The Hook
PJM Interconnection is the grid operator for 65 million people across thirteen states and the District of Columbia — the largest competitive electricity market in the world. Once a year it runs a capacity auction: grid resources bid to be available during future periods of peak demand, and the clearing price sets a cost that gets spread across every ratepayer in the territory. In the most recent auction, that price hit the market's hard ceiling.
The Question
When data centers drive the record demand that sets a record capacity price, who pays for it — the data centers, or everyone else?
The Paper Trail
PJM's capacity auction cleared at $333.44 per megawatt-day, the market's administrative price ceiling and the third consecutive record. Total procurement cost: $16.4 billion. PJM's own independent market monitor attributed $6.5 billion — roughly 40% — directly to data-center load growth in this auction. In the prior auction, data centers were attributed with driving roughly 63% of the price increase, approximately $9.3 billion in total cost.
The capacity cost is socialized across all load-serving entities in proportion to their peak demand obligation. A data center pays for its share of the auction result. So does every residential customer, hospital, school, and small business in the territory. The PJM market monitor's independent reports are public filings that document the attribution.
The additional structural detail: PJM cleared the auction approximately 6,600 MW below its own stated reserve-margin reliability target. The region paid record prices and got a thinner safety margin in return.
The Synthesis
The data center is not at fault for buying power from the grid — that is what the grid is for. The mechanism that spreads the cost to 65 million people who didn't choose to host a data center is a regulatory design. FERC approves that design. PJM administers it. The cost-shift is not a side effect; it is the structure.