Dominion Energy Seeks 4,000MWh+ Long-Duration Storage: Virginia's LDES Pilot Opens
Dominion Energy Virginia (DEV) has issued a formal Request for Information (RFI) seeking long-duration energy storage LDES technologies capable of delivering at least 4,000MWh of capacity for a planned pilot program—a solicitation that directly advances Virginia's legislated mandate requiring the utility to deploy 3,480MW of LDES capacity by 2045. The RFI, announced June 23, requests comprehensive technical, commercial, and supply chain information from LDES technology providers, with industry responses due within six weeks of the June 26 issuance date.
Virginia's LDES Definition: 10+ Hours Changes Everything
Virginia legislation defines long-duration energy storage LDES as technology capable of delivering power at full nameplate capacity for 10 or more continuous hours—a threshold that excludes conventional 2-hour and 4-hour lithium-ion BESS installations and deliberately targets the emerging class of multi-day storage technologies. This 10-hour floor aligns with the operational requirements of a grid facing simultaneous coal plant retirements and surging data center load growth in the PJM Interconnection region, where Northern Virginia's "Data Center Alley" has become the world's largest concentration of hyperscale computing infrastructure. The 4,000MWh minimum capacity target for the pilot program signals that DEV is thinking at utility scale from day one—not running a technology demonstration but preparing for commercial deployment.
The Legislative Backbone: Governor-Ordered 16,000MW Short-Term + 3,480MW LDES
The RFI operates within a specific regulatory framework established by legislation signed by Virginia's Governor in April 2026. The law mandates Dominion Energy to deploy 16,000MW of short-duration energy storage and 3,480MW of long-duration energy storage LDES by 2045—a combined storage portfolio that would rank among the largest utility storage mandates in the United States. The 3,480MW LDES target alone represents more long-duration capacity than most countries have deployed across all storage durations. Previous steps toward this mandate include Dominion's pilot deployment of Form Energy's iron-air battery and Eos Energy's zinc hybrid cathode battery at the Darbytown power station—early technology validation projects that have now given way to a full-scale procurement process.
What the RFI Requests: Seven Technical Dimensions
The RFI requests information across seven specific categories: company background and business model, technical specifications of the storage technology, deployment history and track record, commercial readiness and timeline, scalability potential and capacity limits, siting requirements and infrastructure needs, and supply chain considerations including material sourcing strategies. This level of detail reflects the seriousness of the procurement—DEV is not surveying the technology landscape but qualifying vendors for a competitive solicitation that could lead to firm offtake agreements. Technology providers capable of meeting the 10-hour duration threshold with proven field deployments will have a significant advantage, as the utility has explicitly identified track record as an evaluation dimension. For developers and integrators preparing LDES project proposals, shop now to discover AGAIC POWER's long-duration energy storage solutions engineered for utility procurement requirements.
The Data Center Dimension: Why Virginia Needs LDES Now
The driving force behind Virginia's aggressive LDES mandate is unmistakable: data center load growth in PJM territory is reshaping grid planning assumptions on a scale not seen since the electrification era of the mid-20th century. Northern Virginia alone hosts more than 300 data centers consuming multiple gigawatts of continuous, 24/7 power—a load profile that solar-plus-4-hour-storage cannot fully serve, particularly during multi-day winter low-renewable-output periods. Long-duration energy storage LDES technologies capable of 10-to-100-hour discharge are uniquely positioned to bridge this gap, providing the firm, dispatchable capacity that data center operators require to meet their own 24/7 carbon-free energy commitments. As hyperscale operators including Amazon, Microsoft, and Google escalate their clean energy procurement in the PJM region, utility-scale LDES deployment is transitioning from a regulatory compliance exercise to a fundamental grid reliability necessity.
Competitive Landscape: Form Energy, Eos, and Beyond
Dominion's existing pilot deployments at Darbytown provide a baseline for the competitive landscape. Form Energy's iron-air battery technology, which targets 100-hour duration at a claimed cost below $20/kWh, and Eos Energy's zinc-based batteries, offering 3-to-12-hour duration with a non-flammable aqueous electrolyte, represent two distinct technical approaches to the LDES challenge. However, the 4,000MWh minimum RFI threshold opens the field to a broader set of contenders, including flow battery manufacturers, compressed air energy storage developers, and advanced thermal storage technology providers. The six-week response window—closing in early August 2026—means the competitive field will be defined quickly, and technology providers who have not already engaged with Dominion's procurement team face a compressed timeline. For energy storage investors tracking the US LDES market, explore our collection of advanced storage solutions positioned for the emerging long-duration segment.
What Dominion's RFI Means for the US LDES Market
Dominion Energy's LDES RFI marks a transition point for the entire US long-duration energy storage LDES market. While California, New York, and other leading states have established LDES procurement targets, Virginia's mandate—driven by the tangible, near-term imperatives of data center load growth and coal plant retirements—translates policy ambition into concrete procurement action faster than any other jurisdiction. If the pilot program leads to full commercial deployment at the scale envisioned by the 3,480MW mandate, Virginia could single-handedly create the manufacturing volume necessary to drive LDES technologies down the cost curve, benefiting deployments in every other market. For an industry still searching for the project volume that transforms emerging technologies into bankable asset classes, Dominion's RFI may prove to be the catalyst the LDES sector has been waiting for.
