Largest U.S. Power Grid Faces Third Consecutive Supply Shortfall as AI Demand Pressure Persists
N.R. Finch
PJM, the largest U.S. grid operator, fell 6.8 GW short of its reliability target in a third consecutive capacity auction; the gap — equal to nearly seven conventional nuclear plants — signals that AI-driven power demand is outpacing the system's ability to keep up, with rising costs headed straight to household bills.
How big is a 6.8 GW shortfall?
PJM's auction for the delivery year starting June 2028 came up 6.8 GW short of the reliability requirement — roughly seven conventional nuclear plants worth of capacity.
This is the third consecutive auction miss. In plain terms = the grid buys power every year and keeps coming up short, and the gap is not closing.
What does this cost, and who pays?
The auction paid generators a total of $16.4 billion, matching the record set in the previous round. The daily rate hit the $325-per-megawatt-day price cap.
This means → generators are already earning the maximum the rules allow, yet supply still falls short.
PJM serves 13 states plus Washington, D.C. First-quarter wholesale prices jumped 76% year-on-year, driven primarily by data-center demand.
Put simply = the cost lands on household and business electricity bills across those states.
Why can't the grid keep up?
PJM's footprint includes Virginia's "Data Center Alley" — one of the densest clusters of data centers in the U.S. AI buildouts are pushing baseline demand steadily higher.
An extreme heat-dome event earlier this month pushed the grid close to its limits; peak demand may break a record set more than twenty years ago.
This reflects two pressures stacking: long-term AI load growth + short-term extreme-weather spikes, squeezing the grid from both ends.
Can the "emergency procurement" mechanism fix this?
Later this year PJM will launch an emergency procurement process designed to shift responsibility for adding new generation onto hyperscale cloud operators — in effect, whoever builds the data center must secure matching power supply.
PJM has not yet filed a formal plan; the process is expected to begin in September, after pressure from the White House and several state governors.
In plain terms = instead of the grid finding power for everyone, the biggest electricity consumers — Big Tech — would have to source their own.
Is the price cap protecting consumers or blocking new supply?
PJM CEO David Mills has described the current situation as "unsustainable."
His argument: the price cap holds down costs today but mutes the investment signal for new plants — generators don't see enough profit to justify building.
This means → the cap protects bills in the short run but deepens the supply deficit over time, creating a vicious cycle.
What comes next?
On July 23, the Federal Energy Regulatory Commission (FERC) will hold a dedicated session on grid governance.
Slow data-center interconnection, rising electricity costs, and market-design disputes are expected to dominate the agenda.
This reflects the issue escalating from an industry-level problem to a federal regulatory priority — whether the supply gap can be narrowed before the emergency mechanism takes effect is the key test of the entire framework.
Content is for reference only, not financial advice.