PA Environment Digest Blog: PJM Data Center-Driven Power Auction Prices Limited By $325/MW-Day Cap; Without Cap Would Have Been 70% Higher In PA, Most Areas; Missed Reliability Target By 6,831 MW

Tuesday, July 14, 2026

PJM Data Center-Driven Power Auction Prices Limited By $325/MW-Day Cap; Without Cap Would Have Been 70% Higher In PA, Most Areas; Missed Reliability Target By 6,831 MW

On July 14, the PJM Interconnection said the latest power auction brought in bids limited by the $325/MW-Day price cap to secure 136,318 MW of electric capacity generation-- 6,831 MW less than is needed to meet PJM’s reliability standard.

Reuters reported without the cap, the A.I. data center-driven auction prices would have surged to $554.72 per megawatt-day for most of the regional grid, including Pennsylvania. In the region covered by electric utility ComEd, which includes parts of Illinois, prices would have cleared at more than $775 per megawatt-day.

PJM said while the price cap and floor may reduce volatility, they do not solve the underlying supply-demand imbalance. Addressing that challenge requires bringing more resources onto the system to meet the pace of demand growth.

The cleared supply procured in the auction times the clearing price totals $16.4 billion.

The total value does not equate to the total cost to load because load that is hedged through self-supply or bilateral contracts is not exposed to the clearing prices in the auction.

The supply mix for RPM cleared and FRR committed resources in this auction in UCAP includes: 46% natural gas, 20% nuclear, 18% coal, 5% demand response, 4% hydro, 2% wind, 2% oil and 1% solar.

Natural gas increased 5,639 MW UCAP primarily from an increase in accredited UCAP factors, coal units that converted to natural gas and units that participated in this auction that did not participate in the last auction.

Coal decreased 2,941 MW UCAP primarily from retirements or conversion to natural gas. Solar increased 651 MW UCAP from new or planned resources.

Did Not Meet Reliability Standard

The capacity of the resources procured in the auction is short of PJM’s reliability requirement by 6,831 MW, meaning that the committed supply is less than what would be required to meet the one-event-in-10-year reliability standard.

This shortfall was not unexpected given the conditions PJM has been observing, including a shortfall of approximately 6,500 MW in the previous capacity auction (for the 2027/2028 Delivery Year).

These most recent auctions were the first in PJM history in which the entire RTO fell short of the reliability requirement.

PJM plans to seek FERC approval to hold a special “Backstop Procurement” in September to help address the near-term shortfall in electricity supply.

Such a shortage does not necessarily mean that the PJM system will be unable to serve load reliably in the delivery year; it means that PJM would have to operate with slimmer reserves and a greater level of risk.

PJM continues to hold a reserve margin of 14.7% for the 2028/2029 Delivery Year.

“These auction results show that demand for electricity continues to grow faster than electricity supply,” said David Mills, PJM President and CEO. “At the same time, PJM recognizes how this supply-and-demand imbalance impacts the reliability of the system and costs for consumers. We are working with government and industry leaders on multiple fronts to restore that balance by bringing on new generation as fast as possible and managing the growth of new load on the grid.”

A detailed report of the results will be available on PJM’s capacity market webpage.

Click Here for the PJM announcement.

Reactions

Claire Lang-Ree, Advocate, Climate & Energy at the Natural Resources Defense Council issued this statement--

“This year’s auction confirms an unacceptable trend: data center load growth is outpacing new electricity supply, degrading reliability, and keeping prices at the cap.

“Only 524 MW of new power plants joined PJM for this auction, proving that new supply simply can’t keep up with the pace of data center load growth, and everyone is paying the price.

“This familiar story is no longer abstract: just last week, record-breaking extreme heat caused by climate change severely tested the PJM system and led to higher electricity prices.

“PJM can solve this problem in the near term by removing large loads – like data centers – that have not brought their own new supply from the capacity auction, implementing a strong ‘Connect and Manage’ construct to triage reliability risks, and working with states to make sure data centers pay for power plants and transmission built to serve them without risking public dollars.

“Ultimately, PJM needs all hands on deck–including elected officials, regulators, developers, and data center companies themselves–to quickly interconnect gigawatts of new, low-cost clean energy.

“The 67 million PJM residents literally can’t afford to suffer any more record-breaking auctions or near-blackout events.”

Clean Power PA released the following statement from coalition Chair Katie Blume--

"Today's results are more of the same: high prices driven by surging data center demand, and a grid that's getting less reliable, not more.

“The Shapiro-negotiated price cap is the only thing standing between Pennsylvania families and even steeper increases.

“While it has already saved consumers nearly $13 billion over the last two auctions, a cap doesn't add a single megawatt of new supply or fix what's broken at PJM.

"Pennsylvanians are already paying an extra $220 to $320 a year — $1.2 billion and counting — not because they're using more electricity, but because PJM's broken process can't connect cheaper clean energy fast enough and lets big new users shift their costs onto everyone else.

"The fix is clear: make data centers pay their fair share, clear the backlog of low-cost wind, solar, and storage waiting to connect, and stop propping up expensive false solutions.

“PJM needs to focus on lowering bills for families, and the data center boom can't be the excuse for higher ones."

Brandon Smithwood, Vice President of Policy for Dimension Energy, issued this statement--

“Today's results are further proof that Pennsylvania needs to expand local solar. It is one of the only resources that can be built quickly enough to make a real dent in this crisis.

“Local solar connects to the grid in under two years, doesn't require the costly transmission buildout utility-scale projects need, and can be sited close to the data centers driving prices higher.

“Every distributed solar project that comes online is one less megawatt Pennsylvanians have to buy at these record capacity prices.

"Capacity prices are a direct pass-through to ratepayers, and this shortfall is the clearest signal yet that Pennsylvania needs more generation, especially with data center demand showing no sign of slowing down.

“Ratepayers are already footing the bill for historically high energy costs, and every year without more local solar is another year of higher bills. Pennsylvania lawmakers should seize the opportunity in front of them and clear the way for more local solar now.”

Resource Links:

-- Budget First Look: At Best A Cost To Carry Environmental Budget, Supports Oil & Gas Program Operations, Several Data Center Provisions But Not A Moratorium Or Pause [PaEN]

-- A.I. Data Center Legislative Scorecard: Pennsylvania Failed To Finalize Meaningful Legislation On Energy Affordability, To Increase Electric Generation And Give Communities The Tools They Need To Cope With A.I. Proposals [PaEN]

-- Environmental/Energy Groups: Final State Budget Fails To Address Critical A.I. Data Center Issues And Skyrocketing Energy Bills [PaEN]

-- PA Environmental Council: New State Budget Leaves A.I. Data Centers Unresolved, Big Win For Advanced Transmission Line Tech, Modest Progress On Other Energy Issues [PaEN]

-- More Reactions: Final State Budget Fails To Take On Growing Concerns About Energy Affordability And Keeping The Lights On [PaEN]