Company common stock, or a combination of both.

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| 44.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

Dividend equivalents on performance awards are accumulated and paid upon vesting if the awards vest and are paid based on performance. If the Company's CEPS over the three-year performance period is below the threshold performance required to earn the award, accumulated dividends are forfeited as well.

Range of Award Opportunity for Performance Share Units

Each year, the Compensation Committee approves a grant to each NEO of a target number of PSUs that vest over a three-year performance cycle based on achieving pre-determined performance goals. The number of PSUs that may be earned at the end of the performance cycle can range from 0% to 200% of the target, depending upon the level of achieved performance. The target number of PSUs granted to each NEO is determined by dividing the NEO's target LTIP value allocated to PSUs by the grant date share price of our common stock.

The table below shows the changes made to the target value of PSU grants in 2025 for the 2025 through 2027 performance period for our NEOs. Grants were delivered 35% in RSUs and 65% in PSUs. Ms. Rosentrater received a larger increase in value to better align her compensation with the market following her promotion to CEO in January 2025.

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| | | | |
|:---|:---|:---|:---|
| | 2024 Grant ($) | % Change | 2025 Grant ($) |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | $525047 | 229.0% | $1727595 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | $385021 | 48.1% | $570084 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | $287069 | 43.6% | $412105 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | $231058 | 57.1% | $363107 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | $259031 | 59.1% | $412105 |

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The table below outlines the target number of PSUs granted in 2025 by performance metric.

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| | | | |
|:---|:---|:---|:---|
| | Relative TSR | CEPS | 2025 Grant (#) |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 10412 | 36305 | 46717 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 2840 | 12576 | 15416 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 1941 | 9203 | 11144 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 1610 | 8209 | 9819 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 1941 | 9203 | 11144 |

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The following graphs show the percentage of performance share units that will be earned at different levels of achieved performance.

![LOGO](g853530g52a01.jpg)

![LOGO](g853530g52b02.jpg)

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 45.0 |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

2023-2025 Performance Shares Settlement

For performance shares linked to the Company's TSR and granted in 2023 for the performance period ending December 31, 2025, the Compensation Committee reviewed, certified, and settled the issuance of shares to executive officers. The Company's cumulative TSR was 4.35% during the three-year performance cycle, which placed the Company at the 8th percentile among the S&P 400 Mid-Cap Utilities Index. As the results were below threshold performance level, no shares were earned, and no cash dividend equivalents were paid on performance shares granted in 2023.

For performance shares linked to the Company's CEPS and granted in 2023 for the performance period ending December 31, 2025, the Compensation Committee reviewed, certified and settled the issuance of shares to executive officers at its February 2026 meeting. Under the LTIP and underlying CEPS agreements with each NEO, the Compensation Committee can adjust performance goals and measurements as it deems necessary or appropriate to reflect the inclusion or exclusion of the impact of extraordinary or unusual items, events or circumstances. For the CEPS performance period ending in 2025, the Compensation Committee approved an adjustment to cumulative earnings per share of $0.08. Cumulative earnings per share increased $0.07 associated with a regulatory disallowance regarding the Company's exit from Colstrip and increased $0.01 related to removing the impact of the CEPS performance award expenses for the period ending in 2025. After these adjustments, the Company's CEPS for the 2023-2025 performance cycle was $6.99. Beginning with the 2026-2028 CEPS grant, the CEPS goal explicitly excludes the expense related to the CEPS performance awards for that year if recognition of this expense causes results to fall below threshold. Based on these results, our CEO and our other NEOs earned 40% of the CEPS performance share awards granted in 2023. Accrued cash dividend equivalents were paid out on the same percentage of performance shares covered by the 2023 grant.

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | Realized Value Received Performance Share Awards | Realized Value Received Performance Share Awards | Realized Value Received Performance Share Awards | Realized Value Received Performance Share Awards | Realized Value Received Performance Share Awards |
| &nbsp;&nbsp; NEO | TSR (#) | CEPS (#) | Value | Dividend<br>Equivalents | Total<br>Realized<br>Value |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater |  | 2752 | $109860 | $17042 | $126902 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie |  | 2724 | $108742 | $16868 | $125610 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston |  | 2052 | $81916 | $12707 | $94623 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox |  | 1376 | $54930 | $8521 | $63451 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler |  | 1652 | $65948 | $10230 | $76178 |

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Restricted Stock Units (RSUs)

In February 2025, the Compensation Committee approved the grant of RSUs to each NEO. These RSUs are designed to incent retention, link compensation to the value of the Company common stock and align the interests of our NEOs with those of our shareholders. The RSUs are subject to three-year ratable vesting. On each vesting date, one-third of the RSUs are settled in shares, provided the NEO remains continuously employed by the Company through the vesting date. Dividend equivalents on RSUs accrue and are paid in cash to the extent the underlying RSUs vest. To the extent RSUs are forfeited, the accrued dividend equivalents on such RSUs also would be forfeited.

The number of RSUs granted to each NEO was determined by dividing the NEO's target LTIP value allocated to RSUs by the grant date share price of our common stock. The table below shows the changes made to the target value of RSU grants in 2025 for the 2025 through 2027 vesting period for our NEOs. Grants were delivered 35% in RSUs and 65% in PSUs. Ms. Rosentrater received a larger increase in value to better align her compensation with market levels following her promotion to CEO in January 2025.

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| | | | |
|:---|:---|:---|:---|
| | 2024 Grant ($) | % Change | 2025 Grant ($) |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | $224955 | 276.7% | $847434 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | $164995 | 100.0% | $329936 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | $122955 | 101.7% | $247951 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | $98964 | 129.3% | $226946 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | $110976 | 123.4% | $247951 |

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| 46.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

The following chart shows the value realized by our NEOs for the RSUs vested and issued along with the associated cash dividend equivalents.

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| | | | | |
|:---|:---|:---|:---|:---|
|  | Realized Value Received | Realized Value Received | Realized Value Received | Realized Value Received |
|  | Restricted Stock Units | Restricted Stock Units | Restricted Stock Units | Total<br>Realized<br>Value |
| &nbsp;&nbsp; NEO | # | Value | Dividend<br>Equivalents | Total<br>Realized<br>Value |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 11246 | $438032 | $56487 | $494519 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 5954 | $231908 | $26631 | $258539 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 4467 | $173990 | $19976 | $193966 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 3711 | $144543 | $17272 | $161815 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 4153 | $161759 | $19122 | $180881 |

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PERQUISITES

The Company does not provide any perquisites or personal benefits to our CEO or any other NEO.

OTHER BENEFITS

The majority of our employees, including our NEOs, are eligible for the Company's defined benefit plan, the Company's 401(k) plan, health and dental coverage, Company-paid term life insurance, disability insurance, paid time off and paid holidays.

The Company's defined benefit plan provides a traditional retirement benefit based on employees' compensation and years of credited service. Earnings credited for retirement purposes represent the final average annual base salary of the employee for the highest 36 consecutive months during the last 120 months of service with the Company. The NEOs participate in this retirement plan, with the exception of Mr. Hesler, who was hired by the Company after participation in the plan was closed to new non-union employees. Mr. Hesler participates in the Company's enhanced 401(k) plan.

SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

In addition to the Company's defined benefit plan, the Company provides additional pension benefits through the SERP to the Company's executive officers, with the exception of Mr. Hesler, who, based upon his hire date with the Company, participates in the Company's enhanced 401(k) plan which includes a 100% match on the first 6% of contributions plus a non-elective company contribution of 3%, 4%, or 5%, based on age. Details of the SERP benefits and the amounts accrued by each NEO are found in the Pension Benefits section.

The Compensation Committee believes the pension plans, the 401(k), and the SERP are an important part of our NEOs' compensation. These plans are market competitive within the energy/utility industry and serve a critically important role in the retention of senior executives. The benefits increase each year these executives remain employed, thereby encouraging our most senior executives to remain employed and continue their work on behalf of shareholders.

EXECUTIVE DEFERRED COMPENSATION

The Company also maintains an Executive Deferred Compensation Plan (the "EDC Plan"). Each NEO may voluntarily participate in the EDC Plan on the same terms and conditions as all other eligible employees who reach a set compensation level. The EDC Plan is competitive in the market and provides eligible employees and executives with a tax-efficient savings method. Additional information about the EDC Plan, including 2025 company match amounts, can be found in the "Non-Qualified Deferred Compensation Plan" table.

COMPANY SELF-FUNDED DEATH BENEFIT PLAN

To provide death benefits to beneficiaries of executive officers who die during their term of office, the Company maintains an executive death benefit plan providing an executive officer's designated beneficiary with a lump sum payment equal to twice the

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 47.0 |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

executive officer's final annual base salary, payable within 30 days of the executive's death. Prior to January 1, 2008, the plan continued to provide the death benefit to the beneficiaries of executives who died after retirement. Effective January 1, 2008, the post-retirement death benefit was eliminated for any individual who became an executive officer after that date. Individuals who were executive officers prior to January 1, 2008 continue to be eligible for the post-retirement death benefit. For an officer who is eligible for the post-retirement death benefit, in the event of his or her death after retirement, the designated beneficiary will receive a lump sum equal to twice the retired executive officer's total annual pension benefit. Death benefits are paid from the general assets of the Company. The present value of this benefit for each NEO can be found in the "Potential Payments Upon Termination or CIC" tables.

SUPPLEMENTAL EXECUTIVE DISABILITY PLAN

The Supplemental Executive Disability Plan provides benefits to the Company's executive officers who become disabled during employment. The plan provides a benefit equal to 60% of the executive officer's annual salary at the date of disability reduced by the aggregate amount, if any, of disability benefits provided for under the Company's Long-Term Disability Plan for employees, workers' compensation benefits, and any benefit payable under provisions of the Federal Social Security Act. Benefits will be payable until the earlier of the executive officer's date of retirement or age 65. The present value of this benefit for each NEO can be found in the "Potential Payments Upon Termination or CIC" tables.

CHANGE IN CONTROL ("CIC") AND SEVERANCE BENEFITS

The Compensation Committee believes it is in the interest of shareholders to provide severance to our executive officers in the event of a CIC, thereby reducing the inherent conflict of our executive officers pursuing a transaction that may result in their personal job loss. Effective January 1, 2020, our Executive Change in Control Plan ("CIC Plan") was put in place for all executive officers of the Company replacing individual agreements certain executive officers had regarding a CIC. The following are key features of the plan:

• Severance multiple: NEOs prior to January 1, 2020 would receive three times the sum of the executive's annual base salary and target annual bonus. Future NEOs and other officers would receive two times the sum of the executive's annual base salary and target annual bonus.

• Severance also includes reimbursement of 18 months of COBRA premiums, if COBRA is elected by the individual.

• Payment of severance is conditioned on the individual's delivery of a release of claims.

• "Good reason" includes material diminution of authority, responsibility, pay, bonus opportunity or budget overseen, material relocation or material breach by the Company of the plan.

• Certain protections, such as a minimum annual base salary, provided to executive officers during continued employment for up to two years following CIC.

• No 280G excise tax gross up: CIC benefits are limited to greater of, on an after-tax basis, the full amount of CIC benefits subject to excise tax or a reduced amount equal to the maximum amount of CIC benefits that could be paid without triggering the 280G excise tax.

Additional information regarding the CIC Plan, including definitions of certain key terms and a quantification of benefits that hypothetically would have been received by our NEOs under the CIC Plan, using a termination due to a CIC on December 31, 2025, can be found in the "Potential Payments Upon Termination or CIC" Tables.

Internal Revenue Code ("Code") Section 162(m)

Code Section 162(m) prohibits a publicly held corporation from taking a deduction for compensation paid to an NEO in excess of $1 million for any fiscal year. When consistent with the Company's compensation philosophy and objectives, the Compensation Committee structures its compensation plans so the related compensation expense may be deductible for tax purposes.

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| 48.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

However, in light of the need to maintain flexibility in administering our executive compensation program and the 2017 changes in the tax law, the Compensation Committee retains discretion to recommend to the Board executive compensation that will not be deductible.

Compensation Governance Matters

RECOUPMENT POLICIES

Under Section 10D of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 ("Dodd-Frank Act"), and NYSE rules adopted pursuant to Rule 10D-1 enacted thereunder, the Company is required to adopt and comply with a policy in which the Company will reasonably promptly recover incentive compensation that is determined to have been erroneously awarded to executive officers due to a required accounting restatement. Effective August 3, 2023, the Company adopted its Dodd-Frank Recovery Policy in order to comply with SEC and NYSE rules.

The Compensation Committee believes that the Company should maintain the ability to seek recovery of erroneously awarded incentive compensation beyond the required provisions of Rule 10D-1 and NYSE rules, in particular where employees (including non-executives) engage in misconduct. Therefore, in addition to the mandatory recoupment policy adopted in compliance with the Dodd-Frank Act and NYSE rules, the Board has adopted a discretionary recoupment policy applicable to incentive compensation awards. The discretionary policy authorizes the Company to recover incentive payouts from any executive or employee if those payouts are based upon performance results subsequently revised or restated to levels that would have produced payouts lower than the original incentive plan payouts, and, if, in the Board's judgment and determination, the executive or employee engaged in fraud, negligence, or other misconduct that contributed to the need for the financial restatement. If willful or negligent misconduct or material error results in a restatement of financial results, the Compensation Committee may recommend that the Board either require forfeiture of incentive awards or seek to recover appropriate portions of the executive officer or employee's compensation for the relevant period, in addition to other disciplinary actions that might be appropriate based on the circumstances.

Effective February 5, 2020, the Compensation Committee expanded the discretionary recoupment policy to allow up to three years of incentive compensation to be subject to recovery for detrimental conduct, which includes:

• The commission of an act of fraud, misappropriation or embezzlement in the course of employment;

• The commission of a criminal act, whether or not in the workplace, that in the Board's sole discretion, constitutes a felony or crime of comparable magnitude;

• The material violation of any applicable restrictive covenant (including, but not limited to, non-solicitation, non-compete or non-disclosure covenants);

• The willful and material breach of a Covered Person's obligations under the Company's Code of Conduct relating to compliance with law or regulations giving rise to dismissal under the Code of Conduct or termination for Cause; or

• Any act or omission involving willful misconduct resulting in such Covered Person's termination for cause.

The Board, in its discretion, would determine when the need for a recoupment is triggered, to whom the recoupment would apply, the amount subject to recoupment and the mechanism for recoupment.

STOCK OWNERSHIP GUIDELINES

The Board has implemented stock ownership guidelines for the Company's executive officers. The guidelines require executive officers to own shares and achieve set ownership levels based on a formula designated as a multiple of salary within a target timeframe of five years from their employment date or date of promotion, as described within the program guidelines. The value for each executive's ownership level is determined by using the average closing share price over the prior calendar year. This methodology aligns with current competitive practices within the peer group based on market data provided by Meridian.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 49.0 |

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COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

The objectives of our stock ownership guidelines are to:

• Strengthen alignment of the executives' financial interests with those of shareholders;

• Enhance executive long-term perspective and focus on shareholder value growth;

• Reinforce "pay at risk" philosophy and provide an additional basis for sharing in Company success or failure as reflected in shareholder returns; and

• Align Company practice with corporate governance best practices.

Each year at the February meeting, the Compensation Committee reviews the ownership levels to assure adherence to the guidelines. In 2025, the Compensation Committee conducted its annual review to assess whether each officer was at or moving toward the required ownership level for his or her position. The Compensation Committee determined all NEOs were in compliance with the ownership guidelines.

The specific ownership targets and certain other components of the guidelines are as follows:

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|:---|:---|:---|
| &nbsp;&nbsp;Requirement | Ownership Definition | Retention Requirement |
| • CEO & PRES—5 times salary<br>• SVPs—2.5 times salary<br>• VPs—1 times salary<br>| • Direct holding and family holdings<br>• Shares held in 401(k)<br>• Shares held in Executive Deferred Compensation Account<br>• Unvested time-based RSUs<br>| Officers must retain 50% of the net shares received upon restricted stock release or issuance of performance shares earned until this required ownership level is achieved |

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Based on the guideline definition of ownership, the following chart shows the required ownership level for each NEO and the number of shares owned as of March 3, 2026.

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| | | | | |
|:---|:---|:---|:---|:---|
| | Ownership<br>Level | Required | Owned | Status of<br>Compliance<br>with Ownership<br>Requirement |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 5x | 104167 | 78827 | Not Met<sup>(1)</sup> |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 2.5x | 30924 | 49832 | Met |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 2.5x | 27148 | 44788 | Met |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 2.5x | 24870 | 19668 | Not Met<sup>(2)</sup> |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 2.5x | 29167 | 24970 | Not Met<sup>(3)</sup> |

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(1) Ms. Rosentrater has until 2030 to meet the required ownership target based on her promotion date of January 1, 2025.

(2) Mr. Cox has until 2028 to meet the required ownership target based upon his promotion date of October 1, 2023.

(3) Mr. Hesler has until 2027 to meet the required ownership target based upon his promotion date of September 1, 2022.

INSIDER TRADING POLICY

The Company has an Insider Trading Policy governing transactions in securities of the Company. The Policy covers directors, executive officers, other designated employees and other employees who come into possession of material non-public information regarding the Company, as well as employees of subsidiaries and consultants (collectively, "Covered Persons"). We believe our Insider Trading Policy is reasonably designed to promote compliance with insider trading laws, rules and regulations, and applicable listing standards.

Among other things, the Insider Trading Policy prohibits Covered Persons from trading in securities of the Company while in possession of material non-public information regarding the Company.

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| 50.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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#### **Table of Contents**
COMPENSATION DISCUSSION AND ANALYSIS ("CD&A")

The Insider Trading Policy also prohibits Covered Persons from engaging in "short sales" of Avista securities (including "sales against the box"), zero-cost collars, forward sale contracts and other transactions that hedge or offset any decrease in the market value of equity securities and publicly-traded options, such as puts, calls and other derivative securities. The policy also restricts the pledging of Avista securities as collateral for a loan. A copy of our Insider Trading Policy is filed as Exhibit 19 to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

POLICIES AND PRACTICES RELATED TO THE GRANT OF CERTAIN EQUITY AWARDS CLOSE IN TIME TO THE RELEASE OF MATERIAL NON-PUBLIC INFORMATION

The Company does not currently grant new awards of stock options, stock appreciation rights, or similar option-like instruments. Accordingly, the Company has no specific policy or practice on the timing of awards of such options in relation to the disclosure of material non-public information by the Company. In the event the Company determines to grant new awards of such options, the Board and the Compensation Committee will evaluate the appropriate steps to take in relation to the adoption of such a policy.

COMPENSATION COMMITTEE REPORT

The Compensation Committee of the Board reviewed and discussed the CD&A with management, and based on such review and discussions, the Compensation Committee recommended to the Board the CD&A be included in the Company's Annual Report on Form 10-K and in this proxy statement.

Members of the Compensation Committee of the Board

Scott H. Maw—Chair Rebecca A. Klein Jeffry L. Philipps

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| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 51.0 |

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EXECUTIVE COMPENSATION TABLES

## EXECUTIVE COMPENSATION TABLES
The Summary Compensation Table ("SCT") below provides summary compensation information for our NEOs: the CEO, the CFO, and the three other most highly compensated executive officers who were serving as such on December 31, 2025:

Summary Compensation Table — 2025

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp; Name and<br> Principal Position | Year | Salary<sup>(1)</sup> | Stock<br>Awards<br>($)<sup>(2)</sup> | Non-Equity<br>Incentive Plan<br>Compensation<br>($)<sup>(3)</sup> | Change in<br>Pension and Non-<br>Qualified Deferred<br>Compensation<br>Earnings<br>($)<sup>(4)</sup> | All Other<br>Compensation<br>($)<sup>(5)</sup> | Total<br>Compensation<br>($) |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater<br> President & CEO | 2025 | $786845 | $2653743 | $897732 | $419238 | $15750 | $4773308 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater<br> President & CEO | 2024 | $512693 | $764481 | $246237 | $147878 | $15525 | $1686813 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater<br> President & CEO | 2023 | $459500 | $561028 | $70361 | $223727 | $14850 | $1329466 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie<br> SVP, CFO, Treasurer,<br> and Regulatory Affairs Officer | 2025 | $468269 | $921490 | $320556 | $248250 | $15750 | $1974314 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie<br> SVP, CFO, Treasurer,<br> and Regulatory Affairs Officer | 2024 | $433847 | $560633 | $192340 | $165493 | $15525 | $1367838 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie<br> SVP, CFO, Treasurer,<br> and Regulatory Affairs Officer | 2023 | $386446 | $565941 | $57967 | $218552 | $14850 | $1243756 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston<br> SVP, Growth, Energy<br> Policy & External Relations Officer | 2025 | $414692 | $674730 | $283879 | $425794 | $18360 | $1817455 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston<br> SVP, Growth, Energy<br> Policy & External Relations Officer | 2024 | $403001 | $417940 | $178665 | $255376 | $18197 | $1273180 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston<br> SVP, Growth, Energy<br> Policy & External Relations Officer | 2023 | $389386 | $418227 | $58408 | $337139 | $17322 | $1220482 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox<br> SVP, Safety, & Chief<br> People Officer | 2025 | $379884 | $602224 | $260052 | $284629 | $18631 | $1545421 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox<br> SVP, Safety, & Chief<br> People Officer |  |  |  |  |  |  |  |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox<br> SVP, Safety, & Chief<br> People Officer |  |  |  |  |  |  |  |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler<br> SVP, General<br> Counsel, Corporate Secretary & Chief Ethics / Compliance Officer | 2025 | $443576 | $674730 | $303652 | N/A | $40547 | $1462504 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler<br> SVP, General<br> Counsel, Corporate Secretary & Chief Ethics / Compliance Officer | 2024 | $422845 | $377149 | $187463 | N/A | $44845 | $1032302 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler<br> SVP, General<br> Counsel, Corporate Secretary & Chief Ethics / Compliance Officer |  |  |  |  |  |  |  |

---

(1) Amounts earned in the applicable year; includes regular pay, paid time-off, jury duty and holiday pay. The total amounts shown in this column also include any amounts an NEO elected to defer in accordance with the EDC Plan. See the "Non-Qualified Deferred Compensation Plan" table for more information.

(2) Values shown represent the aggregate grant date fair value calculated in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 718 "*Compensation* — *Stock Compensation*" for RSUs and performance share awards granted in each of the years reported. Assumptions used in the calculation of these amounts are included in Note 1 of the Company's audited financial statements for the year ended December 31, 2025, included in the Company's Annual Report on Form 10-K filed with the SEC. In the case of performance share awards tied to TSR, the amounts reported in the Stock Awards column represent the aggregate grant date fair value of the target number of performance shares that may become vested if the applicable performance criteria are satisfied and computed in accordance with ASC 718. The aggregate grant date fair value for the target number of performance shares was calculated by using a Monte Carlo simulation, which produces a probable value for the awards. All performance share awards vest at the end of the vesting term, however the number of shares delivered vary based upon the attained level of performance and may range from 0 to 2.0 times the target number of performance shares awarded. For the 2025 performance share grant, if the maximum level of performance is achieved and using the closing stock price of $38.54 as reported on December 31, 2025, to calculate the value and add the dividend equivalents using an annual amount of $1.96 per share as declared in 2025 multiplied by three years, then the value of the payouts would be: Ms. Rosentrater $4,150,338; Mr. Christie $1,369,557; Mr. Thackston $990,033; Mr. Cox $872,320; and Mr. Hesler $990,033.

(3) Amounts shown represent the annual short-term cash incentive awards paid in 2026 earned by our NEOs for 2025 performance in accordance with the 2025 Cash Incentive Plan.

(4) Any increase in the present value of the accrued pension benefit at normal retirement age (the earliest age at which retirement benefits may be received by the NEO without any reduction in benefits) for any NEO between December 31, 2024, and December 31, 2025, is reported in this column. All NEOs experienced an increase in the present value of their respective accrued pension benefits during 2025. The present value as of December 31, 2025, utilizes the Pri-2012 mortality table with modified MP-2021 generational projection for males and females and a 5.96% discount rate for the retirement plan and a 5.92% discount rate for the SERP. Differences in the present value from year to year are attributable to increases in final average pay, additional service, discount rates fluctuations and mortality assumptions. There were no above-market earnings for the Company's EDC Plan. Mr. Hesler is included in the company's 401(k) plan only based upon his hire date.

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|:---|:---|
| 52.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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EXECUTIVE COMPENSATION TABLES

(5) Includes employer matching contributions under both the EDC Plan and the Investment and Employee Stock Ownership Plan (the "401(k) plan"). The Company makes matching contributions on behalf of all its employees who make regular contributions of their wages, salary, cash incentive, and overtime to the 401(k) plan during the plan year. The Company matching contribution to the 401(k) plan is equal to $0.75 for every $1.00 of regular employee contributions up to a maximum 6% of compensation for non-employees hired prior to January 1, 2006. For non-bargaining employees hired after that date, the Company matching contribution is equal to $1.00 for every $1.00 of regular employee contributions up to a maximum of 6% of compensation. for those non-bargaining employees hired after January 1, 2014, there is an additional enhanced contribution of 3/4/5% based on age. The Company matching contribution under the EDC Plan is equal to $0.75 for every $1.00 contributed up to a maximum of 6% or 100% up to 6% of the executive's base pay less the maximum contribution allowed under the 401(k) plan assuming the participant contributed the maximum allowed by law. Also under the EDC plan, for those hired after 2014, the additional enhanced contribution of 3/4/5% based on age, executive's base pay less the maximum contribution allowed under the 401(k) plan could be contributed to the EDC Plan. Amounts shown in the All Other Compensation column for 2025 include the following:

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| | | | | |
|:---|:---|:---|:---|:---|
| &nbsp;&nbsp; Name | EDC Plan<br>Company<br>Match | 401(k) Plan<br>Company Match | Non-Elective 401(k)<br>Plan Company<br>Contribution | Total All Other<br>Compensation |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater |  | $15750 |  | $15750 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie |  | $15750 |  | $15750 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | $2610 | $15750 |  | $18360 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | $2656 | $15750 |  | $18406 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | $5547 | $21000 | $14000 | $40547 |

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(6) EDC Plan Company Match represents amounts paid in 2025, yet earned in service year 2024. Amounts earned in 2025 will be shown on the 2026 proxy.

CEO Pay Ratio

The Compensation Committee reviewed a comparison of CEO total compensation to the total compensation of the median employee. The compensation for the CEO in 2025 was approximately 23 times the total compensation of our median employee.

In 2023, we identified the median employee by first collecting pay records on all employees from all companies within the corporation including subsidiaries, 1,988 (full-time, part-time, seasonal, and temporary), who were employed by us on December 22, 2023. To determine our median employee, we used a definition that was not annual total compensation, as shown in the 2025 SCT above, and instead chose "base pay rate," which we then annualized as if all employees worked full-time and were employed for all of 2023. We identified 237 employees whose annualized base pay was within a +/-5% range of the median annualized base pay rate. Total cash compensation from 2023 was collected for each of the 237 employees to further narrow down the population. We believe the use of total cash compensation for this group of employees is a consistently applied compensation measure because we do not widely distribute annual equity awards to employees. Fewer than 3% of our employees receive annual equity awards.

In 2025, we used the same median employee as in 2023 and 2024, because there were no changes in our employee population or in our employee compensation package we believe would significantly change this disclosure.

We calculated annual total compensation for the employee using the same methodology we use for our NEOs as set forth in the 2025 SCT above. The annual total compensation for 2025 was $4,773,308 for our CEO and $211,928 for our median employee. The resulting ratio of our CEO's pay to the pay of our median employee for 2025 is 23 to 1.

The foregoing pay ratio disclosure, including but not limited to any assumptions, adjustments, methodologies and existing internal records used to identify our median employee, is a reasonable estimate calculated in a manner consistent with SEC Item 402(u) of Regulation S-K. The SEC rules for identifying the median employee and calculating that employee's annual total compensation allow companies to make reasonable assumptions and estimates, and to apply a variety of methodologies and exclusions reflecting their compensation practices. As a result, the pay ratio reported by other companies may not be comparable to the pay ratio reported above, as other companies may have different compensation practices, and may utilize different assumptions, estimates, methodologies and exclusions in calculating their own pay ratios.

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| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 53.0 |

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Pay vs. Performance ("PvP") Tabular Disclosure — 2025

As required by Section 953(a) of the Dodd-Frank Act, and Item 402(v) of Regulation S-K, we are providing the following information about the relationship between "compensation actually paid" ("CAP") to our CEO and to our other NEOs and certain financial performance metrics of the Company. CAP, as determined under SEC requirements, does not reflect the actual amount of compensation earned by or paid to our executive officers during a covered year. For further information concerning the Company's pay-for-performance philosophy and how the Company aligns executive compensation with the Company's performance, refer to the Compensation Discussion and Analysis.

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| | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | Pay | Pay | Pay | Pay | Pay | Pay | Performance | Performance | Performance | Performance |
| | CEO | CEO | CEO | CEO | Average of Other NEOs | Average of Other NEOs | Value of $100 Initial<br> Investment<br> Based On: | Value of $100 Initial<br> Investment<br> Based On: | | |
| &nbsp;&nbsp;&nbsp;Year<sup>(1)</sup> | SCT Total<br> Comp - CEO | SCT Total<br> Comp - Prior<br> CEO | Compensation<br> Actually<br> Paid<sup>(2)</sup> - CEO | Compensation<br> Actually<br> Paid<sup>(2)</sup> - Prior<br> CEO | SCT Total<br> Compensation | Compensation<br> Actually<br> Paid<sup>(2)</sup> | Cumulative<br> TSR | Peer<br> Group<br> Cumulative<br> TSR<sup>(3)</sup> | Net<br> Income<br> ($M) | EPS |
| 2025 | $4773308 |  | $5685935 |  | $1699924 | $1198870 | $121 | $145 | $192.0 | $2.76 |
| 2024 |  | $4977194 |  | $5047454 | $1340034 | $1363893 | $110 | $119 | $180.1 | $2.39 |
| 2023 |  | $5229962 |  | $1552612 | $1137887 | $454110 | $102 | $104 | $171.2 | $2.24 |
| 2022 |  | $4745379 |  | $5290632 | $1318402 | $1605440 | $120 | $119 | $155.2 | $2.12 |
| 2021 |  | $4577539 |  | $3485983 | $1257052 | $1082031 | $110 | $118 | $147.3 | $2.10 |

---

(1) The CEO in reporting years 2021-2024 was Dennis Vermillion; the current CEO for 2025 is Heather Rosentrater. The other NEOs in the 2024 reporting year were Kevin Christie, Heather Rosentrater, Gregory Hesler, and Jason Thackston. The other NEOs in the 2023 reporting year were Mark Thies (ret.), Kevin Christie, Heather Rosentrater, Jason Thackston, and Wayne Manuel. The other NEOs in the 2022 and 2021 reporting years were Mark Thies (ret.), Jason Thackston, Heather Rosentrater, and Kevin Christie.

(2) Amounts reported in this column are based upon total compensation reported for our CEO and our other NEOs in the SCT for the indicated reporting years and adjusted as shown in the table below. Fair value of equity awards was computed in accordance with the Company's methodology used for financial reporting purposes.

54 AVISTA CORPORATION • 2026 PROXY STATEMENT

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| | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | 2021 | 2021 | 2022 | 2022 | 2023 | 2023 | 2024 | 2024 | 2025 | 2025 |
| | CEO | Other<br> NEOs | CEO | Other<br> NEOs | CEO | Other<br> NEOs | CEO | Other<br> NEOs | CEO | Other<br> NEOs |
| &nbsp;&nbsp;&nbsp;SCT Reported Compensation | $4577539 | $1257052 | $4745379 | $1318402 | $5229962 | $1137887 | $4977194 | $1340034 | $4773308 | $1699924 |
| &nbsp;&nbsp;&nbsp;Deduct: SCT reported change in pension value | $(905751) | $(170893) | $— | $— | $(1384964) | $(155884) | $(528636) | $(142187) | $(419238) | $(239668) |
| &nbsp;&nbsp;&nbsp;Add: "CAP" pension value | $6658 | $118549 | $3813 | $115378 | $804 | $35117 | $422 | $51637 | $62999 | $56851 |
| &nbsp;&nbsp;&nbsp;Deduct: Grant date fair values of equity awards reported in "Stock Awards" column of the SCT for the covered FY | $(1986445) | $(443078) | $(2923157) | $(642502) | $(2728537) | $(505521) | $(2854069) | $(530051) | $(2653743) | $(718294) |
| &nbsp;&nbsp;&nbsp;Deduct: For any awards granted in any prior FY forfeited during the covered FY, the fair value at the end of the prior FY | $— | $— | $— | $— | $— | $(104376) | $— | $— | $— | $— |
| &nbsp;&nbsp;&nbsp;Add: Fair values as of the end of the covered FY of all equity awards granted during the covered FY outstanding and unvested as of the end of such covered FY | $1865542 | $416058 | $2626495 | $577278 | $1767071 | $242652 | $3213321 | $596766 | $3742943 | $414596 |
| &nbsp;&nbsp;&nbsp;Add: The change in fair value (whether positive or negative) as of the end of the covered FY of any equity awards granted in any prior FY outstanding and unvested as of the end of such covered FY | $(192645) | $(63103) | $268274 | $61234 | $(1518971) | $(240617) | $(454563) | $(77953) | $(364976) | $(202047) |
| &nbsp;&nbsp;&nbsp;Add: For awards granted and vested in the same FY, the fair value as of the vesting date | $179733 | $40100 | $217488 | $63451 | $227735 | $58177 | $314212 | $58361 | $294407 | $91436 |
| &nbsp;&nbsp;&nbsp;Add: The change in fair value (whether positive or negative) as of the vesting date of any awards granted in any prior FY for which all applicable vesting conditions were satisfied at the end of or during the covered FY | $(197784) | $(108165) | $119893 | $60392 | $(183866) | $(36344) | $164104 | $27739 | $52257 | $37173 |
| &nbsp;&nbsp;&nbsp;Add: The dollar value of any dividend equivalents or other earnings paid on stock or option awards in the covered FY prior to the vesting date not otherwise reflected in the fair value of such award | $139135 | $35511 | $232446 | $51807 | $143377 | $23019 | $215470 | $39548 | $197978 | $58899 |
| &nbsp;&nbsp;&nbsp;Total Compensation Actually Paid | $3485983 | $1082031 | $5290632 | $1605440 | $1552612 | $454110 | $5047454 | $1363893 | $5685935 | $1198870 |

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(3) Amounts reported in this column represent returns on an initial $100 investment in the S&P 400 Utilities Index, which we chose as peer group for purposes of the PvP table.

AVISTA CORPORATION • 2026 PROXY STATEMENT 55

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EXECUTIVE COMPENSATION TABLES

Most Important Measures Linking Avista NEO Pay to Performance — 2025

The following are the most important financial and non-financial performance measures, as determined by the Company, that link compensation actually paid to our NEOs to the Company's performance for the most recently completed fiscal year.

• Earnings per Share ("EPS")

• 3-Year Relative TSR

• Cost Per Customer

Compensation Actually Paid vs. Most Important Measures — 2025

The graphs below describe the relationship between compensation actually paid to our NEOs and the Company's cumulative Total Shareholder Return, net income, and EPS for the indicated years. In addition, the graph of CAP vs. TSR below compares the Company's cumulative TSR and our peer group cumulative TSR.

![LOGO](g853530g20a01.jpg)

56 AVISTA CORPORATION • 2026 PROXY STATEMENT

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EXECUTIVE COMPENSATION TABLES

![LOGO](g853530g20a02.jpg)

![LOGO](g853530g20a03.jpg)

AVISTA CORPORATION • 2026 PROXY STATEMENT 57

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EXECUTIVE COMPENSATION TABLES

Grants of Plan-Based Awards — 2025

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| | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | Grant<br>Date<sup>(1)</sup> | Estimated Possible Payouts<br>Under Non-Equity Incentive<br>Plan Awards<sup>(2)</sup> | Estimated Possible Payouts<br>Under Non-Equity Incentive<br>Plan Awards<sup>(2)</sup> | Estimated Possible Payouts<br>Under Non-Equity Incentive<br>Plan Awards<sup>(2)</sup> | Estimated Future Payouts<br>Under Equity Incentive Plan<br>Awards<sup>(3)</sup> | Estimated Future Payouts<br>Under Equity Incentive Plan<br>Awards<sup>(3)</sup> | Estimated Future Payouts<br>Under Equity Incentive Plan<br>Awards<sup>(3)</sup> | All Other<br>Stock Awards:<br>Number of Shares<br>of Stock or Units<br>(#)<sup>(4)</sup> | Grant Date<br>Fair Value of<br>Stock and Option<br>Awards<br>($)<sup>(5)</sup> |
| &nbsp;&nbsp; Name | Grant<br>Date<sup>(1)</sup> | Threshold<br>($) | Target<br>($) | Maximum<br>($) | Threshold<br>(#) | Target<br>(#) | Maximum<br>(#) | All Other<br>Stock Awards:<br>Number of Shares<br>of Stock or Units<br>(#)<sup>(4)</sup> | Grant Date<br>Fair Value of<br>Stock and Option<br>Awards<br>($)<sup>(5)</sup> |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 | $496000 | $800000 | $1200000 |  |  |  |  |  |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 5206 | 10412 | 20824 |  | 463750 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 18153 | 36305 | 72610 |  | 1342559 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  |  |  |  | 22916 | 847434 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 | $176700 | $285000 | $427500 |  |  |  |  |  |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 1420 | 2840 | 5680 |  | 126494 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 6288 | 12576 | 25152 |  | 465060 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  |  |  |  | 8922 | 329936 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 | $155124 | $250200 | $375300 |  |  |  |  |  |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 971 | 1941 | 3882 |  | 86452 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 4602 | 9203 | 18406 |  | 340327 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  |  |  |  | 6705 | 247951 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 | $142104 | $229200 | $343800 |  |  |  |  |  |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 805 | 1610 | 3220 |  | 71709 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 4105 | 8209 | 16418 |  | 303569 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  |  |  |  | 6137 | 226946 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 | $166656 | $268800 | $403200 |  |  |  |  |  |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 971 | 1941 | 3882 |  | 86452 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  | 4602 | 9203 | 18406 |  | 340327 |
| &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler<br> Annual Cash Award<br> Performance Award<br> Performance Award<br> Restricted Stock Units | 02/12/25 |  |  |  |  |  |  | 6705 | 247951 |

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(1) The grant date is the date the Compensation Committee and/or the Board approves the grant of performance share awards, RSUs or non-equity incentive awards.

(2) Potential annual cash incentive awards granted to NEOs for 2025 performance in accordance with the 2025 Cash Incentive Plan. The amounts actually paid to our NEOs for 2025 performance appear in the Non-Equity Incentive Plan Compensation column of the SCT. See the CD&A for further explanation.

(3) Performance share awards are granted under the LTIP and vest over a three-year period. The number of shares earned at the end of the three-year performance period depends on the level of performance achieved. See the CD&A for further explanation.

(4) In 2025, all of our NEOs were awarded RSUs under the LTIP that vest over a three-year period. One-third of the shares vest and shares are issued on an annual basis, provided that the NEO is employed on the last day of the vesting period. Dividend equivalents accrue on the unvested RSUs and are paid in cash at the same time the underlying RSUs vest. Therefore, if an NEO's employment ends prior to the last day of the vesting period, no RSUs or dividend equivalents are earned or paid.

(5) The amounts shown for the grant date fair value of the target number of performance share awards tied to TSR were calculated in accordance with ASC 718. Assumptions used in the calculation of these amounts are included in Note 1 of the Company's audited financial statements for the year ended December 31, 2025, included in the Company's Form 10-K filed with the SEC in February 2026. The grant date fair value for the target number of performance shares tied to TSR was calculated using a Monte Carlo simulation to produce a probable value for the awards, which resulted in a fair value per share higher than the closing price per share on the grant date.

Employment Agreements

We currently do not have employment agreements with our NEOs. Please refer to the "Pension Benefits" Table for a discussion of the provisions that relate to the grant of additional vesting service credit for pension purposes, and to the "Potential Payments Upon Termination or Change in Control" tables for a discussion of the change in control provisions.

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| | |
|:---|:---|
| 58.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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##### [**Table of Contents**](#toc)
EXECUTIVE COMPENSATION TABLES

Outstanding Equity Awards at Year-End — 2025<sup>(1)</sup>

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | Date of<br>Grant | Stock Awards | Stock Awards | Stock Awards | Stock Awards |
| &nbsp;&nbsp; Name | Date of<br>Grant | Number of<br>Shares or<br>Units of Stock<br>Not Vested<br>(#)<sup>(2)</sup> | Market Value<br>of Shares or<br>Units of Stock<br>Not Vested<br>($)<sup>(3)</sup> | Equity Incentive<br>Plan Awards:<br>Number of<br>Unearned<br>Shares, Units,<br>or Other Rights<br>Not Vested<sup>(4)</sup> | Equity Incentive<br>Plan Awards:<br>Market or<br>Payout Value of<br>Unearned<br>Shares, Units,<br>or Other Rights<br>Not Vested<br>($)<sup>(4)</sup> |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 02/07/24 |  |  | 16086 | 619954 |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 02/07/24 | 2297 | 88526 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 02/12/25 |  |  | 46717 | 1800473 |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 02/12/25 | 15277 | 588776 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 02/07/24 |  |  | 11796 | 454618 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 02/07/24 | 1685 | 64940 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 02/12/25 |  |  | 15416 | 594133 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 02/12/25 | 5948 | 229236 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 02/07/24 |  |  | 8795 | 338959 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 02/07/24 | 1255 | 48368 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 02/12/25 |  |  | 11144 | 429490 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 02/12/25 | 4470 | 172274 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 02/07/24 |  |  | 7079 | 272825 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 02/07/24 | 1010 | 38925 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 02/12/25 |  |  | 9819 | 378424 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 02/12/25 | 4091 | 157667 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 02/07/24 |  |  | 7936 | 305853 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 02/07/24 | 1133 | 43666 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 02/12/25 |  |  | 11144 | 429490 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 02/12/25 | 4470 | 172274 |  |  |

---

(1) All of the 2023-2025 awards were settled at the end of 2025. Please see the "Stock Vested 2025" table for more information.

(2) Number of time-based RSUs unvested as of December 31, 2025. (RSUs vest and shares are issuable over a three-year period, provided the NEO remains employed on the last day of each year of the vesting period.)

(3) The market value of RSUs is based on the closing stock price ($38.54) as reported on December 31, 2025.

(4) Performance share awards reflect the number of performance shares at the target performance level. The market value is based on the closing stock price ($38.54) as reported on December 31, 2025. The value for the 2024 performance share award is shown at the target level (100%) based on results (less than target) for the first two years of the 2024-2026 performance period. The values for the 2025 performance share awards are shown at the target level (100%) based on results (at target) for the first year of the 2025-2027 performance period.

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| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 59.0 |

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##### [**Table of Contents**](#toc)
EXECUTIVE COMPENSATION TABLES

Stock Vested — 2025

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| | | |
|:---|:---|:---|
|  | Stock Awards<sup>(1)(2)</sup> | Stock Awards<sup>(1)(2)</sup> |
| &nbsp;&nbsp; Name | Number of Shares<br>Acquired on Vesting<br>(#) | Value Realized<br>on Vesting<br>($) |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | —<sup>(1)</sup> | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 2752<sup>(2)</sup> | $109860 |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 1310<sup>(3)</sup> | $51025 |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 2297<sup>(3)</sup> | $89468 |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | 7639<sup>(3)</sup> | $297539 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | —<sup>(1)</sup> | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 2724<sup>(2)</sup> | $108742 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 1295<sup>(3)</sup> | $50440 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 1685<sup>(3)</sup> | $65631 |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | 2974<sup>(3)</sup> | $115837 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | —<sup>(1)</sup> | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 2052<sup>(2)</sup> | $81916 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 976<sup>(3)</sup> | $38015 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 1256<sup>(3)</sup> | $48921 |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | 2235<sup>(3)</sup> | $87053 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | —<sup>(1)</sup> | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 1376<sup>(2)</sup> | $54930 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 654<sup>(3)</sup> | $25473 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 1011<sup>(3)</sup> | $39378 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | 2046<sup>(3)</sup> | $79692 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | —<sup>(1)</sup> | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 1652<sup>(2)</sup> | $65948 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 785<sup>(3)</sup> | $30576 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 1133<sup>(3)</sup> | $44130 |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | 2235<sup>(3)</sup> | $87053 |

---

(1) For the performance period ended December 31, 2025, our TSR ranked in the 8th percentile of our peer group, which is below threshold. As a result, no performance shares granted for the 2023–2025 cycle were earned, and no dividend equivalents were paid.

(2) For the performance period ended December 31, 2025, our cumulative EPS was $6.99, which resulted in issuing 40% of the performance shares granted in 2023 for the 2023-2025 performance period and the related dividend equivalents. On February 9, 2026, the Compensation Committee certified the performance target was met and the shares were issuable. Value is based on the closing stock price ($39.92) as reported on March 2, 2026. Dividend equivalents were paid in cash at the same time the underlying performance shares vested.

(3) Our NEOs were granted RSUs in 2023, 2024 and 2025. One-third of each grant vests each year if an NEO remains employed on December 31. Therefore, one-third of each grant vested. Our NEOs received the last one-third of their RSUs granted in 2023 and one-third of their RSUs granted in 2024 and 2025. The value of all RSUs vested on December 31, 2025, is based on the closing stock price ($38.95) as reported on January 6, 2026, the day on which the shares were issuable to the recipient. Dividend equivalents were paid in cash at the same time the underlying RSUs vested.

Pension Benefits — 2025

The table below reflects benefits accrued under the Retirement Plan for Employees and the two SERPs (for purposes of the discussion below, we refer to both the pre-2005 SERP and the post-2004 SERP as the "SERP") for our NEOs. The Company's Retirement Plan for Employees provides a retirement benefit based upon employees' compensation and years of credited service. The retirement benefit under the Retirement Plan is based on a participant's final average annual base salary for the

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|:---|:---|
| 60.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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##### [**Table of Contents**](#toc)
EXECUTIVE COMPENSATION TABLES

highest 36 consecutive months during the last 120 months of service with the Company. Base salary for our NEOs is the amount under "Salary" in the SCT.

The SERP provides additional pension benefits to executive officers of the Company, who have attained the age of 55 and a minimum of 15 years of vesting service with the Company. The SERP is intended to provide benefits to executive officers whose pension benefits under the Company's Retirement Plan are reduced due to the application of limitations on qualified plans under the Code and the deferral of salary pursuant to the EDC Plan. When combined with the Retirement Plan, the SERP will provide benefits to executive officers, other than our CEO, who retire at age 62 or older, of 2.5% of the final average annual base salary during the highest 60 consecutive months during the last 120 months of service for each credited year of service up to 30 years. When combined with the Retirement Plan, the SERP will provide higher benefits to our CEO, if he or she retires on or after age 65, of 3% of final average base salary during the highest 60 consecutive months during the last 120 months of service for each credited year of service up to 30 years. Benefits will be reduced for executives who retire before age 62. Reductions are either 4% or 5% for each year of retirement before age 62 as prescribed in the Retirement Plan.

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| | | | | |
|:---|:---|:---|:---|:---|
| &nbsp;&nbsp; Name | Plan Name | Number of Years<br>Credited Service<br>(#)<sup>(1)</sup> | Present Value of<br>Accumulated<br>Benefit<br>($) | Payments During<br>Last Year<br>($) |
| &nbsp;&nbsp;&nbsp;&nbsp;H. L. Rosentrater | Retirement Plan | 22.92 | $931547 | $— |
|  | SERP—pre 2005<sup>(2)</sup> | N/A | N/A | $— |
|  | SERP 2005+<sup>(3)</sup> | 22.92 | $570018 | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;K. J. Christie | Retirement Plan | 20.50 | $1142655 | $— |
|  | SERP—pre 2005<sup>(2)</sup> | N/A | N/A | $— |
|  | SERP 2005+<sup>(3)</sup> | 20.50 | $394265 | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | Retirement Plan | 29.50 | $1646512 | $— |
|  | SERP—pre 2005<sup>(2)</sup> | N/A | N/A | $— |
|  | SERP 2005+<sup>(3)</sup> | 29.50 | $1154776 | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | Retirement Plan | 28.08 | $1605551 | $— |
|  | SERP—pre 2005<sup>(2)</sup> | N/A | N/A | $— |
|  | SERP 2005+<sup>(3)</sup> | 28.08 | 168668 | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;G. C. Hesler | Retirement Plan | 10.50 | N/A | $— |
|  | SERP—pre 2005<sup>(2)</sup> | N/A | N/A | $— |
|  | SERP 2005+<sup>(3)</sup> | N/A | N/A | $— |

---

(1) SERP participants are limited to a maximum of 30 years of credited service under the SERP no matter how many years of service they have with the Company.

(2)-(3) Effective January 1, 2005, the SERP was modified to comply with requirements of Code Section 409A. This plan is noted as SERP 2005+. The plan prior to this date, SERP pre-2005, is grandfathered and is not subject to Code Section 409A. SERP pre-2005 benefits were frozen as of December 31, 2004.

(4) Mr. Hesler is not eligible for the pension and/or SERP benefit.

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| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 61.0 |

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##### [**Table of Contents**](#toc)
EXECUTIVE COMPENSATION TABLES

Non-Qualified Deferred Compensation Plan — 2025

The following table shows the non-qualified deferred compensation activity for our NEOs accrued through December 31, 2025:

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp; Name | Executive<br>Contributions<br>in Last Fiscal Year<br>($)<sup>(1)</sup> | Registrant<br>Contributions<br>in Last Fiscal Year<br>(Company Match)<br>($)<sup>(2)</sup> | Aggregate<br>Earnings<br>in Last Fiscal Year<br>($)<sup>(3)</sup> | Aggregate<br>Withdrawals/<br>Distributions<br>($) | Aggregate<br>Balance at<br>Last Fiscal<br>Year-End<br>($) |
| &nbsp;&nbsp;&nbsp;&nbsp;J. R. Thackston | $11682 | $2610 | $210934 | $— | $1635564 |
| &nbsp;&nbsp;&nbsp;&nbsp;B. A. Cox | $3178 | $2656 | $5735 | $(16433) | $42845 |

---

(1) Eligible employees may elect to defer up to 75% of their base annual salary and up to 100% of their annual bonus. This column represents deferrals of this compensation during the last year. See the SCT for further explanation.

(2) The Company matching contribution under the EDC Plan is equal to $0.75 for every $1.00 contributed up to a maximum of 6%, (or $1 for every $1.00 contributed up to a maximum of 6% for executive hired after 2006), of the executive's base pay less the maximum contribution allowed under the 401(k) plan assuming the participant contributed up to the limit set forth in Code Section 402(g) for the plan year. Also, under the EDC plan, for executives hired after 2014, the additional enhanced contribution of 3/4/5% based on age executive base pay less the maximum contribution allowed under the 401(k) plan could be contributed to the EDC plan. See "All Other Compensation" column of the SCT for further explanation.

(3) Earnings reflect the market returns of the NEO's investment allocations. The earnings accrued for deferred compensation are determined by actual earnings of Avista common stock and selected mutual funds. None of the earnings are included as compensation on the SCT since none are above market earnings. The Compensation Committee selects the mutual funds available for investment under the EDC Plan, and the participants may allocate their accounts among these investments, including Avista common stock.

Potential Payments Upon Termination or Change in Control

Effective January 1, 2020, the Company's CIC Plan covers all NEOs and replaced individual CIC agreements in effect on December 31, 2019 for our NEOs who had such agreements. Under the CIC Plan, the cash component is paid in a lump sum and is based on a multiple of the sum of base salary and annual bonus. No participant in the CIC Plan is eligible to receive cash severance in excess of the sum of (i) pro-rated annual bonus plus (ii) a multiple greater than three times base salary and annual bonus. The CIC Plan has a double trigger providing for a severance payment only upon the occurrence of both a CIC and a termination of the NEO's employment within two years thereafter either by the Company without "Cause" or by the NEO for "Good Reason" (each as defined in the CIC Plan). Good Reason includes a material diminution in the executive officer's authority, duties or responsibilities material diminution in the executive's annual salary or bonus opportunity, or material relocation of the executive officer's principal place of employment by more than 50 miles.

The CIC Plan also provides compensation and benefits to our NEOs during employment following a CIC of the Company. Pursuant to the terms of the CIC Plan, during the two years following a CIC of the Company, an NEO will receive an annual base salary no less than as in effect immediately prior to the CIC. In addition, each NEO will receive an annual bonus no less than the NEO's target annual incentive as in effect immediately prior to the CIC.

If employment is terminated by the Company without Cause or by such executive officer for Good Reason during the first two years after a CIC, the executive officer will receive: (i) the earned but unpaid base salary due to such executive officer as of the date of termination; (ii) any earned but unpaid annual bonus; (iii) any accrued, unused vacation pay; (iv) a pro-rated target annual bonus due to such executive officer for the portion of the year worked prior to the termination; (v) a lump sum payment equal to two or three times (depending on the officer's level) the sum of the NEO's annual base salary and the target annual bonus; and (vi) reimbursement of COBRA continuation coverage premiums for up to 18 months.

For Code Sections 280G and 4999 and excise taxes thereunder, the CIC Plan provides no gross up for such taxes. The CIC Plan provides that the NEO will receive the greater of, on an after-tax basis, the full amount of CIC benefits subject to the excise tax or a reduced amount equal to the maximum amount of CIC benefits that could be paid without triggering the 280G excise tax.

The excise tax amount in the tables below is based on the Company's estimate of the individual's liabilities under Code Sections 280G and 4999, assuming the NEO was terminated in connection with a CIC on December 31, 2025.

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|:---|:---|
| 62.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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##### [**Table of Contents**](#toc)
EXECUTIVE COMPENSATION TABLES

The Board may amend or terminate the CIC Plan at any time, provided any amendment or termination will not take effect for 12 months following the date of such Board action. The Board may not, prior to a CIC, amend the Plan in a manner adversely affecting any participant's eligibility to participate in the CIC Plan or payments or benefits thereunder.

If employment terminates for any reason other than for retirement, death or disability during a performance cycle, all performance-based awards are forfeited. If employment terminates due to retirement, death or disability, the payment amount is still determined at the end of the three-year performance cycle and is prorated based on the number of months of active service during the cycle. If employment terminates in connection with a CIC, RSUs are fully accelerated and performance shares have prorated acceleration based on target performance.

Participation in the CIC Plan is subject to various conditions including, but not limited to: (i) agreement to maintain confidence as to participation in the Plan and terms of the Plan, as well as the Company's business plans and strategies and other information that is not common knowledge, (ii) a general release of liability for any and all claims relating to or arising out of, among other things, the participant's employment or the termination of employment and (iii) a general non-disparagement agreement.

The charts below assume a CIC occurred and a termination thereafter occurred on December 31, 2025.

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| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> |
| | Termination<br>Without Cause or<br>With Good Reason<br>after a CIC | Voluntary<br>Termination | Retirement | Death | Disability | Involuntary<br>Termination<br>With or Without<br>Cause |
| &nbsp;&nbsp; ***Heather L. Rosentrater*** |  |  |  |  |  |  |
| &nbsp;&nbsp; President and CEO |  |  |  |  |  |  |
| &nbsp;&nbsp; ***Compensation Components*** |  |  |  |  |  |  |
| &nbsp;&nbsp; Severance<sup>(2)</sup> | $5600000 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Value of Accelerated Equity<sup>(3)</sup> | $2692110 | $— | $2085977 | $2085977 | $2085977 | $— |
| &nbsp;&nbsp; Retiree Medical<sup>(4)</sup> | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Health Benefits<sup>(5)</sup> | $52554 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Death Benefit<sup>(6)</sup> | $— | $— | $— | $1600000 | $— | $— |
| &nbsp;&nbsp; Supplemental Disability Benefit<sup>(7)</sup> | $— | $— | $— | $— | $3882632 | $— |
| &nbsp;&nbsp; Section 280G Tax Gross-Up | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ***Total*** | $8344664 | $— | $2085977 | $3685977 | $5968609 | $— |

---

(1) All scenarios assume termination occurred on December 31, 2025, and a stock price of $38.54, the closing price of Company stock on that date.

(2) 3x the sum of the executive's annual base pay and target bonus, plus an amount equal to target bonus.

(3) For CIC, pro-rated FY23-25, FY24-26 and FY25-27 PSUs (assumes target performance) plus full acceleration of unvested RSUs and applicable dividend equivalents.

(4) Retiree medical benefits are generally available to all employees who meet age and service eligibility requirements.

(5) 18 months of health benefits continuation, based on 2025 premium amounts.

(6) The "death benefit" is explained in the CD&A under "Company Self-Funded Death Benefit Plan." Amount shown is twice the annual base salary and is paid in a lump sum.

(7) The supplemental disability benefit is 60% of base annual pay and is comprised of benefits available from the Avista Supplemental Executive Disability Plan, Long-term Disability Plan, Workers Compensation (if applicable), and Social Security. Amount shown is the present value of the annual disability benefit payable to age 65. Present value was determined by using an interest rate of 6.19% and the Pri-2012 mortality table with modified MP-2021 generational projection for males and females.

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| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 63.0 |

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##### [**Table of Contents**](#toc)
EXECUTIVE COMPENSATION TABLES

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| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> |
| | Termination<br>Without Cause or<br>With Good Reason<br>after a CIC | Voluntary<br>Termination | Retirement | Death | Disability | Involuntary<br>Termination<br>With or Without<br>Cause |
| &nbsp;&nbsp; ***Kevin J. Christie*** |  |  |  |  |  |  |
| &nbsp;&nbsp; SVP, CFO, Treasurer & Regulatory Affairs Officer |  |  |  |  |  |  |
| &nbsp;&nbsp; ***Compensation Components*** |  |  |  |  |  |  |
| &nbsp;&nbsp; Severance<sup>(2)</sup> | $1805000 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Value of Accelerated Equity<sup>(3)</sup> | $1491584 | $— | $1211719 | $1211719 | $1211719 | $— |
| &nbsp;&nbsp; Retiree Medical<sup>(4)</sup> | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Health Benefits<sup>(5)</sup> | $39084 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Death Benefit<sup>(6)</sup> | $— | $— | $— | $950000 | $— | $— |
| &nbsp;&nbsp; Supplemental Disability Benefit<sup>(7)</sup> | $— | $— | $— | $— | $1025711 | $— |
| &nbsp;&nbsp; Section 280G Tax Gross-Up | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ***Total*** | $3335668 | $— | $1211719 | $2161719 | $2237430 | $— |

---

(1) All scenarios assume termination occurred on December 31, 2025, and a stock price of $38.54, the closing price of Company stock on that date.

(2) 2x the sum of the executive's annual base pay and target bonus, plus an amount equal to target bonus.

(3) For CIC, pro-rated FY23-25, FY24-26 and FY25-27 PSUs (assumes target performance) plus full acceleration of unvested RSUs and applicable dividend equivalents.

(4) Retiree medical benefits are generally available to all employees who meet age and service eligibility requirements.

(5) 18 months of health benefits continuation, based on 2025 premium amounts.

(6) The "death benefit" is explained in the CD&A under "Company Self-Funded Death Benefit Plan." Amount shown is twice the annual base salary and is paid in a lump sum.

(7) The supplemental disability benefit is 60% of base annual pay and is comprised of benefits available from the Avista Supplemental Executive Disability Plan, Long-term Disability Plan, Workers Compensation (if applicable), and Social Security. Amount shown is the present value of the annual disability benefit payable to age 65. Present value was determined by using an interest rate of 6.19% and the Pri-2012 mortality table with modified MP-2021 generational projection for males and females.

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| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> |
| | Termination<br>Without Cause or<br>With Good Reason<br>after a CIC | Voluntary<br>Termination | Retirement | Death | Disability | Involuntary<br>Termination<br>With or Without<br>Cause |
| &nbsp;&nbsp; ***Jason R. Thackston*** |  |  |  |  |  |  |
| &nbsp;&nbsp; SVP, Growth, Energy Policy & External Relations |  |  |  |  |  |  |
| &nbsp;&nbsp; ***Compensation Components*** |  |  |  |  |  |  |
| &nbsp;&nbsp; Severance<sup>(2)</sup> | $1394165 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Value of Accelerated Equity<sup>(3)</sup> | $1112425 | $— | $903189 | $903189 | $903189 | $— |
| &nbsp;&nbsp; Retiree Medical<sup>(4)</sup> | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Health Benefits<sup>(5)</sup> | $52554 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Death Benefit<sup>(6)</sup> | $— | $— | $— | $834000 | $— | $— |
| &nbsp;&nbsp; Supplemental Disability Benefit<sup>(7)</sup> | $— | $— | $— | $— | $970806 | $— |
| &nbsp;&nbsp; Section 280G Tax Gross-Up | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ***Total*** | $2559144 | $— | $903189 | $1737189 | $1873995 | $— |

---

(1) All scenarios assume termination occurred on December 31, 2025, and a stock price of $38.54, the closing price of Company stock on that date.

(2) 2x the sum of the executive's annual base pay and target bonus, plus an amount equal to target bonus. Thackston's cash amount was reduced by $190,435, to reflect his best net provisions as he would be better off reducing his CIC payout rather than paying the additional excise tax.

---

| | |
|:---|:---|
| 64.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

---

------

##### [**Table of Contents**](#toc)
EXECUTIVE COMPENSATION TABLES

(3) For CIC, pro-rated FY23-25, FY24-26 and FY25-27 PSUs (assumes target performance) plus full acceleration of unvested RSUs and applicable dividend equivalents.

(4) Retiree medical benefits are generally available to all employees who meet age and service eligibility requirements.

(5) 18 months of health benefits continuation, based on 2025 premium amounts.

(6) The "death benefit" is explained in the CD&A under "Company Self-Funded Death Benefit Plan." Amount shown is twice the annual base salary and is paid in a lump sum.

(7) The supplemental disability benefit is 60% of base annual pay and is comprised of benefits available from the Avista Supplemental Executive Disability Plan, Long-term Disability Plan, Workers Compensation (if applicable), and Social Security. Amount shown is the present value of the annual disability benefit payable to age 65. Present value was determined by using an interest rate of 6.19% and the Pri-2012 mortality table with modified MP-2021 generational projection for males and females.

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> |
| | Termination<br>Without Cause or<br>With Good Reason<br>after a CIC | Voluntary<br>Termination | Retirement | Death | Disability | Involuntary<br>Termination<br>With or Without<br>Cause |
| &nbsp;&nbsp; ***Bryan A. Cox*** |  |  |  |  |  |  |
| &nbsp;&nbsp; SVP, Safety & Chief People Officer |  |  |  |  |  |  |
| &nbsp;&nbsp; ***Compensation Components*** |  |  |  |  |  |  |
| &nbsp;&nbsp; Severance<sup>(2)</sup> | $1451600 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Value of Accelerated Equity<sup>(3)</sup> | $893231 | $— | $714364 | $714364 | $714364 | $— |
| &nbsp;&nbsp; Retiree Medical<sup>(4)</sup> | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Health Benefits<sup>(5)</sup> | $52554 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Death Benefit<sup>(6)</sup> | $— | $— | $— | $764000 | $— | $— |
| &nbsp;&nbsp; Supplemental Disability Benefit<sup>(7)</sup> | $— | $— | $— | $— | $813520 | $— |
| &nbsp;&nbsp; Section 280G Tax Gross-Up | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ***Total*** | $2397385 | $— | $714364 | $1478364 | $1527884 | $— |

---

(1) All scenarios assume termination occurred on December 31, 2025, and a stock price of $38.54, the closing price of Company stock on that date.

(2) 2x the sum of the executive's annual base pay and target bonus, plus an amount equal to target bonus.

(3) For CIC, pro-rated FY23-25, FY24-26 and FY25-27 PSUs (assumes target performance) plus full acceleration of unvested RSUs and applicable dividend equivalents.

(4) Retiree medical benefits are generally available to all employees who meet age and service eligibility requirements.

(5) 18 months of health benefits continuation, based on 2025 premium amounts.

(6) The "death benefit" is explained in the CD&A under "Company Self-Funded Death Benefit Plan." Amount shown is twice the annual base salary and is paid in a lump sum.

(7) The supplemental disability benefit is 60% of base annual pay and is comprised of benefits available from the Avista Supplemental Executive Disability Plan, Long-term Disability Plan, Workers Compensation (if applicable), and Social Security. Amount shown is the present value of the annual disability benefit payable to age 65. Present value was determined by using an interest rate of 6.19% and the Pri-2012 mortality table with modified MP-2021 generational projection for males and females.

---

| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 65.0 |

---

------

##### [**Table of Contents**](#toc)
EXECUTIVE COMPENSATION TABLES

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> | Potential Payment Upon Termination After Change in Control<sup>(1)</sup> |
| | Termination<br>Without Cause or<br>With Good Reason<br>after a CIC | Voluntary<br>Termination | Retirement | Death | Disability | Involuntary<br>Termination<br>With or Without<br>Cause |
| &nbsp;&nbsp; ***Gregory C. Helser*** |  |  |  |  |  |  |
| &nbsp;&nbsp; SVP, General Counsel, Corporate Secretary & Chief Ethics/Compliance Officer |  |  |  |  |  |  |
| &nbsp;&nbsp; ***Compensation Components*** |  |  |  |  |  |  |
| &nbsp;&nbsp; Severance<sup>(2)</sup> | $2419200 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Value of Accelerated Equity<sup>(3)</sup> | $1013932 | $— | $814554 | $814554 | $814554 | $— |
| &nbsp;&nbsp; Retiree Medical<sup>(4)</sup> | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Health Benefits<sup>(5)</sup> | $52554 | $— | $— | $— | $— | $— |
| &nbsp;&nbsp; Death Benefit<sup>(6)</sup> | $— | $— | $— | $896000 |  | $— |
| &nbsp;&nbsp; Supplemental Disability Benefit<sup>(7)</sup> | $— | $— | $— | $— | $1624826 | $— |
| &nbsp;&nbsp; Section 280G Tax Gross-Up | $— | $— | $— | $— | $— | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ***Total*** | $3485686 | $— | $814554 | $1710554 | $2439380 | $— |

---

(1) All scenarios assume termination occurred on December 31, 2025, and a stock price of $38.54, the closing price of Company stock on that date.

(2) 3x the sum of the executive's annual base pay and target bonus, plus an amount equal to target bonus.

(3) For CIC, pro-rated FY23-25, FY24-26 and FY25-27 PSUs (assumes target performance) plus full acceleration of unvested RSUs and applicable dividend equivalents.

(4) Retiree medical benefits are generally available to all employees who meet age and service eligibility requirements.

(5) 18 months of health benefits continuation, based on 2025 premium amounts.

(6) The "death benefit" is explained in the CD&A under "Company Self-Funded Death Benefit Plan." Amount shown is twice the annual base salary and is paid in a lump sum.

(7) The supplemental disability benefit is 60% of base annual pay and is comprised of benefits available from the Avista Supplemental Executive Disability Plan, Long-term Disability Plan, Workers Compensation (if applicable), and Social Security. Amount shown is the present value of the annual disability benefit payable to age 65. Present value was determined by using an interest rate of 6.19% and the Pri-2012 mortality table with modified MP-2021 generational projection for males and females.

---

| | |
|:---|:---|
| 66.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

---

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##### [**Table of Contents**](#toc)
PROPOSAL 3: ADVISORY VOTE ON EXECUTIVE COMPENSATION

## Proposal 3

## ADVISORY VOTE ON EXECUTIVE COMPENSATION
What are you voting on?

Shareholders are being asked to approve, on an advisory basis, the compensation of the Company's NEOs.

Voting Recommendation:

---

| | |
|:---|:---|
| ![LOGO](g853530g62i37.jpg)  | <br> THE BOARD UNANIMOUSLY RECOMMENDS A VOTE "FOR" THIS PROPOSAL AND URGES BENEFICIAL OWNERS, IF THEY ARE NOT THE RECORD HOLDERS, TO INSTRUCT THEIR BROKERS OR OTHER NOMINEES TO VOTE FOR PROPOSAL 3. |

---

As required by Section 14A of the Exchange Act, the Board is submitting a separate resolution, to be voted on by shareholders in a non-binding vote, approving, on an advisory basis, the Company's executive compensation.

The text of the resolution in respect of this Proposal 3 is as follows:

"Resolved, that the shareholders approve, on an advisory basis, the compensation of the Company's NEOs as disclosed in the Company's proxy statement, pursuant to the compensation disclosure rules of the SEC, under the "CD&A," "Executive Compensation Tables" and the related narrative disclosure."

The Board recommends a vote for this resolution. As described in this proxy statement under the CD&A, the Company's compensation program is designed to focus Company executives on the achievement of specific annual, long-term and strategic goals set by the Company. The goals are structured to align executives' interests with those of shareholders by rewarding performance that maintains and improves shareholder value. The following features of the compensation structure reflect this approach:

• Executive compensation programs have both short- and long-term components.

• Annual cash incentive components focus on both the actual results and the sustainability and quality of those results.

• The total compensation program does not provide for guaranteed bonuses and has multiple performance measures.

• The Company has a recoupment policy that authorizes the Board to recover incentive payouts based on performance results that are subsequently revised or restated to levels that would have produced payouts lower than the original incentive plan payouts. The recoupment policy includes up to three years of incentive compensation if an officer engages in detrimental conduct.

• The CIC Plan, which became effective January 1, 2020 and requires a double trigger for benefits, replaced individual CIC agreements for current officers who had such agreements and eliminated the tax gross-up provision.

The Board believes the Company's current executive compensation program properly focuses our executives on the achievement of specific annual, long-term and strategic goals. The Board also believes the Company's executive compensation program properly aligns the executives' interests with those of shareholders.

---

| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 67.0 |

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##### [**Table of Contents**](#toc)
PROPOSAL 3: ADVISORY VOTE ON EXECUTIVE COMPENSATION

Shareholders are urged to read the CD&A section of this proxy statement, which discusses in greater detail how the Company's compensation program implements the specific goals set by the Company.

---

| | |
|:---|:---|
| ![LOGO](g853530g62i37.jpg)  | THE BOARD RECOMMENDS A VOTE "FOR" THE APPROVAL, ON AN ADVISORY BASIS, OF THE COMPENSATION OF THE COMPANY'S NEOS. |

---

Although the advisory vote on Proposal 3 is non-binding, the Board and the Compensation Committee will review the results of the vote and, consistent with our record of shareholder engagement, are expected to take the outcome of the vote into consideration, along with other relevant factors, in determining future executive compensation and the frequency of such advisory votes.

---

| | |
|:---|:---|
| 68.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

---

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##### [**Table of Contents**](#toc)
PROPOSAL 4: AMENDMENT OF RESTATED ARTICLES OF INCORPORATION TO REDUCE 80% SHAREHOLDER APPROVAL REQUIREMENTS

## Proposal 4

## AMENDMENT OF RESTATED ARTICLES OF INCORPORATION TO REDUCE 80% SHAREHOLDER APPROVAL REQUIREMENTS
What are you voting on?

We are asking our shareholders to approve amendment of the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80% of the total number of shares of common stock outstanding to a majority of such shares outstanding.

Voting Recommendation:

---

| | |
|:---|:---|
| ![LOGO](g853530g62i37.jpg)  | <br> THE BOARD UNANIMOUSLY RECOMMENDS A VOTE "FOR" PROPOSAL 4 TO REDUCE THE 80% SHAREHOLDER APPROVAL REQUIREMENTS AND URGES BENEFICIAL OWNERS, IF THEY ARE NOT THE RECORD HOLDERS, TO INSTRUCT THEIR BROKERS OR OTHER NOMINEES TO VOTE FOR PROPOSAL 4. |

---

The Articles provide that various provisions of the Articles may not be amended or repealed, and inconsistent provisions may not be included in the Articles or Bylaws, without the approval of the holders of 80% of the total number of shares of common stock outstanding. These provisions were adopted as amendments to the Articles in 1987 following approval by the Company's shareholders. The 1987 amendments, which were recommended by the Board of Directors after consultations with financial and legal advisors, generally make it more difficult to obtain control of the Company through transactions that are not approved by the Board of Directors. These provisions include the following:

• The provisions regarding the number of directors, the filling of vacancies and the removal of directors by shareholders;

• The provisions regarding the calling of special meetings of shareholders;

• The "fair price" provision, which requires the approval of holders of 80% of the total number of shares of common stock outstanding for asset sales, mergers and certain other transactions with an Interested Shareholder (generally, a holder of 10% of the outstanding shares of common stock) unless certain conditions are met;

• The provisions regarding the adoption, alteration, amendment, change and repeal of the Bylaws of the Company;

• The provisions of the Bylaws of the Company relating to procedures for the nomination of Directors; and

• Each provision requiring such 80% approval.

Proposal 4 would amend these provisions of the Articles to reduce the 80% shareholder approval requirement for amendment or repeal and, in the case of the "fair price" provision, for a transaction with an Interested Shareholder, to a majority of the outstanding shares of common stock, consistent with Washington law. Proposal 4 would also clarify that such provisions of the Articles do not impose any shareholder approval requirement in addition to the requirements, if any, of Washington law with respect to any such amendment, repeal or transaction that is approved by the Board. If Proposal 4 is approved, the Board will amend provisions of the Bylaws that may be inconsistent therewith or no longer necessary.

---

| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 69.0 |

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##### [**Table of Contents**](#toc)
PROPOSAL 4: AMENDMENT OF RESTATED ARTICLES OF INCORPORATION TO REDUCE 80% SHAREHOLDER APPROVAL REQUIREMENTS

VOTE AT PREVIOUS ANNUAL MEETINGS

The same proposed amendments to the Articles, among others, were considered at the Annual Meetings held from 2012 through 2017, and these proposed amendments were approved by holders of percentages of the outstanding shares of common stock ranging from 68.79% to 75.41%. However, the amendments were not adopted since in each case the affirmative vote fell short of the 80% approval requirement.

The Board believes the failure to obtain the required 80% approval at prior Annual Meetings is mainly due to the fact that, under NYSE rules, brokers and other nominees are not permitted to vote on this proposal without instructions from the beneficial owners and that many beneficial owners simply failed to give their instructions on how to vote on the proposal.

However, due to the high approval percentages for these proposed amendments at the Annual Meetings held from 2012 through 2017, and the shareholders' apparent continuing interest in the proposed amendments, as expressed in discussions with certain institutional shareholders, the Board has determined to resubmit these proposed amendments for consideration at the 2026 Annual Meeting.

APPROVAL OF PROPOSAL 4

Under the existing provisions of the Articles, as discussed above, and under Washington law, Proposal 4 would be approved upon the affirmative vote of the holders of 80% of the outstanding shares of common stock.

RECOMMENDATION OF THE BOARD

In light of the apparent views of the Company's shareholders, evidenced by the high approval percentage for this proposal at the 2012, 2013, 2014, 2015, 2016 and 2017 Annual Meetings and expressed by certain institutional shareholders, as well as evolving corporate governance practices generally, the Board has approved this Proposal 4 and believes the Articles should be amended as described above. Accordingly, the Board recommends that the shareholders approve Proposal 4, and urges beneficial owners, if they are not the record holders, to instruct their brokers or other nominees to vote for Proposal 4.

The text of the relevant portions of Article FIFTH, Article SEVENTH and Article EIGHTH of the Articles, as they would be amended if the proposal were adopted, is set forth in the Appendix to this proxy statement.

---

| | |
|:---|:---|
| ![LOGO](g853530g62i37.jpg)  | <br> THE BOARD RECOMMENDS A VOTE "FOR" PROPOSAL 4 TO REDUCE 80% SHAREHOLDER APPROVAL REQUIREMENTS. THE BOARD URGES BENEFICIAL OWNERS TO INSTRUCT THEIR BROKERS OR OTHER NOMINEES TO VOTE "FOR" PROPOSAL 4. |

---

---

| | |
|:---|:---|
| 70.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

---

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##### [**Table of Contents**](#toc)
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

## SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
The following table shows the number of shares of common stock of the Company held beneficially, as of March 2, 2026, by (i) each director and nominee, (ii) each of our NEOs in the Summary Compensation Table, (iii) all current directors and executive officers as a group and (iv) each person who is known to the Company to be the beneficial owner of more than 5% of our common stock. No director or executive officer owns in excess of 1% of the stock of any indirect subsidiaries of the Company. None of the directors or NEOs has pledged Company common stock as security. As of March 13, 2026, there were 82,539,072 shares of common stock outstanding.

Beneficial ownership, as shown below under the heading "Shares Beneficially Owned," was determined in accordance with Rule 13d-3 under the Exchange Act. Under this rule, certain shares may be deemed to be beneficially owned by more than one person (if, for example, persons share the power to vote or the power to dispose of the shares). In addition, shares are deemed to be beneficially owned by a person if the person has the right to acquire shares (for example, upon the exercise of an option or warrant or the vesting of an equity award) within 60 days of the date as of which the information is provided. In computing the percentage ownership of any person, the number of shares is deemed to include the number of shares beneficially owned by such person by reason of such acquisition rights. As a result, the percentage of outstanding shares of any person as shown in the table may not necessarily reflect the person's actual voting power at any particular date.

Shares shown under the heading "Other" are not issued and outstanding and are not considered beneficially owned in accordance with Rule 13d-3 but are considered by the Company in determining whether an individual has met the Company's share ownership guidelines.

To our knowledge, except as indicated in footnotes to the table, the persons named in the table have sole voting and investment power for all shares of common stock shown as beneficially owned by them.

---

| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 71.0 |

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##### [**Table of Contents**](#toc)
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | Shares Beneficially<br>Owned | Shares Beneficially<br>Owned | Other | Other | Total | Percent<br>of<br>Class |
| &nbsp;&nbsp; Name | Direct | Indirect | Deferred<br>Shares<sup>(1)</sup> | RSUs<br>Not Yet<br>Vested<sup>(2)</sup> | Total | Percent<br>of<br>Class |
| &nbsp;&nbsp; Directors and NEOs |  |  |  |  |  |  |
| &nbsp;&nbsp; Julie A. Bentz | 13270 |  |  |  | 13270 | \* |
| &nbsp;&nbsp; Donald C. Burke | 32504 |  |  |  | 32504 | \* |
| &nbsp;&nbsp; Kevin J. Christie | 33268 | 3588<sup>(3)</sup> |  | 12976 | 49832 | \* |
| &nbsp;&nbsp; Bryan A. Cox | 1852 | 10227<sup>(3)</sup> |  | 7589 | 19668 |  |
| &nbsp;&nbsp; Gregory C. Hesler | 16220 |  |  | 8750 | 24970 | \* |
| &nbsp;&nbsp; Kevin B. Jacobsen | 12335 |  |  |  | 12335 | \* |
| &nbsp;&nbsp; Rebecca A. Klein | 27690 |  |  |  | 27690 | \* |
| &nbsp;&nbsp; Sena M. Kwawu | 14877 |  |  |  | 14877 | \* |
| &nbsp;&nbsp; Scott H. Maw | 29847 |  |  |  | 29847 | \* |
| &nbsp;&nbsp; Scott L. Morris | 114409 |  |  |  | 114409 | \* |
| &nbsp;&nbsp; Jeffry L. Philipps | 17395 |  |  |  | 17395 | \* |
| &nbsp;&nbsp; Heather L. Rosentrater | 39335 | 695<sup>(5)</sup> |  | 38797 | 78827 | \* |
| &nbsp;&nbsp; Heidi B. Stanley | 27745 | 9248<sup>(4)</sup> |  |  | 36993 | \* |
| &nbsp;&nbsp; Jason R. Thackston | 35916 |  |  | 8872 | 44788 | \* |
| &nbsp;&nbsp; Janet D. Widmann | 19246 |  |  |  | 19246 | \* |
| &nbsp;&nbsp; All directors and executive officers as a group, including those listed above (22 individuals) | 497036 | 26126 | 3766 | 113502 | 640429 | \* |
| &nbsp;&nbsp; 5% Beneficial Owners |  |  |  |  |  |  |
| &nbsp;&nbsp; BlackRock, Inc.<sup>(6)</sup> | 12339331 |  |  |  | 12339331 | 15.16% |
| &nbsp;&nbsp; The Vanguard Group, Inc.<sup>(7)</sup> | 10777410 |  |  |  | 10777410 | 13.24% |
| &nbsp;&nbsp; State Street Corporation<sup>(8)</sup> | 5309570 |  |  |  | 5309570 | 6.53% |

---

\* Represents less than 1% of the shares outstanding. 

(1) Shares deferred under the EDC Plan or under the former Non-Employee Director Stock Plan.

(2) Time-based RSUs granted to executive officers but not yet vested. RSUs vest in three equal annual increments, provided the officer remains employed by the Company. If the employment of an executive officer terminates, all unvested shares are forfeited.

(3) Shares held in the Company's 401(k) plan.

(4) Shares held by Empire Bolt in a profit-sharing plan not administered by the Company.

(5) Shares held by Ms. Rosentrater's spouse, Eric Rosentrater.

(6) As shown on Schedule 13F-HR filed with the SEC on February 7, 2025, by BlackRock, Inc., a parent holding company, the beneficial owner has sole voting power over 15,259,848 shares, with an aggregate amount beneficially owned by each reporting person is 15,432,248 shares. The mailing address of the beneficial owner is 50 Hudson Yards, New York, New York 10001.

(7) As shown on Schedule 13F-HR filed with the SEC on February 11, 2025, Vanguard has shared voting power over 85,551 shares,with an aggregate amount beneficially owned by each reporting person is 10,260,857. The mailing address of the beneficial owner is 100 Vanguard Blvd., Malvern, Pennsylvania 19355.

(8) As shown on Schedule 13F-HR filed with the SEC on February 15, 2025, State Street Corporation ("State Street") has sole voting power over 4,635,481 shares, with an aggregate number of shares beneficially owned of 4,972,982 shares. The mailing address is State Street Financial Center, 1 Congress Street, Suite 1, Boston, Massachusetts 02114-2016.

---

| | |
|:---|:---|
| 72.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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##### [**Table of Contents**](#toc)
SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

## SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
Section 16 of the Exchange Act requires executive officers, directors and holders of more than 10% of the Company's common stock to file reports of their ownership and changes in their ownership of the Company equity securities with the SEC. Based solely on a review of Forms 3, 4 and 5 furnished to the Company and written representations from certain insiders that no other reports were required, the Company believes all 2025 Section 16 filing requirements applicable to these persons were completed in a timely manner, except for the following:

• Joshua DiLuciano, Vice President of Energy Delivery (sale of stock);

• Dennis Vermillion, then CEO and President (issuance of vested performance shares);

• Jason Thackston, Senior Vice President, Growth, Energy Policy and External Relations (issuance of vested performance shares).

## ANNUAL REPORT AND FINANCIAL STATEMENTS
A copy of the Company's 2025 Annual Report, which contains the Company's audited financial statements, accompanies this proxy statement. Our Annual Report and this proxy statement are also posted on our web site at *https://investor.avistacorp.com*. This Annual Report includes our 2025 Annual Report on Form 10-K filed with the SEC (without exhibits). If you have not received or do not have access to the Annual Report, call our Investor Relations department at (509) 495-4203, and we will send a copy (without exhibits) to you without charge; or send a written request to Avista, Attn: Investor Relations Department, 1411 E. Mission Ave., Spokane, Washington 99202.

## HOUSEHOLDING
The Company understands that, if two or more beneficial owners of our common stock share the same address, the brokerage firm or other intermediary through which these shares are held may, unless contrary instructions are received from any such beneficial owner, deliver a single copy of the proxy statement, annual report and related proxy soliciting materials for all beneficial owners at that address. This procedure is called "householding." Beneficial owners of common stock who currently receive multiple copies of the proxy statement, annual report and other proxy soliciting materials and would prefer "householding" should contact their broker. Beneficial owners subject to "householding" who would prefer to receive separate copies of the proxy soliciting materials for each beneficial owner at their address should contact their broker and revoke their consent to "householding." Alternatively, beneficial owners may request a separate set of the proxy soliciting materials from the Company in writing sent to Avista, Investor Relations, 1411 E. Mission Avenue, Spokane, WA 99202 or by telephone at (509)-495-4203.

The Company and its transfer agent do not engage in "householding" for registered holders of common stock.

## OTHER BUSINESS
The Board does not intend to present any business at the meeting other than as set forth in the accompanying Notice of Annual Meeting and has no present knowledge that others intend to present business at the meeting. If, however, other matters requiring the vote of the shareholders properly come before the meeting or any adjournment(s) thereof, the individuals named in the proxy card will have discretionary authority to vote the proxies held by them in accordance with their judgment as to such matters.

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| | |
|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 73.0 |

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##### [**Table of Contents**](#toc)
ADDITIONAL INFORMATION

## ADDITIONAL INFORMATION
About the Annual Meeting

As noted in the Notice of Annual Meeting of Shareholders, the Annual Meeting will be held virtually, solely by live webcast.

WHY AM I RECEIVING THESE MATERIALS AND WHO IS SOLICITING MY VOTE?

In conjunction with the 2026 Annual Meeting, the Board of Directors provided these materials to you, either over the internet or via mail. The Company, on behalf of the Board of Directors, is soliciting your proxy to vote your shares at the 2026 Annual Meeting or at any adjournment or postponement thereof. We solicit proxies to give shareholders of record an opportunity to vote on matters presented at the Annual Meeting. In the proxy statement, you will find information on these matters, which is provided to assist you in voting your shares.

WHAT IS THE PURPOSE OF THE MEETING?

The meeting will be the Company's regular Annual Meeting. You will be voting on the following matters at the Annual Meeting:

(1) Election of eleven directors.

(2) Ratification of the appointment of Deloitte as the Company's independent registered public accounting firm for 2026.

(3) Advisory (non-binding) vote on executive compensation.

(4) Amendment of the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80% of the total number of shares of common stock outstanding to a majority of such shares outstanding.

(5) Transaction of other business that may come before the meeting or any adjournment or postponement thereof.

 <br> How does the Board recommend I vote?<br>The Board recommends a vote:<br>Proposal 1:**For** the election of eleven directors.<br> Proposal 2: **For** ratification of the appointment of Deloitte as the Company's independent registered public accounting firm for 2026.<br> Proposal 3: **For** the advisory (non-binding) vote on executive compensation.<br> Proposal 4: **For** amendment of the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80% of the total number of shares of common stock outstanding to a majority of such shares outstanding.<br>

WHO IS ENTITLED TO VOTE AT THE ANNUAL MEETING?

The Company's common stock is the only class of securities with general voting rights. The Board has set March 13, 2026, as the record date for the Annual Meeting (the "Record Date"). Only shareholders who own common stock at the close of business on the Record Date may attend and vote at the Annual Meeting.

WHAT ARE THE VOTING RIGHTS OF HOLDERS OF COMMON STOCK?

Each share of common stock is entitled to one vote. There is no cumulative voting. At the close of business on the Record Date, 82,539,072 shares of common stock were outstanding and entitled to vote.

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| 74.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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ADDITIONAL INFORMATION

HOW MANY SHARES MUST BE PRESENT TO HOLD THE ANNUAL MEETING?

Under Washington law, action may be taken on matters submitted to shareholders only if a quorum is present. The presence at the virtual meeting of holders of a majority of the shares of common stock outstanding as of the Record Date or their proxies will constitute a quorum. Shares represented by proxy are deemed present for quorum purposes even if abstention is instructed or if no instructions are given. Subject to certain statutory exceptions, once a share is represented for any purpose at a meeting, it is deemed present for quorum purposes for the remainder of the meeting.

HOW DO I VOTE SHARES REGISTERED IN MY NAME?

If you hold shares registered in your name on the Record Date, then you, as the registered holder of those shares, may vote those shares:

BEFORE THE ANNUAL MEETING:

• By completing, dating and signing your proxy card and returning it to the Company by mail in the envelope provided; or

• By telephone or through the internet, following the instructions on your proxy card.

DURING THE ANNUAL MEETING:

• By following the instructions on the website for the meeting — be sure to have your 16-digit control number available.

HOW DO I VOTE SHARES HELD THROUGH A BROKER, BANK OR OTHER NOMINEE?

If you are the beneficial owner of shares held through a broker, bank or other nominee, then you are not a record holder of these shares and may vote them only by instructing the registered holder how to vote them.

You should follow the voting instructions given to you by the broker, bank or other nominee that holds your shares. Generally, you will be able to give your voting instructions by mail, by telephone or through the internet.

The Company's common stock is listed on the NYSE. Under NYSE rules, brokerage firms, banks and other nominees that are members of the NYSE generally have the authority to vote shares when their customers do not give voting instructions. However, NYSE rules prohibit member organizations from voting on certain types of matters without specific instructions from the beneficial owners—if a beneficial owner does not give instructions on such a matter, the member organization cannot vote on that matter. This is called a "broker non-vote." Matters on which NYSE member organizations may not vote without instructions include the election of directors, matters relating to executive compensation and matters relating to certain corporate governance issues. For Avista, this means that NYSE member organizations may not vote on Proposals 1, 3 and 4 unless you have given instructions on how to vote. Please be sure to give specific voting instructions to any broker, bank, or other financial institution that holds your shares so your shares can be voted.

HOW DO I VOTE SHARES HELD THROUGH AN EMPLOYEE PLAN?

If you are the beneficial owner of shares through participation in the Company's 401(k) plan, then you are not the record holder of these shares and may vote them only by instructing the plan trustee or agent how to vote them.

You should follow the voting instructions given to you by the trustee or agent for the 401(k) plan. Generally, you will be able to give your voting instructions by mail, by telephone or through the internet.

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 75.0 |

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ADDITIONAL INFORMATION

HOW CAN I REVOKE MY PROXY OR CHANGE MY VOTE AFTER RETURNING MY PROXY CARD OR GIVING VOTING INSTRUCTIONS?

If you were a registered holder as of the Record Date and returned a proxy card, you may revoke your proxy or change your vote at any time before it is exercised at the Annual Meeting by giving written notice to the Corporate Secretary of the Company. You may also change your vote by timely delivering a later-dated proxy or a later-dated vote by telephone or through the internet.

If you were not a registered holder as of the Record Date and wish to change or revoke your voting instructions, you should follow the instructions given to you by your broker, bank or other financial institution that holds your shares.

HOW MANY VOTES ARE REQUIRED TO ELECT DIRECTORS AND APPROVE THE OTHER PROPOSALS?

PROPOSAL 1 — for the election of directors, a nominee will be elected if the number of votes cast "for" exceeds the number of votes cast "against." Brokers may not vote on this proposal without instructions from the beneficial owner. Abstentions or broker non-votes of any shares will have no effect on the election of a nominee since those shares will not be voted either "for" or "against" that nominee. Likewise, if you are the registered holder (and not a broker) of the shares and sign but give no instructions on the proxy card for a nominee, the shares represented by that proxy card will not be voted either "for" or "against" that nominee and will have no effect on his or her election. Shareholders may not cumulate votes in the election of directors. If an incumbent director does not receive a majority of votes cast for his/her re-election in an uncontested election, he/she would continue to serve a term that would terminate on the date that is the earliest of: (i) the date of the commencement of the term of a new director selected by the Board to fill the office held by such director, (ii) the effective date of the resignation of such director, or (iii) December 31, 2026.

PROPOSAL 2 — the proposal for ratifying the appointment of the firm of Deloitte as the independent registered public accounting firm of the Company for 2026, will be approved if the number of votes cast "for" exceeds the number of votes cast "against." Brokers may vote on this proposal without instructions from the beneficial owner. Abstentions of any shares will have no impact on the outcome of this proposal since those shares will not be voted at all. If you are the registered holder of the shares and sign but give no instructions on the proxy card for this proposal, the shares represented by that proxy card will be voted for this proposal.

PROPOSAL 3 — the advisory (non-binding) vote on executive compensation will be approved if the number of votes cast "for" exceeds the number of votes cast "against." Brokers may not vote on this proposal without instructions from the beneficial owner. Abstentions and broker non-votes of any shares will have no impact on this proposal since those shares will not be voted at all. If you are the registered holder of the shares (and not a broker) and sign but give no instructions on the proxy card for this proposal, the shares represented by that proxy card will be voted for this proposal.

PROPOSAL 4 — the proposal to amend the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80% of the total number of shares of common stock outstanding to a majority of such shares outstanding will be approved if the holders of 80% of the total number of shares of common stock outstanding vote "for" the proposal. Abstentions or broker non-votes with respect to any shares will have the same impact as a vote cast "against". If you are the registered holder of the shares (and not a broker) and sign but give no instructions on the proxy card for this proposal, the shares represented by that proxy card will be voted for this proposal.

WHO PAYS FOR THE PROXY SOLICITATION AND HOW WILL THE COMPANY SOLICIT VOTES?

The expense of soliciting proxies will be borne by the Company. Proxies will be solicited by the Company primarily by mail but may also be solicited personally and by telephone at nominal expense to the Company by directors, officers, and regular employees of the Company. In addition, the Company engaged D.F. King & Co., Inc. at a cost of $8,500 plus out-of-pocket expenses, to solicit proxies in the same manner. The Company will also request banks, brokerage houses, custodians, nominees, and other record holders of the Company's common stock to forward copies of the proxy soliciting materials and the Company's

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| 76.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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ADDITIONAL INFORMATION

2025 Annual Report to the beneficial owners of such stock, and the Company will reimburse such record holders for their expenses in connection therewith.

WHO CAN I CONTACT IF I HAVE QUESTIONS OR NEED ASSISTANCE IN VOTING MY SHARES?

If you have any questions about the proxy voting process, please contact the broker, bank or other financial institution where you hold your shares. You may also contact our Investor Relations Department at (509) 495-4203. Additionally, the SEC has a website (*www.sec.gov/spotlight/proxymatters.shtml*) with more information about your rights as a shareholder.

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|:---|:---|
| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 77.0 |

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2027 ANNUAL MEETING INFORMATION

## 2027 ANNUAL MEETING INFORMATION
General

The 2027 Annual Meeting is currently scheduled for Wednesday, May 12, 2027. Matters to be brought before that meeting by shareholders are subject to the requirements described below.

The date of the 2027 Annual Meeting is subject to change. Any such change, and any resulting change in the dates referred to below, would be specified by the Company in a report filed with the SEC. In addition, any change in the dates referred to below resulting from a change in SEC rules or the Company's Bylaws would be similarly reported by the Company.

Notice of Nominations and Other Business to Be Presented at Annual Meeting

Notice of nominations of directors and other business to be presented by a shareholder at the 2027 Annual Meeting must be delivered to the Company as follows:

• Written notice of a shareholder's intent to nominate a person for election as a director at the 2027 Annual Meeting must be delivered to the principal executive offices of the Company to the attention of the Corporate Secretary on or before February 15, 2027, but not before November 13, 2026, provided, however, that if the shareholder is requesting that the nominee be included in management's proxy soliciting materials, this notice must be delivered no later than December 14, 2026; and

• Written notice of a shareholder's intent to propose other business to be brought before the 2027 Annual Meeting must be delivered to the principal executive offices of the Company to the attention of the Corporate Secretary on or before February 15, 2027, but not before November 13, 2026.

In any case, the written notice of the shareholder must, for the matter to be eligible to be presented at the meeting, comply with all requirements and contain all information specified in the Company's Bylaws, without regard to whether the proposed nomination or other business is to be included in management's proxy soliciting materials or those of any other person.

Notice of Proposals to be Included in Management's Proxy Materials

Proposals shareholders seek to have included in management's proxy soliciting materials must be received by the Corporate Secretary on or before December 2, 2026, and to be so included, must contain the information required by the SEC's Rule 14a-8 and otherwise comply with SEC rules. However, in order for a proposal to be eligible to be presented at the meeting, the shareholder must also comply with all of the requirements specified in the Bylaws for nominating a person for election as a director and/or bringing other business before the meeting.

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| 78.0 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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2027 ANNUAL MEETING INFORMATION

The above information is only a summary of some of the requirements of the advance notice provisions of our Bylaws. If you would like to receive a copy of the provisions of our Bylaws setting forth all of these requirements, you should write to our executive offices, c/o Corporate Secretary.

By Order of the Board,

![LOGO](g853530g04v04.jpg)

Gregory C. Hesler

Senior Vice President, General Counsel,

Corporate Secretary and Chief Ethics/Compliance Officer

Spokane, Washington

April 1, 2026

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | 79.0 |

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APPENDIX A

## APPENDIX A
Proposed Amendments to Restated Articles of Incorporation

The proposed amendments to and restatements of specified provisions of the Restated Articles of Incorporation are set forth below. Text stricken through indicates deletions, and text in italics indicates additions.

ARTICLE FIFTH

The fifth paragraph of Article FIFTH, which relates to the shareholder vote required to amend the provisions of Article FIFTH (which relates to the Board of Directors), would be amended and restated as set forth below:

Notwithstanding anything contained in these Articles of Incorporation to the contrary, the provisions of this Article FIFTH shall not be altered, amended or repealed, and no provision inconsistent therewith shall be included in these Articles of Incorporation or the Bylaws of the Corporation, without the affirmative vote of the holders of at least eighty percent (80%) *a majority* of the voting power of all of the shares of the Voting Stock, voting together as a single class; *it being understood that this paragraph shall not impose any shareholder approval requirement in addition to the requirements, if any, of applicable law with respect to any such alteration, amendment, repeal or inconsistent provision that shall have been approved by the Board of Directors.*

ARTICLE SEVENTH

The existing tenth paragraph of Article SEVENTH, which relates to the shareholder vote required to amend specified provisions of Article SEVENTH, would be amended and restated as set forth below:

Notwithstanding anything contained in these Articles of Incorporation to the contrary, the paragraph in this Article SEVENTH relating to the adoption, alteration, amendment, change and repeal of the Bylaws of the Corporation, the paragraph in this Article SEVENTH relating to the calling and conduct of special meetings of the shareholders and this paragraph, and the provisions of the Bylaws of the Corporation relating to procedures for the nomination of Directors, shall not be altered, amended or repealed, and no provision inconsistent therewith shall be included in these Articles of Incorporation or the Bylaws of the Corporation, without the affirmative vote of the holders of at least eighty percent (80%) *a majority* of the voting power of all the shares of the Voting Stock, voting together as a single class; *it being understood that this paragraph shall not impose any shareholder approval requirement in addition to the requirements, if any, of applicable law with respect to any such alteration, amendment, repeal or inconsistent provision that shall have been approved by the Board of Directors.*

ARTICLE EIGHTH

Subdivision (a) of Article EIGHTH, which relates to specified "Business Combinations," would be amended and restated, in part, to read as set forth below:

a) In addition to any affirmative vote required by law or these Articles of Incorporation, and except as otherwise expressly provided in subdivision (b) of this Article EIGHTH:

[clauses (1), (2), (3), (4) and (5), each of which sets forth a type of transaction that constitutes a "Business Combination" for purposes of Article EIGHTH, would not be changed]

shall require the affirmative vote of the holders of at least 80% *a majority* of the voting power of all of the shares of the Voting Stock, voting together as a single class. Such affirmative vote shall be required notwithstanding the fact that no vote may be required or that the vote of a lower percentage may be specified, by law or in any agreement with any national securities exchange or otherwise. The term "Business Combination" as used in this Article EIGHTH shall mean any transaction which is referred to in any one or more of paragraphs (1) through (5) of this subdivision (a).

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | A-1 |

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APPENDIX A

The last paragraph of Article EIGHTH, which relates to the shareholder vote required to amend the provisions of Article EIGHTH, would be amended and restated to read as set forth below:

Notwithstanding anything contained in these Articles of Incorporation to the contrary, the provisions of this Article EIGHTH shall not be altered, amended or repealed, and no provision inconsistent therewith shall be included in these Articles of Incorporation or the Bylaws of the Corporation, without the affirmative vote of the holders of at least eighty percent (80%) *a majority* of the voting power of all of the shares of the Voting Stock, voting together as a single class; *it being understood that this paragraph shall not impose any shareholder approval requirement in addition to the requirements, if any, of applicable law with respect to any such alteration, amendment, repeal or inconsistent provision that shall have been approved by the Board of Directors.*

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| A-2 | **AVISTA CORPORATION** • **2026 PROXY STATEMENT** |

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APPENDIX B

## APPENDIX B
Non-GAAP Financial Measures

UTILITY EARNINGS PER SHARE (EPS)

This proxy statement includes a discussion of utility EPS. This non-GAAP financial measure represents earnings per share from our Avista Utilities and AEL&P segments, and excludes earnings related to our non-regulated other businesses. This non-GAAP measure is utilized as a target metric in the Company's short-term and long-term incentive plans. For the purposes of setting targets and evaluating performance, Utility EPS also excludes the impact of the Energy Recovery Mechanism ("ERM") in Washington for the short-term incentive, and for the CEPS-based performance share awards granted in 2024 and in 2025.

Management believes the presentation of utility EPS provides useful information to investors, as it provides them with an additional relevant comparison of Avista Corp.'s performance across periods, as well as enhances the understanding of the Company's utility-specific operating performance. Management uses this non-GAAP financial measure for planning and forecasting and for reporting financial results. The most directly comparable GAAP measure for utility EPS is GAAP-reported diluted EPS.

COST PER CUSTOMER

This proxy statement includes a discussion of cost per customer. This non-GAAP measure represents the other operating costs (including operating and maintenance costs), excluding certain regulatory amortizations, pension and retiree medical costs, and other applicable special items, divided by the number of retail customers as of the end of the previous year. This non-GAAP measure is utilized as a target metric in the Company's short-term incentive plan.

The most directly comparable GAAP measure for cost per customer is GAAP-reported other operating expenses.

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| **AVISTA CORPORATION** • **2026 PROXY STATEMENT** | B-1 |

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![LOGO](g853530g03m18.jpg)

![LOGO](g853530g19a20.jpg)

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![LOGO](g853530dsp89.jpg)

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| ![LOGO](g853530dsp89c.jpg)  |  |  |  |  |  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89b.jpg)  |
| ![LOGO](g853530dsp89c.jpg)  | **The Board of Directors recommends you vote FOR the following:** | **The Board of Directors recommends you vote FOR the following:** |  |  |  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89b.jpg)  |
| ![LOGO](g853530dsp89c.jpg)  | 1. Election of Directors |  |  |  |  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89a.jpg)  | ![LOGO](g853530dsp89b.jpg)  |
| ![LOGO](g853530dsp89c.jpg)  | **Nominees** |  | **For** | **Against** | **Abstain** |  |  |  |  |  | ![LOGO](g853530dsp89b.jpg)  |
| ![LOGO](g853530dsp89c.jpg)  | <br> 1a. Julie A. Bentz |  | <br> ☐ | <br> ☐ | <br> ☐ | <br> **The Board of Directors recommends you vote FOR proposals 2, 3 and 4.** |  | <br> **For** | <br> **Against** | <br> **Abstain** | ![LOGO](g853530dsp89b.jpg)  |
| ![LOGO](g853530dsp89c.jpg)  | 1b. Donald C. Burke |  | ☐ | ☐ | ☐ | <br> 2. Ratification of the appointment of Deloitte & Touche LLP as the Company's independent registered public accounting firm for 2026. |  | ☐ | ☐ | ☐ |  |
| ![LOGO](g853530dsp89c.jpg)  | 1c. Kevin B. Jacobsen |  | ☐ | ☐ | ☐ | <br> 2. Ratification of the appointment of Deloitte & Touche LLP as the Company's independent registered public accounting firm for 2026. |  |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  | 1d. Rebecca A. Klein |  | ☐ | ☐ | ☐ | <br> 3. Advisory (non-binding) vote on executive compensation. |  | ☐ | ☐ | ☐ |  |
| ![LOGO](g853530dsp89c.jpg)  | 1e. Sena M. Kwawu |  | ☐ | ☐ | ☐ | <br> 4. Amendment of the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80% of the total number of shares of common stock outstanding to a majority of such shares outstanding. |  | ☐ | ☐ | ☐ |  |
| ![LOGO](g853530dsp89c.jpg)  | 1f. Scott H. Maw |  | ☐ | ☐ | ☐ | <br> 4. Amendment of the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80% of the total number of shares of common stock outstanding to a majority of such shares outstanding. |  |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  | 1g. Scott L. Morris |  | ☐ | ☐ | ☐ | <br> 4. Amendment of the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80% of the total number of shares of common stock outstanding to a majority of such shares outstanding. |  |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  | <br> 1h. Jeffry L. Philipps |  | ☐ | ☐ | ☐ | <br> **NOTE:** The proxies will have discretionary authority to transact such other business as may come before the meeting or any adjournment or postponement thereof. |  |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  | <br> 1i. Heather L. Rosentrater |  | ☐ | ☐ | ☐ | <br> **NOTE:** The proxies will have discretionary authority to transact such other business as may come before the meeting or any adjournment or postponement thereof. |  |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  | <br> 1j. Heidi B. Stanley |  | ☐ | ☐ | ☐ | <br> **NOTE:** The proxies will have discretionary authority to transact such other business as may come before the meeting or any adjournment or postponement thereof. |  |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  | <br> 1k. Janet D. Widmann |  | ☐ | ☐ | ☐ |  |  |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  | <br> Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. | <br> Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. | <br> Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. | <br> Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. | <br> Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. | <br> Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. | <br> Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  |  |  |  |  |  |  |  |  |  |  |  |
| ![LOGO](g853530dsp89c.jpg)  |  |  |  | <br> JOB # |  |  |  |  | SHARES<br> CUSIP #<br> SEQUENCE # | SHARES<br> CUSIP #<br> SEQUENCE # |  |
|  | Signature [PLEASE SIGN WITHIN BOX] | Date |  | <br> JOB # |  | Signature (Joint Owners) | Date |  | SHARES<br> CUSIP #<br> SEQUENCE # | SHARES<br> CUSIP #<br> SEQUENCE # |  |

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| <br> ![LOGO](g853530dsp90a.jpg)  | <br> ![LOGO](g853530dsp90.jpg) <br>This year's Annual Meeting will be a completely virtual meeting of shareholders. You will be able to attend the Annual Meeting, vote and submit questions during the Annual Meeting via the live webcast by visiting <u>www.virtualshareholdermeeting.com/AVA2026</u> |

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**Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting:** The Notice & Proxy Statement, Annual Report is/are available at www.proxyvote.com.

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|  | <br> ![LOGO](g853530dsp90c.jpg)  | **&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PROXY/VOTING INSTRUCTION CARD**<br>**This proxy is solicited on behalf of the Board of Directors of Avista Corporation**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; For the Annual Meeting of Shareholders on Thursday, May 14, 2026** |
| ![LOGO](g853530dsp90b.jpg) <br>| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br> The undersigned hereby appoints Heather L. Rosentrater and Gregory C. Hesler, and each of them, with full power of substitution, the proxies of the undersigned, to represent the undersigned and vote all shares of Avista Corporation Common Stock which the undersigned may be entitled to vote at the Annual Meeting of Shareholders to be held on May 14, 2026, and any adjournment or postponement thereof, as indicated on the reverse side.<br>This proxy, when properly executed, will be voted in the manner directed herein by the undersigned shareholder. **If no direction is given, this proxy will be voted "FOR" item 2 and, if the shares represented hereby are registered in the name of the beneficial owner (and not a broker), will be voted "FOR" items 3 and 4 but will not be voted either "FOR" or "AGAINST" item 1.**<br>If you are a participant in the Avista Investment and Employee Stock Ownership Plan, this proxy covers all shares for which the undersigned has the right to give voting instructions to Vanguard Fiduciary Trust Company, Trustee of that Plan. This proxy, when properly executed, will be voted as directed. If no direction is given to the Trustee by 11:59 p.m. Eastern Time on May 11, 2026, the Trustee will vote the shares held in that plan in the same proportion as votes received from other participants in the plan.<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Continued and to be signed on reverse side** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br> The undersigned hereby appoints Heather L. Rosentrater and Gregory C. Hesler, and each of them, with full power of substitution, the proxies of the undersigned, to represent the undersigned and vote all shares of Avista Corporation Common Stock which the undersigned may be entitled to vote at the Annual Meeting of Shareholders to be held on May 14, 2026, and any adjournment or postponement thereof, as indicated on the reverse side.<br>This proxy, when properly executed, will be voted in the manner directed herein by the undersigned shareholder. **If no direction is given, this proxy will be voted "FOR" item 2 and, if the shares represented hereby are registered in the name of the beneficial owner (and not a broker), will be voted "FOR" items 3 and 4 but will not be voted either "FOR" or "AGAINST" item 1.**<br>If you are a participant in the Avista Investment and Employee Stock Ownership Plan, this proxy covers all shares for which the undersigned has the right to give voting instructions to Vanguard Fiduciary Trust Company, Trustee of that Plan. This proxy, when properly executed, will be voted as directed. If no direction is given to the Trustee by 11:59 p.m. Eastern Time on May 11, 2026, the Trustee will vote the shares held in that plan in the same proportion as votes received from other participants in the plan.<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Continued and to be signed on reverse side** |

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