Virginia moves to require data centers to pay full cost of new transmission lines as AI sites demand 300 MW

Virginia’s new rules require data-center developers to bear the full cost of new transmission lines, preventing those costs from being socialized across ratepayers. The change follows protests in Loudoun County and Data Center Alley, where existing facilities average 54 megawatts and draw power from Dominion Energy. The state’s action converts local opposition into procurement and interconnection requirements. Developers now face higher upfront capital costs and slower approvals.

The source describes two power paths: grid connection or behind-the-meter generation, meaning on-site power rather than utility supply. In Ashburn, Equinix facilities use Dominion grid power with diesel backup. Outside Virginia, AI training sites start at 300 megawatts, too large for many rural grids, pushing developers toward natural-gas turbines. Anthropic is reported to have agreed to $3.4 billion for gas turbines, the largest such purchase by an AI company. The figure is not independently confirmed.

OpenAI's Chris Lehane called data centers a proxy for public unease, but the binding constraint is electrons. A 300-megawatt site is industrial, comparable to a small city's demand. When grids cannot absorb that load, companies become self-generators, locking in fossil fuel capacity for decades. The backlash is therefore a grid-impact conflict: transmission costs, peak curtailment, diesel backup, and utility fuel mix.

Expect more state and utility rules: cost allocation, interconnection queues, curtailment clauses, and pollution permits for behind-the-meter turbines. AI developers will bid for transmission upgrades, co-locate with utilities, or buy generation assets. The decisive metric is not GPU count but megawatts secured, fuel permitted, and grid services paid for. Virginia's rule is a template for other jurisdictions. Investors should track utility filings and interconnection agreements.