Virginia SCC Orders Dominion to Build Tariff Assigning Transmission Costs Directly to Data Centers — First-Mover Ruling in the Largest Data Center Market Sets National Cost-Allocation Precedent
In its final order in Dominion Energy's Rider T-1 transmission rate case (issued 31 July, reported 5–6 August), the Virginia State Corporation Commission concluded that new large-load data centers are the driver of the roughly $1.5 billion in transmission costs at issue and directed Dominion to file, within 90 days, a cost-assignment policy that bills transmission lines and substation upgrades built solely to serve data centers directly to those customers rather than spreading them across all ratepayers — building on the new GS-5 high-load rate class and backed by Governor Spanberger's administration, which intervened in the case. The Piedmont Environmental Council and ratepayer advocates hailed the order as a first step, while the commission itself acknowledged the tariff may not capture every reliability upgrade triggered by large-load additions, leaving scope disputes for the 90-day filing. MERIDIA assesses a high probability that other state commissions — several already weighing large-load tariffs — cite this order as precedent within two quarters, given Virginia's status as the world's largest data center market, and a moderate probability that the tariff's final scope expands beyond sole-use facilities to shared network upgrades during the filing proceeding. Operational implication: operators and developers in Dominion territory should model materially higher interconnection and transmission charges in Virginia pro formas now, participate in the 90-day tariff docket to shape sole-use versus network cost boundaries, and expect economic-development recruiters in rival states to weaponize the cost differential — while recognizing that direct assignment may defuse the ratepayer-backlash politics currently fueling moratorium campaigns.