Unitil Releases Corporate Sustainability and Responsibility Report

Unitil Corporation (NYSE:UTL) (unitil.com) today released its 2023 Corporate Sustainability and Responsibility Report (the “CSR” or the “Report”). The Report highlights the Company’s 2022 successes as well as continuing initiatives into 2023, and outlines progress toward its commitment to environmental sustainability, human capital management, safety and reliability, and customer engagement.

“We are pleased to highlight the key initiatives that demonstrate our deep commitment to the sustainability of our Company, our communities, and our planet,” said Thomas P. Meissner, Jr., Unitil’s Chairman and Chief Executive Officer. “As we transform our business to meet the ever-changing energy needs of future generations, we are firmly committed to sustainability, and we are excited to share our progress.”

Featured topics in the 2023 CSR include progress on:

• Carbon Reduction
• Advancement of Diversity, Equity and Inclusion
• Employee Development and Safety
• Customer Satisfaction and Engagement
• Operational Safety and Reliability

The web-based, interactive, and mobile-responsive CSR aligns with SASB reporting standards, and includes industry-specific metrics in accordance with the American Gas Association and Edison Electric Institute reporting templates for regulated electric and gas utility companies.

To view Unitil’s CSR and learn more about Unitil’s sustainability initiatives, please visit: https://unitil.com/2023-Sustainability-Report.

About Unitil CorporationUnitil Corporation is a public utility holding company with operations in Maine, New Hampshire, and Massachusetts. We provide energy for life by safely and reliably delivering electricity and natural gas in New England. We are committed to the customers we serve and the communities we support, and to developing the people, business practices, and technologies needed to provide dependable and efficient energy service. Together, our operating utilities serve approximately 108,100 electric customers and 87,500 natural gas customers. For more information about our people, technologies, and community involvement please visit unitil.com.

For more information please contact:

Todd Diggins – Investor RelationsPhone: 603-773-6504Email: [e-mail]

Alec O’Meara – External AffairsPhone: 603-773-6404Email: [e-mail]