How Dominion Powers 85% of Your Energy Needs

Eighty-five percent. That's the share of electricity Dominion Energy generates and delivers directly to its customers — sourcing the remaining 15% through purchases on the PJM Interconnection, the wholesale market that coordinates power across 13 states and Washington D.C. For anyone developing infrastructure, negotiating land, or planning large energy loads in Dominion's territory, that number is more than a statistic. It's the architecture of how power actually gets to you, and it carries real consequences for reliability, cost, and long-term planning.

Understanding that split — and what it means operationally — is increasingly important as data centers, battery storage facilities, and clean energy projects flood into Dominion's service territory.

Understanding Dominion's Energy Supply

Dominion Energy operates one of the largest regulated utility footprints in the United States, primarily serving Virginia and the Carolinas. Its generation portfolio is deliberately diversified: nuclear, natural gas, offshore wind, solar, and a declining but still-present slice of coal. That mix allows Dominion to generate the vast majority of what its customers consume without relying on spot market purchases.

The 85% self-supply figure isn't just an operational preference — it's a strategic posture that reflects Dominion's commitment to vertical integration in an era when many utilities are retreating from generation ownership.

The remaining 15% comes from PJM's wholesale market, which is where things get more dynamic. PJM operates the grid across a 370,000-square-mile footprint serving roughly 65 million people. When Dominion needs to supplement its own generation — during peak demand events, plant maintenance windows, or unexpected outages — it's bidding into or drawing from a market where dozens of generators compete, and prices can swing dramatically based on weather, fuel costs, and transmission constraints.

That 15% slice might sound small, but at Dominion's scale, it represents thousands of megawatt-hours and billions of dollars in transactions over time. The price at which Dominion clears those purchases directly affects what regulated customers ultimately pay.

The Reliability Equation

Reliability in the utility world is measured in fractions — SAIDI scores, reserve margins, transmission contingencies. Dominion's high self-supply ratio gives it a meaningful reliability advantage: when wholesale markets tighten, as they did during Winter Storm Elliott in December 2022 (when PJM prices briefly spiked to the $2,000/MWh cap), a utility that generates most of its own power is insulated from the worst of it.

For infrastructure developers — data center operators, EV charging networks, industrial manufacturers — Dominion's supply model translates into a more predictable operating environment than you'd find in a heavily market-dependent utility.

But reliability isn't just about where the electrons come from. It's about whether the transmission and distribution infrastructure can physically move power to where it's needed. Dominion's territory has seen unprecedented load growth, driven in large part by Northern Virginia's data center corridor, which now represents the largest concentration of data center capacity on Earth. That growth is straining interconnection queues and transformer procurement timelines in ways that the 85/15 supply split alone can't solve. Generation adequacy and grid adequacy are two different problems.

Cost Implications of How Dominion Sources Power

Here's the counterintuitive reality: being largely self-sufficient in generation doesn't automatically mean lower rates. Dominion's generation assets were built over decades, and their costs — capital recovery, fuel, operations — flow through to customers via the rate-making process regulated by the Virginia State Corporation Commission.

When Dominion purchases power from PJM, it's generally doing so at market prices, which can be lower than its own embedded generation costs during periods of low wholesale prices. Conversely, during scarcity events, those market purchases can be expensive. The blended cost that customers see reflects both dynamics.

What matters for cost analysis is the trajectory. Virginia's energy policy, shaped heavily by the Virginia Clean Economy Act (VCEA), is pushing Dominion toward rapid decarbonization — retiring fossil fuel plants and replacing them with offshore wind, solar, and storage. That transition requires enormous capital investment. Rate increases tied to clean energy buildout are not hypothetical; they're already flowing through to commercial and industrial customers who need to factor energy cost escalation into 10- and 20-year project pro formas.

For stakeholders trying to model energy costs, the relationship between Dominion's supply choices and end-user rates is not linear. It runs through regulatory proceedings, SCC approval processes, and rider mechanisms that can add or subtract meaningfully from base rates.

Dominion and PJM: A Strategic Relationship

Dominion's participation in PJM is deeper than just buying the last 15% of its load. PJM handles transmission planning, capacity market operations, and grid stability across its footprint — functions that Dominion, like all member utilities, depends on regardless of where its electrons originate.

The PJM capacity market deserves particular attention. Generators bid into PJM's Base Residual Auction to demonstrate they'll be available during peak periods. Dominion's own generation resources participate in this market, and the clearing prices from these auctions influence the economics of new generation investment across the region.

Recent PJM capacity auctions have seen significant price volatility. The 2024/2025 delivery year auction cleared at prices dramatically higher than recent years — a signal that the region's reserve margins are tightening as older thermal plants retire faster than new resources come online. For Dominion, this creates both a challenge (higher market exposure costs) and an opportunity (its own generation assets become more valuable in a scarcity environment).

Stakeholders who understand PJM market dynamics — capacity prices, energy prices, ancillary services — have a significant edge when negotiating power purchase agreements, evaluating site locations, or timing major infrastructure investments.

What's Changing — and What It Means for Stakeholders

Dominion's supply strategy won't look the same in 2030 as it does today. Several forces are reshaping it simultaneously.

Offshore wind is the most visible. Dominion's Coastal Virginia Offshore Wind project — targeting 2.6 gigawatts off the Virginia coast — represents one of the largest offshore wind developments in U.S. history. When operational, it will shift Dominion's generation mix significantly toward renewable sources, with capital costs recovered through ratepayer mechanisms. That's new generation capacity but also new rate pressure.

Regulatory scrutiny is intensifying. The SCC has pushed back on aspects of Dominion's cost recovery proposals, and Virginia's political environment around energy policy has grown more contested. The regulatory path for any major utility investment is longer and less predictable than it was five years ago.

Load growth from data centers shows no signs of abating. Dominion has publicly acknowledged the challenge of serving gigawatts of new load while maintaining reliability and managing interconnection timelines. Some developers are already exploring options — on-site generation, behind-the-meter battery storage, direct PPAs structured around Dominion's distribution system — to get projects moving without waiting years in the interconnection queue.

For infrastructure investors and developers operating in Dominion territory, the practical takeaway is this: the 85% self-supply model that has defined Dominion's operational identity is built for a grid that's transforming faster than the planning cycles that designed it. The developers who will succeed are those who treat energy supply strategy not as a utility's problem to solve, but as a core variable in their own project economics — modeling interconnection timelines, rate escalation scenarios, and alternative supply structures from day one.

Dominion isn't going anywhere. But how it powers your project over the next decade will look different than how it has over the last one.

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[INTERNAL LINK: energy supply strategy]

[INTERNAL LINK: PJM market dynamics]

[INTERNAL LINK: Virginia Clean Economy Act]