A PJM power shortfall of roughly 6,800 megawatts is forcing America’s largest electricity grid operator to confront a problem that could become increasingly familiar across the country: electricity demand is rising faster than new dependable generation can come online. Much of that growth comes from data centers, particularly the enormous facilities being built to support artificial intelligence and cloud computing.
PJM Interconnection serves around 65 million people across all or parts of 13 states and Washington, D.C. The region includes major data-center markets in Virginia, Pennsylvania, Ohio and elsewhere, making it one of the first places where the rapid expansion of computing infrastructure is colliding with the practical limits of the power system.
The issue does not mean PJM is about to run out of electricity. It does mean the margin between supply and projected demand is becoming tighter, while regulators, utilities and large power users argue over who should pay for the generation and infrastructure needed to close the gap.
PJM Faces a Growing Power Supply Gap
PJM’s most recent capacity planning has revealed a substantial mismatch between expected electricity demand and the amount of dependable generation available to meet it.
Its 2027-2028 capacity auction secured roughly 134,500 megawatts of dependable capacity, but that left the system about 6,500 to 6,800 megawatts below its targeted reserve requirement.
PJM does not plan a grid around meeting only average demand. It needs additional capacity available for periods when electricity consumption spikes, power plants unexpectedly fail or extreme weather puts unusual strain on the system.
That reserve margin provides the buffer that keeps an ordinary heat wave, winter storm or plant outage from becoming a wider reliability problem.
PJM has identified rapid load growth as the main reason that buffer is becoming harder to maintain. Data centers account for a large share of that increase.
Data Centers Are Changing Electricity Demand
Large data centers consume electricity on a scale that is difficult to compare with traditional commercial buildings.
A single major facility can require hundreds of megawatts, while clusters of interconnected data centers can consume as much electricity as a sizable city. Unlike many industrial loads, they often operate around the clock.
AI has accelerated that trend.
Training and operating large AI models requires thousands of high-performance processors housed in specialized facilities. Those processors consume electricity directly and also generate large amounts of heat, which requires additional cooling equipment.
Developers are announcing increasingly large campuses across the United States, with several projects requiring gigawatts rather than megawatts of electricity.
PJM must therefore plan not just for gradual population growth or ordinary economic expansion, but for individual customers whose electricity requirements can dramatically change demand within one part of the grid.
That is difficult because a data center can sometimes move from proposal to construction much faster than a utility can build a new power plant or major transmission line.
Building New Power Supply Takes Time
The problem is not simply a lack of interest in building more electricity generation.
Large power projects take years.
Developers must obtain land, permits, grid connections, equipment and financing before construction can begin. Transmission projects can take even longer because they frequently cross multiple jurisdictions and require extensive planning.
New generators must also wait to connect to the grid.
PJM, like several other U.S. grid operators, has struggled with a large queue of proposed power projects waiting for interconnection studies. Many of those projects will never get built, but identifying which ones are viable takes time.
Meanwhile, older power plants continue to retire.
That produces an uncomfortable timing problem: electricity demand from data centers can arrive before replacement generation is ready.
PJM has warned that demand growth is now moving faster than the system can add dependable capacity.
Regulators Are Debating an Emergency Backstop
PJM proposed a reliability backstop that would allow it to procure additional generation if normal electricity markets fail to bring enough capacity online.
The Federal Energy Regulatory Commission has accepted parts of that approach but has delayed the proposed procurement mechanism for further review.
The central dispute is not whether PJM needs additional electricity. It is who should pay for it.
FERC has emphasized that existing households and businesses should not automatically bear costs created primarily by large new electricity users.
That is particularly relevant to data centers.
If a new facility requires utilities to build power plants, transmission lines or other infrastructure, regulators increasingly want to determine how much of that cost should fall on the company creating the additional demand rather than being spread across everyone’s electricity bills.
That debate could shape electricity policy far beyond the PJM region.
Could Data Centers Be Cut Off During a Shortage?
PJM has also considered a more direct approach.
Under proposals submitted to federal regulators, some very large new electricity users could face curtailment during periods when the grid cannot meet demand.
Data centers larger than 50 megawatts that connect after certain deadlines could potentially find themselves among the first loads reduced during an emergency unless they secure additional power generation to support their demand.
That represents a significant change from the traditional model.
Large electricity customers have generally expected the grid to provide whatever power they require once they connect. PJM is increasingly considering whether some future facilities should instead bring their own dependable supply or accept that their electricity could be restricted when the system becomes strained.
The concept could encourage technology companies to finance new generation directly.
Several data-center operators are already exploring dedicated natural-gas plants, nuclear power contracts, battery storage and other arrangements that reduce their dependence on the wider grid.
The Federal Government Is Putting Billions Into Nuclear Power
The scale of the problem becomes clearer when looking at the investments now being considered to increase electricity output.
The federal government plans to provide around $4.2 billion in financing to power producer Vistra to increase output from several existing nuclear plants.
Vistra operates six reactors across four nuclear stations capable of producing more than 6.5 gigawatts of electricity.
Rather than building entirely new reactors, the company can increase output from existing plants through upgrades known as uprates. These can include improvements to equipment or the use of more highly enriched fuel that allows reactors to produce additional electricity.
Increasing output from an existing nuclear station can add dependable generation far faster than constructing a completely new plant.
The timing is significant. Federal officials have cited rapidly rising electricity demand from data centers, artificial intelligence, electric vehicles and other large consumers as part of the reason the country needs more generation.
PJM’s power shortfall is therefore part of a much larger national trend.
Household Electricity Costs Are Becoming Part of the Debate
Grid reliability is only one concern.
Electricity bills matter too.
Data centers do not simply consume electricity. Their arrival can require utilities to build substations, transmission lines and new generating capacity.
Someone has to pay for those projects.
Traditionally, utilities recover infrastructure costs through electricity rates spread among customers. That model becomes more controversial when a large portion of new investment serves a relatively small number of enormous industrial users.
Regulators are increasingly questioning whether households should subsidize infrastructure primarily required by data centers.
That concern has reached Congress as well, where lawmakers have debated legislation aimed at preventing ordinary ratepayers from carrying the full cost of grid expansions associated with large new electricity users.
The details remain contested, but the underlying issue is unlikely to disappear. Data-center electricity demand continues to grow, and utilities will need enormous amounts of new investment to serve it.
Reliability Problems Do Not Necessarily Mean Blackouts
A projected PJM power shortfall should not be interpreted as a prediction that widespread blackouts are imminent.
Grid operators plan years ahead specifically so they can identify problems before they become emergencies.
PJM still has multiple tools available.
It can procure additional generation, accelerate transmission projects, encourage customers to reduce electricity use during periods of extreme demand and introduce rules requiring large users to provide their own capacity.
Utilities can also extend the lives of existing power plants or increase output from current facilities.
The concern is that all of those solutions require time, money or changes to how the electricity market operates.
Extreme weather could make the challenge harder.
Very hot summer days can drive air-conditioning demand sharply higher, while severe winter weather can simultaneously increase electricity consumption and disrupt power generation.
A grid operating with a smaller reserve margin has less room to absorb those shocks.
Our guide to choosing backup power for a power outage explains why household-level backup becomes more useful as electricity systems face greater demand and weather-related pressure.
Data Centers Are Not the Only Source of Demand Growth
AI often dominates discussion of rising electricity consumption, but it is not the only factor.
Manufacturing is returning to parts of the United States, particularly industries such as semiconductor production and battery manufacturing that can consume substantial amounts of electricity.
Electric vehicles also shift some energy demand from gasoline toward the power grid.
Electrification of heating and industrial processes adds another source of growth.
For decades, U.S. electricity demand grew relatively slowly. Utilities and regulators became accustomed to planning around that environment.
That period appears to be ending.
PJM now has to prepare for rapid demand growth while simultaneously replacing aging infrastructure and retiring older generating plants.
Why This Matters Beyond the PJM Region
PJM may simply be experiencing the problem earlier than other regions.
Data-center development is expanding quickly in Texas, the Southeast, the Midwest and other parts of the country.
Areas offering inexpensive land and electricity can suddenly attract enormous projects. That can transform local electricity forecasts within a few years.
Grid operators elsewhere will face many of the same questions PJM now faces.
How much generation should utilities build before demand actually arrives? Who pays if a proposed data center never gets built? Who pays if it does? Should large new users guarantee their own power supply? Should they accept curtailment during emergencies?
Those questions involve billions of dollars and potentially millions of electricity customers.
The answers could reshape how the American power system develops over the next decade.
What Preppers Should Take From This
The PJM situation is not a reason to expect an immediate grid emergency.
It is another sign that electricity reliability is becoming a more complicated problem.
The grid increasingly has to deal with extreme weather, aging infrastructure, retiring power plants and a new generation of very large electricity consumers at the same time.
Households cannot control how quickly utilities build generation or where data centers locate, but they can reduce their dependence on uninterrupted grid power.
A realistic grid down survival plan should cover lighting, communications, refrigeration, heating or cooling where necessary, and safe backup power for the equipment a household genuinely needs.
Short outages remain far more likely than prolonged grid failure, so practical preparations for several hours or several days without electricity usually provide the greatest value.
What Happens Next
PJM must now revise parts of its reliability backstop proposal while regulators continue considering how new capacity should be paid for.
Updated demand forecasts will also matter. PJM is changing the way it evaluates proposed large loads so that speculative data-center projects do not distort its planning.
At the same time, utilities and technology companies will continue looking for new sources of electricity.
Nuclear uprates, natural-gas generation, renewable energy, batteries and new transmission will all form part of the response.
The central question is whether those resources can arrive quickly enough.
Bottom Line
The PJM power shortfall does not mean America’s largest grid is about to fail. It shows that the assumptions underpinning the power system are changing faster than infrastructure can easily follow.
Data centers are bringing enormous new loads onto a grid built during decades of relatively slow demand growth. PJM now needs thousands of megawatts of additional dependable capacity while regulators decide who should pay for it.
For households, the most important issue may ultimately be less dramatic than a blackout but much more persistent: a power system that becomes increasingly expensive to expand while operating with less room for error.
The next few years will show whether new generation can catch up with the demand already heading toward the grid.
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