PJM Interconnection, the grid operator for 67 million people from Chicago to New Jersey, cleared its most recent capacity auction at a record $333.44 per megawatt-day, the third auction in a row to set a high. [1] As the heat dome pushed demand up this week, PJM issued hot-weather alerts across its region. [2] That record price does not appear as a line item on a power bill, but it is embedded in every one, and this week's peak load is the demand it was priced to cover. [3]
The paper argued on June 30 that interconnection queues turn data-center demand into rows. The capacity auction is where those rows become dollars. The trajectory is steep: from $28.92 per megawatt-day for 2024/25, to $269.92 for 2025/26, a 833 percent jump, to $329.17, then to $333.44. [3] Data centers account for 97 percent of the recent load growth driving the climb. [3]
X reads the strain two ways, both apocalyptic: AI data centers will crash the grid, or renewables already have. The auction record tells a more precise story. PJM's latest auction procured 145,777 megawatts, about 6,625 megawatts below its 20 percent reserve-margin target, the cushion meant to prevent more than one outage every decade. [1] That is a reliability shortfall, quantified, not a blackout foretold.
Mainstream coverage, led by Utility Dive, has reported the numbers carefully. What the paper adds is the near-term consequence. The record prices were held down by a temporary cap negotiated with Pennsylvania's governor; without it, the last auction would have cleared near $530 per megawatt-day, about 60 percent higher. [1] The next base residual auction, expected this summer, is set to run without that cap. [1]
The consequence gap is financial before it is physical. A reader who follows the X frame waits for a dramatic blackout that the reserve margin is engineered to prevent, and misses the slower story already on the bill. A reader who follows the auctions sees it plainly: capacity costs rising 1.5 to 5 percent on power bills, a shortfall against the reliability target, and a cap about to come off.
The grid did not fail this week under the heat. It got more expensive, on schedule, in an auction held months ago. The record is in the clearing price and the reserve margin, not in a rumor about the lights going out.
-- DARA OSEI, London