PJM 2026/2027 Capacity Prices Reach $329/MW-Day as Data Centers

Auction Results and Price Trajectory

PJM Interconnection’s 2026/2027 Base Residual Auction cleared at $329.17 per MW-day across the full RTO footprint, compared with $28.92 per MW-day in the 2024/2025 auction and $269.92 per MW-day in 2025/2026. The BGE and Dominion zones cleared at $466.35 and $444.26 per MW-day, respectively, reflecting tighter supply conditions in the Mid-Atlantic region where data center concentration is highest. The auction procured 134,311 MW of unforced capacity to serve more than 67 million people across 13 states and the District of Columbia.

PJM’s Independent Market Monitor (Monitoring Analytics) attributed the price surge directly to data center load growth, stating that “but for data center growth, both actual and forecast, the PJM Capacity Market would not have seen the tight supply demand conditions” observed. Data centers accounted for $6.5 billion, or 40%, of the $16.4 billion in costs from the December 2025 capacity auction, with approximately $6.2 billion attributable to data centers not yet constructed but projected to enter service by the 2027/2028 delivery year.

First System-Wide Reliability Shortfall

The 2027/2028 Base Residual Auction fell short of PJM’s reliability requirement by 6,623 MW, representing the first time in PJM’s history that the entire RTO footprint, including Fixed Resource Requirement areas, failed to clear sufficient capacity to meet the 20% reserve margin standard. The auction did procure resources representing a 14.8% reserve margin, which does not immediately indicate load shedding risk, but regulators at FERC raised alarms about the structural trend.

PJM’s forecast peak load for the 2027/2028 delivery year was approximately 5,250 MW higher than the forecast used for the prior year’s auction, with nearly 5,100 MW of that increase attributable to data center demand. PJM projects adding 5 to 7 GW of data center load annually while new supply additions run at only 2 to 3 GW per year through 2032. Utilities across the PJM footprint have doubled their forecasts of new large load additions to 12 to 14 GW per year through 2032.

Ratepayer and Grid Reliability Implications

The Market Monitor estimated that data center demand was responsible for 63% of the price increase in the 2025/2026 auction, translating to $9.3 billion in additional capacity costs recovered from customers in higher electric rates. In practical terms, the average residential bill is expected to rise by $18 per month in western Maryland and $16 per month in Ohio as a direct result of data center-driven capacity cost allocation.

Virginia data center electricity demand reached approximately 12.1 GW in 2025, up from 9.3 GW in 2024. New data center connection timelines in Northern Virginia have extended to seven years in some cases due to interconnection queue backlogs and the need for major transmission infrastructure upgrades upstream of substations serving data center clusters.

Grid Architecture Response

PJM and Dominion Energy are deploying enhanced grid automation to manage the sudden load swings associated with data center UPS systems. When transient faults occur, UPS systems cause data centers to instantly switch from grid to battery backup, creating collective demand drops of hundreds of megawatts within milliseconds. A May 2025 incident in Ireland demonstrated the systemic risk: a single remote fault caused 387 MW of data center load to drop simultaneously, representing 52% of all data center demand at that moment, forcing grid operators to activate emergency stability measures.

Texas enacted Senate Bill 6 in June 2025, reforming the ERCOT interconnection process for large loads exceeding 75 MW, requiring proof of site control and financial commitments for transmission infrastructure costs. PJM’s Critical Issue Fast Path stakeholder process is developing requirements for data centers to demonstrate demand response capability or to provide their own generation and storage capacity sufficient to support their load.

National Demand Trajectory

Lawrence Berkeley National Laboratory projects U.S. data center electricity consumption will grow from 176 TWh in 2023 to between 325 and 580 TWh by 2028. AI operations are expected to consume more than 40% of the projected 96 GW global critical data center power load by 2026. Goldman Sachs projects global data center power demand will grow 175% between 2023 and 2030, equivalent to adding a top-10 power-consuming nation to the world’s electricity grid. Hyperscale operators Amazon, Microsoft, Google, and Meta collectively spent over $200 billion on capital expenditures in 2024, a 62% year-over-year increase.

Critical Analysis

Data center UPS systems with 6-pulse rectifier inputs inject 5th and 7th order harmonic currents averaging 28-35% individual THDi at the facility service entrance; aggregated across the 12.1 GW Virginia data center fleet, these currents challenge IEEE 519-2022 Table 1 limit of 1.5% THDv at 69-161 kV buses serving Northern Virginia. The 2027-2028 auction shortfall of 6623 MW is the first system-wide failure to clear PJM 20% reserve margin in RTO history; data center load growth of 5-7 GW annually against new supply additions of only 2-3 GW per year through 2032 creates a structural reliability gap.

Critical Perspective

PJM’s $329.17/MW-day clearing price — an 11.4x increase from 2024/2025’s $28.92/MW-day — is the strongest scarcity signal the capacity market has sent in its history, yet PJM’s interconnection queue holds 1,200 GW of generation waiting an average of five years to connect. The BGE and Dominion zones clearing at $444-466/MW-day reflects transmission-constrained supply, not aggregate scarcity; demand response and VPPs cannot resolve that without targeted transmission investment that PJM’s current infrastructure plan does not fund at the required scale. MISO’s 2022 capacity price reset to 7x prior levels triggered a rush of new commitments that required four years to convert to operating capacity, after which prices moderated significantly. The question is whether $329/MW-day clears sufficient new supply by 2028, or whether AI load growth absorbs every new committed megawatt and the 2027/2028 auction clears higher still.

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