In accordance with Virginia Code § 10.1-1402.03(G)(1), this Biennial Progress Report documents Dominion Energy Virginia’s (Dominion Energy) progress to date closing the Coal Combustion Residuals (CCR) units subject to the 2019 legislation (SB 1355). This report documents the closure plan, closure progress to date, accounting of CCR disposal and beneficial use amounts, description of transportation planning, and a discussion of groundwater and surface water monitoring results, for each applicable CCR unit at Dominion Energy’s Chesterfield Power Station, Bremo Power Station, Possum Point Power Station, and Chesapeake Energy Center. The CCR unit closure progress to date is summarized below with details provided for each station in the following sections of this report.

Chesterfield Power Station

• The closure plan includes excavation and removal of CCR from the Upper Ash Pond (11.3 million cubic yards (Mcy)) and the Lower Ash Pond (3.6 Mcy), disposal of approximately 8.1 Mcy in the existing on-site CCR landfill and transporting an estimated 6.8 Mcy off-site by rail for beneficial use.

• Design, permitting and procurement phases are substantially completed. A solid waste permit (SWP 619) for the pond closures and associated groundwater and surface water monitoring is in process with Virginia DEQ (“DEQ").

• Significant infrastructure construction has been completed, including the ongoing sequential build-out of the existing on-site CCR landfill, construction and operation of a water treatment system, rail loading facility and associated track upgrades, road upgrades, truck wash system, water line extension, and additional infrastructure improvements to support the project.

• The CCR beneficiation contract was rebid in late 2022, and a new contract was awarded in early 2024 to transport CCR off-site by rail for beneficial use.

• Upper Ash Pond – As of June 30, 2024, approximately 123,812 cy of CCR has been excavated and transported to the on-site rail loading facility for off-site beneficial use, and 887,917 cy of CCR has been excavated and transported to the on-site CCR landfill for disposal.

• Lower Ash Pond – As of June 30, 2024, approximately 757,781 cy of CCR has been excavated and transported to the on-site CCR landfill for disposal.

Bremo Power Station

• The closure plan includes excavation and removal of approximately 6.2 Mcy of CCR from the North Ash Pond for placement in a new on-site CCR landfill to be constructed adjacent to the North Ash Pond.

• Received Special Use Permit from Fluvanna County for new landfill.

• Final design and permitting phases are in process. The project has received a VPDES permit renewal, Clean Water Act Section 404/401 permits for impacts to wetlands and surface waters, and a conditional Part A Solid Waste Permit (SWP 627) for the new CCR landfill. The Part B SWP for construction of the new CCR landfill is under review by DEQ with an expected approval by early 2025.

• Construction of a water treatment system has been completed, and commissioning of the system is underway.

Possum Point Power Station

• The closure plan includes excavation and removal of approximately 4 Mcy of CCR from Pond D for placement in a new on-site CCR landfill to be constructed adjacent to Pond D.

• Received zoning determination from Prince William County for new landfill.

• Design and permitting phases are in process. The project has received a State Programmatic General Permit (SPGP) from DEQ for wetland and surface water impacts and a conditional Part A Solid Waste Permit (SWP 628) for the new CCR landfill. A VPDES permit renewal application was submitted in 2024 and is under review by DEQ, and the Part B SWP application is being finalized for submittal to DEQ in late 2024.

• Construction of a water treatment system is underway with expected completion and commissioning in 2025.

Chesapeake Energy Center

• The closure plan includes excavation and removal of approximately 2.2 Mcy of CCR from the site, including the landfill, bottom ash pond, and historical pond, for off-site transportation by rail (or barge) and truck for disposal and/or beneficial use.

• A Conditional Use Permit (CUP) for closure of the landfill, bottom ash pond, and historical pond was issued by the City of Chesapeake in December 2022.

• Design and permitting activities are underway with applications for a SWP modification (closure) and VPDES permit renewal expected to be submitted to DEQ in 2024.