TL;DR · 30-second read
The Short Version
The federal agency that oversees America’s power grids has blocked most of a plan for bringing huge new data centers onto the country’s largest grid, which covers much of the Midwest and Mid-Atlantic.
The plan would have let data centers plug in early if they agreed to be switched off first when power ran short. Regulators said it was unfair to single them out.
Data center demand there is expected to triple by 2030. Without this shortcut, analysts expect electricity supply to stay pricier for longer, which helps power plant owners and could reach household bills.
The Federal Energy Regulatory Commission (FERC), the federal regulator of interstate power markets, has rejected most of a plan from PJM Interconnection for bringing data centers and other large electricity users onto its grid, Seeking Alpha reported, citing Utility Dive. The rejected pieces include PJM’s proposed interim service and its “bring your own new capacity” rules.
At the center of the ruling is PJM’s Interim Resource Adequacy Service framework, which would have allowed large loads to connect without matching new generating capacity, provided they agreed to be curtailed (temporarily cut off) in the run-up to grid emergencies. FERC said key parts intrude on state jurisdiction over retail rates and appear to discriminate against large loads. PJM may submit a revised plan, but must explain, among other things, why data centers would be shut off before other large energy users.
Executive Summary
PJM, the largest US grid operator, is trying to absorb a wave of data center demand it forecasts will triple by 2030 to roughly 29 gigawatts across its Midwest and Mid-Atlantic territory. Its proposed answer was a temporary bargain: let big new users connect before enough new power plants exist, in exchange for being first in line to be curtailed when supply gets tight.
FERC has largely closed that door for now. The ruling does not stop data centers from connecting, but it removes the fastest administrative tool PJM had proposed for adding large loads without first securing matching supply. That pushes the question of who pays for, and who absorbs, any shortfall back onto the existing machinery: PJM’s capacity market and the terms under which new loads are interconnected.
Jefferies analysts read the decision as positive for independent power producers such as Constellation Energy, NRG Energy, Talen Energy and Vistra, because it could keep capacity prices higher for longer. For data center developers and the customers who ultimately fund grid reliability, it means the cost of growth stays priced through the market rather than managed through interruption.
What FERC Actually Objected To
FERC’s objections fall into two buckets. The first is jurisdictional: the commission said key parts of the interim framework intrude on state authority over retail rates. In the US system, FERC governs wholesale markets and interstate transmission, while state utility commissions set the rates retail customers pay. A rule that determines which end-use customers get interrupted, and on what terms, edges into territory states traditionally control.
The second objection is about fairness. FERC said the framework appears to discriminate against large loads, and it specifically asked PJM to justify why data centers would be cut off before other large energy users. That is a pointed question. A steel mill, a chemical plant and a hyperscale data center (a very large facility run by a major cloud provider) all draw large, steady amounts of power. A rule that singles out one category needs a reason grounded in how that load affects the grid, not just in the fact that it is new.
Notably, FERC left the door open. PJM can file a revised curtailment plan if it addresses these issues. So the ruling reads less as a rejection of curtailment as a concept and more as a demand that any version be defensible on jurisdiction and non-discrimination grounds.
Why the Load Falls Back on Capacity Prices
To see why this matters, it helps to know what the interim service was meant to do. PJM runs a capacity market, in which power plants are paid to commit to being available in future periods so the grid has enough supply at its peak. Normally, new demand has to be covered by that committed supply. The Interim Resource Adequacy Service would have let large loads connect without matching new capacity, using their willingness to be curtailed as the safety valve instead. The companion “bring your own new capacity” rules offered another path: loads that supply their own generation. FERC rejected both.
With those paths largely closed, the default mechanism carries the burden. If data center demand climbs toward the roughly 29 gigawatts PJM forecasts by 2030, and new loads cannot connect on an interruptible basis or through a dedicated self-supply track, that demand has to be covered by capacity procured through the market. More demand chasing the same supply pushes prices up, which is the mechanism behind Jefferies’ view that the ruling “could lead to higher capacity prices for longer.”
The parties affected are clear. Owners of existing generation benefit from firmer prices. Data center developers lose a potential fast lane and may face longer or costlier connection terms. And because capacity costs are carried by the utilities and suppliers that serve customers, sustained high capacity prices tend to flow through to bills broadly, not only to the data centers driving the demand. That distributional question, who absorbs the shortfall, is exactly what the curtailment plan had tried to answer by assigning the risk to the new loads themselves.
The Fairness Debate Cuts Both Ways
PJM’s logic was intuitive: data centers are the main source of new demand, so they should bear the reliability risk they create, either by bringing supply or by accepting interruption. That approach would have shielded existing customers from some of the cost of growth.
FERC’s concern is also substantive. Assigning interruption risk by customer type rather than by grid impact sets a precedent that could be applied to other categories later, and it raises the question of why a new factory would be treated differently from a new data center of the same size. A revised plan that defines eligibility by load characteristics such as size, location or flexibility, rather than by industry, would likely be on firmer ground, though whether PJM takes that route is not yet known.
Winners, With Caveats
Jefferies named Constellation Energy, NRG Energy, Talen Energy and Vistra as beneficiaries, all independent power producers that own generation in or selling into PJM. The firm was measured, noting “there is still uncertainty within PJM’s market construct/rules” while calling the development “positive for existing generation/IPPs.”
That caveat matters. A revised PJM filing could restore some form of curtailment-based connection, and state actions or other market rule changes could shift the outlook. The near-term read is that capacity scarcity stays priced in; the longer-term read depends on what PJM files next and how quickly new supply can be built.
Background
PJM Interconnection operates the largest US power grid, spanning much of the Midwest and Mid-Atlantic. Like other regional grid operators, it must ensure enough generation is available to meet peak demand, which it does largely through a capacity market that pays power plants to commit to future availability. FERC, the federal regulator of interstate electricity markets, must approve changes to those market rules.
The surge in data center construction, driven heavily by cloud computing and artificial intelligence, has made PJM a focal point for the tension between fast-growing demand and slower-moving power plant construction. PJM forecasts data center demand in its territory will triple by 2030 to roughly 29 gigawatts, and its proposed interim service was one attempt to let that demand connect while new supply catches up. Source: FERC rejects most of PJM’s temporary curtailment plan to manage data centers — report on FERC’s ruling against PJM’s interim large-load service and bring-your-own-capacity rules.Sources