HARTFORD, Conn. and BOSTON, Mass. (May 22, 2026) – Eversource Energy recently identified unauthorized activity involving employee credentials obtained through phishing and social engineering attacks. Our investigation determined that these malicious efforts enabled limited Company data to be accessed through the compromised accounts of two employees. The activity was promptly identified and blocked, and additional security measures were implemented to further strengthen our cybersecurity systems.

Our investigation confirmed there was no impact to electric, gas or water service, and no intrusion into customer information systems, nor into other critical operational systems or infrastructure. The compromised activity remains blocked, and Eversource continues to monitor the situation and work with law enforcement, as appropriate.

The investigation also determined that some of the Company data accessed included personal information associated with approximately 3,049 former or current customers or household members, representing a very small percentage of our more than 4.6 million customers across our three-state territory.

We have been active in communication with our regulators, as well as local and federal law enforcement regarding this matter. In addition, Eversource has arranged for complimentary two-year credit monitoring and identity theft restoration services for impacted individuals. Customers who may have been affected will receive direct notification with additional information and enrollment instructions.

Eversource takes cybersecurity and the protection of customer information very seriously and will continue to remain vigilant and take appropriate measures to protect against cyber threats and further harden our systems.

Eversource (NYSE: ES), celebrated as a national leader for its commitment to sustainability and corporate citizenship, is named among America’s Most Responsible Companies by Newsweek for 2026 and recognized as the #1 utility on USA Today’s list of America’s Climate Leaders for 2025. Eversource transmits and delivers electricity and natural gas and supplies water to approximately 4.6 million customers in Connecticut, Massachusetts and New Hampshire. The #1 Energy Efficiency Provider in the Nation, Eversource harnesses the commitment of more than 10,500 employees across three states to build a single, united company around the mission of safely delivering reliable energy and water with superior customer service. The company is empowering a clean energy future in the Northeast, with nationally recognized energy efficiency solutions and successful programs to integrate new clean energy resources like a first-in-the-nation networked geothermal pilot project, solar, offshore wind, electric vehicles and battery storage, into the electric system. For more information, please visit eversource.com, and follow us on X, Facebook, Instagram, and LinkedIn. For more information on our water services, visit aquarionwater.com.

CONTACT:
William Hinkle
603-634-2228
william.hinkle@eversource.com