EVERSOURCE ENERGY

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

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Definitive Proxy Statement

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Soliciting Material under §240.14a-12

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2026 ANNUAL MEETING OF SHAREHOLDERS

Dear Fellow Shareholders:

On behalf of the Board of Trustees and employees of Eversource Energy, it is my pleasure to invite you to attend the 2026 Annual Meeting of Shareholders of Eversource Energy.

Eversource’s team of nearly 11,000 dedicated and engaged employees once again rose to the challenges and opportunities of the utility industry in 2025. Our team continued to provide safe, reliable energy and water service, industry-leading customer service, and timely storm response, as well as generous support for our communities. We invested more than $4 billion into our core businesses in 2025 to improve our already strong reliability and customer service, harden our systems against the impact of extreme weather, prepare for anticipated demand growth, and enable additional clean energy resources to connect to the grid.

We’re deploying innovative technologies and initiatives to support our states’ climate goals and enable electrification and decarbonization. We began construction on the Greater Cambridge Energy Program, a $1.8 billion package of transmission and distribution improvements including a first-of-its-kind underground substation. With Avangrid, we submitted a joint bid into ISO-New England’s competitive request for transmission proposals to bring onshore wind energy from Maine to the broader New England region. We continued our successful pilot of a networked geothermal system in Framingham, Massachusetts, and received federal funding to expand that system. We advanced projects that are part of our Massachusetts Electric Sector Modernization Plan, a roadmap for the investments needed to enable the Commonwealth’s clean energy future, achieve climate goals, and accommodate growth in electric demand. And we began rolling out smart meters in Massachusetts, providing customers with new capabilities to track their energy usage and reduce their bills.

While we continue to invest to keep our systems and service strong and enable the clean energy transition, we recognize that affordability is a major concern among our customers, regulators, and other external stakeholders. We are committed to working with those stakeholders to limit the impact on customers as much as possible. Last year saw significant regulatory turnover in all three of our states, and we are working to build positive, constructive relationships with our new regulatory partners. Eversource remains an industry leader in providing energy efficiency programs that help customers reduce their usage, as well as customer assistance programs. We have also worked to make energy costs more transparent and easier to understand, including implementing a new design for Massachusetts gas bills.

Eversource continues to lead by example in the areas of responsibility and sustainability, and to make progress toward meeting our region’s carbon reduction targets. We maintained top ratings from top sustainability and governance evaluators and built on our company-wide commitment to employee engagement and collaboration with communities.

We are proud to have received independent national recognition for excellence in a variety of areas – as a repeat honoree, in many cases. These honors included Newsweek’s list of Most Responsible Companies; the JUST Capital list of Most JUST Companies; USA Today and Statista’s list of America’s Climate Leaders; and Healthiest Employer’s list of the 100 Healthiest Workplaces in America. We were also honored to receive several awards for hiring veterans, as well as honors from the American Council for an Energy-Efficient Economy.

We continue to focus on moving forward as a pure-play electric and natural gas utility company with attractive opportunities for investment and a long record of strong service to customers.

On behalf of your Board of Trustees, we thank you for your continued support of Eversource Energy.

Very truly yours,

Joseph R. Nolan, Jr.

Chairman of the Board, President and Chief Executive Officer

March 27, 2026

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Notice of Annual

Meeting of Shareholders

Business Items/Agenda

Elect the ten nominees named in the proxy statement as Trustees to hold office until the 2027 Annual Meeting.

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Consider an advisory proposal approving the compensation of our Named Executive Officers.

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Ratify the selection of Deloitte & Touche LLP as our independent registered public accounting firm for 2026.

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Consider a shareholder proposal titled “Independent Board Chairman,” if properly brought before the meeting.

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Consider other matters that may properly come before the meeting.

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Adjournments and Postponements

The business items to be considered at the Annual Meeting may be considered at the meeting or following any adjournment or postponement of the meeting.

Record Date

You or your proxy are entitled to vote at the Annual Meeting or at any adjournment or postponement if you were an Eversource Energy shareholder at the close of business on March 11, 2026.

Voting

Whether or not you plan to attend the Annual Meeting, it is important that your shares be represented at the meeting. For specific instructions on how to vote your shares, please refer to the section entitled “Questions and Answers About the Annual Meeting and Voting” beginning on page 86. This Notice of Annual Meeting of Shareholders and our proxy statement are first being made available to shareholders on or about March 27, 2026.

Meeting Attendance Information

You or your proxy are entitled to attend the Annual Meeting or any adjournment or postponement if you were an Eversource Energy shareholder at the close of business on March 11, 2026 or hold a valid proxy to vote at the Annual Meeting. Please be prepared to present photo identification to be admitted to the meeting. If your shares are not registered in your name but are held in “street name” through a bank, broker or other nominee, and you plan to attend, please bring proof of ownership.

By Order of the Board of Trustees,

March 27, 2026