PJM Capacity Auction Falls 6,500 MW Short of Reserve Target
- Analysis Data Centers Grid Capacity Grid Connection & Reliability
Marin Holt
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- 6 minutes read
- PJM capacity auction cleared at record $333.44/MW-day, procuring 145,777 MW
- Reserve margin shortfall of 6,520 MW below the 20% installed reserve target
- Wholesale power costs reached $67 billion in 2025, up 54% year-over-year
- Peak demand projected to grow 3.6% annually to 222 GW by 2036
- Consumers face estimated $100 billion in additional costs through 2033
PJM Interconnection’s latest capacity auction cleared at a record $333.44/MW-day, procuring 145,777 MW — roughly 6,520 MW below the grid operator’s 20% installed reserve margin target. The shortfall marks the third consecutive record-setting auction price and signals growing strain on the mid-Atlantic grid, where data center interconnections are outpacing new generation buildout. Wholesale power costs in the PJM region reached $67 billion in 2025, a 54% increase from $43.5 billion the prior year.
Technical Details
PJM projects peak demand will grow by 3.6% annually to approximately 222 GW by 2036, an increase of 65.7 GW over the next decade. Of the 166 GW in forecast peak load growth across the system, roughly 90 GW is linked to data center demand. Capacity costs surged 262% year-over-year, far outpacing the 51% rise in energy costs. The reserve margin gap widened from approximately 210 MW in the 2026/2027 delivery year to 6,520 MW in the 2027/2028 auction, according to Monitoring Analytics.
PJM has trimmed its near-term load forecast through 2032 after applying stricter data center vetting criteria, reducing the 2028 summer peak forecast by 4.4 GW (2.6%). However, the grid operator still expects demand to surge past prior projections through the following decade. Power constraints are extending data center construction timelines by 24 to 72 months, while lead times for high-voltage transformers stretch to 2-4 years.
Critical Analysis
The 90 GW of new data center load entering PJM is dominated by switch-mode server power supplies and double-conversion UPS systems — classic nonlinear loads generating 3rd, 5th, and 7th harmonic current orders, with triplen (3rd, 9th, 15th) harmonics accumulating in distribution neutrals. PJM’s 6,520 MW capacity shortfall — 49 GW projected by 2028 — represents the most severe generation adequacy gap in PJM’s 100-year history, driven by AI data center load growth at 90 GW and accelerated fossil plant retirements.
5-Year Projection
The 5-year trajectory indicates severe supply chain bottlenecks for Grid-Scale Generation, pushing developers toward alternative topologies and domestic manufacturing pipelines.
Critical Perspective
The PJM Interconnection’s capacity auction, clearing at a record $333.44/MW-day and procuring 145,777 MW, fell short of the grid operator’s 20% installed reserve margin target by 6,520 MW. This is reminiscent of the California energy crisis in 2000, where skyrocketing prices and supply shortages led to rolling blackouts and financial turmoil. Comparing this to the Texas grid’s performance during the 2011 heatwave, which also struggled to meet peak demand, we see a pattern of grid operators grappling with the challenges of balancing supply and demand. Will the current trajectory of data center load growth and generation adequacy gaps lead to a similar crisis in the mid-Atlantic region?
Why It Matters
FERC Commissioner David Rosner called the failure to acquire sufficient capacity “unacceptable.” Without intervention, PJM consumers face an estimated $100 billion in additional costs through 2033, with average household electricity bills rising approximately $70 per month by 2028. PJM is now encouraging data centers to bring their own generation or accept demand curtailment during emergencies, a significant policy shift that could reshape how hyperscale facilities approach grid interconnection across the 13-state region.
