Virginia makes data centers pay for dedicated grid upgrades

On August 5, the Virginia State Corporation Commission directed Dominion Energy Virginia to develop a tariff assigning the full cost of transmission infrastructure used exclusively by a data center or another large-load customer to that customer. The decision sets a new cost-allocation rule, but the implementing tariff has not yet been completed.

The order therefore does not create an immediate household bill credit. Virginia Mercury’s account of the August 5 decision says the commission instructed Dominion to develop the tariff needed to put the new assignment into practice.

Which transmission costs move to the large customer

The ruling concerns dedicated transmission infrastructure: facilities required for, and used exclusively by, a particular data center or other large-load customer. Instead of recovering those project-specific costs from Dominion’s broader customer base, the tariff must assign the full amount to the customer whose project requires the infrastructure.

The exclusivity limit is important. The decision does not make data centers responsible for every transmission project associated with Virginia’s rising electricity demand, nor does it transfer all regional PJM grid costs to the industry. Shared facilities that serve several customers or provide wider system benefits are a different cost category.

Tom’s Hardware’s August 6 description of the ruling likewise identifies the covered facilities as transmission infrastructure used exclusively by the project. That is narrower than requiring a data center to pay the entire cost of a line or substation that also serves other users.

The order does not replace the 2027 GS-5 tariff

The dedicated-infrastructure assignment and GS-5 address different risks. The August decision determines who bears the cost of an identifiable transmission asset needed exclusively for one large customer. GS-5 sets the continuing service obligations for a defined class of very large electricity users, including what they must pay when actual demand is below the capacity they contracted for.

The SCC’s official GS-5 announcement says the class covers customers demanding at least 25 megawatts and takes effect January 1, 2027. Certain customers in the class must pay at least 85% of contracted transmission and distribution demand and 60% of contracted generation demand.

Those minimums reduce the risk that other customers will be left paying for capacity reserved by a large project that opens late, operates below its expected load or never reaches its contracted demand. They do not perform the same function as directly assigning 100% of a dedicated transmission facility’s cost to the customer that exclusively requires it.

The August order does not alter the GS-5 threshold, its January 2027 start date or its minimum-demand percentages. A qualifying customer may ultimately face both sets of obligations: minimum payments under GS-5 and direct responsibility for transmission infrastructure dedicated solely to its project.

What the decision means for residential bills

The ruling is designed to prevent a specific form of cost shifting. Once the new tariff is approved and operating, residential and small-business customers should not be charged for transmission infrastructure shown to serve one large-load project exclusively.

That protection is not the same as a guaranteed reduction in electricity bills. Residential rates also reflect generation, fuel, distribution, shared transmission facilities and regional market charges. Those components can rise even if the dedicated-project rule works as intended.

Claims that the decision will save families and businesses hundreds of millions of dollars should therefore be treated as projections rather than promised bill savings. The measurable effect will depend on how many future facilities qualify as exclusive, their costs, the timing of the projects and the final rules Dominion proposes.

Dominion still has to turn the principle into a tariff

The unresolved questions are operational. Dominion’s filing will need to establish how it identifies infrastructure used exclusively by one customer, how responsibility changes if several large loads share a facility, and how project changes affect the assigned costs.

The SCC must review the resulting tariff before it becomes an operative billing mechanism. Until that process is complete, the August 5 action is a binding direction on cost allocation rather than a finished charge appearing on customer bills.

The current position is therefore precise: Virginia has decided that the cost of transmission infrastructure dedicated exclusively to a data center or another large-load customer should follow that customer. The tariff language and customer-level calculations remain pending, while the separate GS-5 framework is already scheduled to begin in 2027.

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