PJM Capacity Auction Hits $16.4B Record
- Analysis Data Centers Grid Capacity Grid Connection & Reliability
Marin Holt
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- 7 minutes read
- PJM's December 2025 capacity auction cleared at $16.4 billion, a new record for the region
- Clearing price hit FERC-approved cap of $333.44/MW-day for 2027-2028 delivery year
- Data centers drove 5,250 MW of the 5,100 MW increase in forecast peak load vs. prior year
- PJM fell 6,623 MW short of its 20% installed reserve margin target
- Data center loads accounted for 40% ($6.5B) of total capacity costs per independent market monitor
PJM Interconnection’s December 2025 capacity auction cleared at $16.4 billion, a new record for the grid operator serving 13 states and Washington D.C. Data centers account for 30 of the 32 gigawatts of peak demand growth PJM projects between 2024 and 2030, and that concentration drove 63% of the cost increase in the most recent auction cycle.
What the Auction Reveals
The December 2025 auction covered the 2027-2028 delivery period. It follows two prior records: $16.1 billion in July 2025 and $14.7 billion in 2024. PJM procured 145,777 MW in the December auction but fell 6,625 MW short of its 20% installed reserve margin target. That margin is the buffer PJM maintains to prevent more than one unexpected outage per decade. Starting summer 2026, PJM operates at the edge of its reliability threshold.
The independent market monitor, Monitoring Analytics, identified data center demand as the primary cost driver. Data centers were responsible for approximately $9.3 to $9.4 billion in additional costs to ratepayers in the 2025-2026 cycle.
Why the Grid Cannot Keep Up
Over 100 gigawatts of new generation capacity, mostly solar, wind, and batteries, sits in PJM’s interconnection queue. In the 12 months before the July 2025 auction, only 2.7 GW of new generation was actually added to the grid. New loads connect faster than new supply builds. Data center campuses move from announced to operational in two to four years. Utility-scale generation requires five to ten years from permit to power.
FERC ordered PJM on December 18, 2025 to develop formal rules for colocating large loads at power plants, a mechanism intended to allow hyperscale tenants to bypass the transmission queue by connecting directly to generation. The DOE issued a parallel large-load interconnection proposal in October 2025, with FERC expected to issue a final rule by April 30, 2026.
Consumer Cost Impact
PJM customers face bill increases of 1.5% to 5% starting June 2026. An NRDC analysis projects average families pay $70 per month more by 2028 if the trend continues. Without structural supply additions, PJM consumers could pay an extra $100 billion through 2033.
A price cap that limited capacity costs under a Pennsylvania Governor’s settlement expired after the December auction. The summer 2026 auction is expected to clear higher. The Data Center Coalition, representing Google, Microsoft, Meta, and Amazon, opposed mandatory curtailment requirements during grid stress events and proposed voluntary measures instead. FERC has not yet issued a binding curtailability rule for large loads.
Implementation Realities
Grid operators cannot add capacity on demand. Transmission build requires right-of-way acquisition, environmental review, and multi-year construction. The mismatch between the speed of hyperscale deployment and the pace of transmission infrastructure has no near-term remedy. PJM’s reliability shortfall for the 2027-2028 period is structural, not cyclical.
For data center developers, the capacity auction record translates directly into higher utility rates for grid-connected campuses. Operators who secured long-term power purchase agreements before 2025 are insulated in the near term. New entrants will face capacity cost pass-through in their utility contracts as auctions continue to clear at elevated levels.
Source: Canary Media
Critical Analysis
Data center UPS systems and server power supplies are the dominant non-linear load type in PJM’s 5,250 MW incremental demand forecast. Load growth projections in PJM outstrip generation additions and transmission capacity, forcing emergency planning measures.
5-Year Projection
The 5-year trajectory indicates severe supply chain bottlenecks for Capacity Market, pushing developers toward alternative topologies and domestic manufacturing pipelines.
Critical Perspective
PJM’s December 2025 capacity auction cleared at $16.4 billion, a new record. This price surge dwarfs the $10 billion spent on New York’s congestion relief in 2023. California’s 2019 wildfire crisis led to billions in fines and a decade of grid upgrades. Will simply paying more for capacity truly address the fundamental imbalance between rapid load growth and slow generation build times?
