Matrix Service Company Mobilizes on LNG Storage Facility to Supply Back-up Fuel for Dominion Energy’s Greensville and Brunswick County Power Stations

TULSA, OK - May 14, 2025 - Matrix Service Company (Nasdaq: MTRX), a leading contractor to the energy and industrial markets across North America, has announced it has mobilized to site and started civil construction work on a liquefied natural gas (LNG) storage facility to supply back-up fuel for Dominion Energy's Greensville County and Brunswick County Power Stations. This critical milestone follows previous engineering and procurement of necessary equipment.

When complete, the facility will include an LNG production capacity of 180,000 GPD (15 MMscfd) utilizing an amine pretreatment system and nitrogen-cycle refrigeration system, a full containment LNG storage tank with a usable storage capacity of 25 million gallons, a vaporization capacity of 500 MMscfd, and other common support facilities.

"We are very pleased to have been selected by our long-standing client, Dominion Energy, as the EPC contractor on this important project, which helps improve quality of life for people in the region by assuring a supply of low carbon energy to fuel growing demand for electricity. Dominion has selected Matrix for four LNG projects since 2017," said John R. Hewitt, CEO of Matrix Service Company. "This project complements our gas value chain strategy to combine our specialty vessel expertise with our core competency in balance of plant design and construction. We look forward to safely completing this facility with high quality, on-time, and on-budget."

Matrix was awarded the project, which is accounted for in the company's Storage and Terminal Solutions segment backlog, in the first quarter of fiscal 2024. The project is expected to be completed in the first quarter of calendar 2028.

About Matrix Service Company

Matrix Service Company (Nasdaq: MTRX) is a leading specialty engineering and construction company whose commitment to safety, quality, and integrity has earned the Company a leadership position in providing infrastructure solutions across multiple end markets. Our work is foundational to helping our energy and industrial clients achieve their objectives, positively impact quality of life through the products they provide and improve the efficiency and resilience of their critical infrastructure. We pride ourselves on our commitment to our culture and core values, offering an inclusive and respectful work environment, and being certified as a Great Place To Work^®.

The Company is headquartered in Tulsa, Oklahoma with offices located throughout the United States and Canada, as well as Sydney, Australia, and Seoul, South Korea. The Company reports its financial results in three key operating segments: Utility and Power Infrastructure, Process and Industrial Facilities, and Storage and Terminal Solutions.

To learn more about Matrix Service Company, visit https://www.matrixservicecompany.com and read our most recent Sustainability Report.

For more information about Matrix, please contact:

Kellie SmytheMatrix Service CompanySenior Director, Investor Relations, Marketing, Communications, and SustainabilityT: 918-359-8267Email: [email protected]

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