Methane intensity improves by ~13%, a 56% reduction since 2020

Improved personal safety performance across the Company, including a 30% reduction in TRIR from 2023

Activities contributed $1 Billion to state GDPs for a third consecutive year

BIRMINGHAM, Ala., April  03, 2025  (GLOBE NEWSWIRE) -- Diversified Energy Company PLC (LSE: DEC) (NYSE: DEC) ("Diversified," "DEC," or the "Company") is proud to release its sixth annual Sustainability Report, Winning Through Collaboration, highlighting the Company's sustainability actions and achievements in 2024. As the champion of the strategy of managing proved, developed, producing (PDP) assets, Diversified is the only publicly traded company dedicated to this approach, leveraging operational scale, vertical integration, and a proprietary technology platform to drive efficiency and long-term value.

With Diversified’s Smarter Asset Management approach to asset stewardship, combined with the inherent benefits of natural gas, the Company is well-positioned to meet modern energy challenges while delivering the reliable, lower-carbon energy needed to balance growing demand with innovation in energy supply. The report details Diversified's continued progress in advancing operational excellence, reducing environmental impacts, and enhancing employee safety. Key highlights include:

Protecting Our Environment

Reduced methane intensity by ~13% year-over-year to 0.7 MT CO2e per MMcfe; a 56% reduction as compared to 2020 baseline (1.6 MT CO2e per MMcfe)459 pneumatic devices and pumps were eliminated or converted to non-emitting through the work of DEC’s Pneumatics Task Force and individual field teamsConducted 152,000 voluntary emission detection surveys; maintaining a ~98% no-leak rate company-wide on surveyed assetsAchieved a third consecutive year of Oil and Gas Methane Partnership 2.0 (OGMP) Gold Standard

Supporting Our Employees

Improved personal safety performance with a 30% reduction in TRIR while simultaneously realizing a 52% reduction in contractors with a high TRIR scoreOur 2024 motor vehicle incident rate was 0.34 incidents per miles driven, a 38% decrease from 2023 even as we increased our total number of miles driven by nearly 11%Introduced new employee physical and mental wellness programs

Serving Our Communities

Contributed over $1 billion of economic impact to state GDPs through employment and operations for a third consecutive yearStrengthened community outreach efforts to include $2.1 million in community contributions, grants and support programs

More than 25% of community outreach was distributed to socio-economically disadvantaged geographic regions

Commenting on the report, CEO Rusty Hutson, Jr. said:

“Diversified Energy remains committed to delivering reliable, affordable, and sustainable energy. In 2024, our OneDEC culture flourished, empowering our employees to drive innovation, collaborate, and share knowledge, turning ideas into real solutions. Our Sustainability Report highlights our focus on responsible operations, from reducing emissions to safely retiring wells, all while supporting communities and local economies. As the publicly traded PDP Champion, executing the differentiated strategy focused on improving currently producing assets, we are proud to be the Right Company at the Right Time, providing critically needed energy while leading the way in sustainability.”

View the 2024 Sustainability Report online at div.energy/sustainability/

For further information, please contact:

Diversified Energy Company PLC Doug Kris+1 973 856 2757Senior Vice President, Investor Relations & Corporate [email protected]

FTI Consulting U.S. & UK Financial Public [email protected]

About Diversified Energy Company PLC

Diversified is a leading publicly traded energy company focused on natural gas and liquids production, transport, marketing, and well retirement. Through our differentiated strategy, we acquire existing, long-life assets and invest in them to improve environmental and operational performance until retiring those assets in a safe and environmentally secure manner. Recognized by ratings agencies and organizations for our sustainability leadership, this solutions-oriented, stewardship approach makes Diversified the Right Company at the Right Time to responsibly produce energy, deliver reliable free cash flow, and generate shareholder value.