Large data centers connected to the biggest electricity grid in the United States could face temporary power cuts when demand threatens the stability of the system.
PJM Interconnection, which manages electricity transmission across a large region stretching from Virginia to Illinois, plans to reduce power supplies to some of its largest customers during periods of severe grid stress. The policy is intended to prevent wider blackouts as electricity consumption from data centers continues to grow.
The restrictions are expected to begin in June 2027 and will apply to data centers and other facilities using at least 50 megawatts of electricity.
The rapid expansion of artificial intelligence, cloud computing, streaming platforms, and other digital services has created enormous demand for new data centers.
These facilities require continuous electricity to operate servers, networking equipment, storage systems, and cooling infrastructure. A single large data center can consume as much electricity as a small city, while clusters of facilities can place significant pressure on regional power networks.
Electricity use by data centers is expected to increase sharply over the next decade. By 2035, their total power consumption could be four times higher than it is today.
This growth is forcing grid operators to reconsider how quickly new facilities can be connected and whether enough generating capacity will be available to support them.
PJM Interconnection serves approximately 67 million people across 13 states and the District of Columbia. Its territory includes Northern Virginia, one of the world’s largest data center markets.
Under the planned policy, qualifying data centers could temporarily lose access to grid electricity when available supply is not sufficient to meet demand.
The cuts would not be routine shutdowns. They would be used during periods when the grid is under serious pressure and reducing consumption could help prevent a larger outage affecting homes, hospitals, businesses, and public services.
The policy resembles existing demand response programs that have been used for decades. These programs allow grid operators to ask large customers, including factories and industrial sites, to reduce electricity use during critical periods.
Participating customers are generally compensated for making their power consumption available for reduction.
The amount of warning provided before a power reduction could depend on the type of emergency and how accurately grid operators can predict electricity demand.
Some demand response events are announced several days in advance. Others may provide customers with only 30 minutes of notice.
Data centers are designed to operate continuously, so even a temporary interruption can create significant challenges. Operators may need to move computing workloads to facilities in other regions, rely on batteries, or activate backup generators.
Companies that manage services for banks, hospitals, government agencies, online retailers, and communication platforms will need to ensure that their systems remain available when grid power is reduced.
The threat of temporary power cuts could encourage more data center operators to develop on-site electricity generation.
Some companies are already exploring natural gas plants, renewable energy systems, battery storage, fuel cells, and small modular nuclear reactors as alternatives to relying entirely on the public grid.
Producing electricity on-site could give operators more control over their power supply and reduce the risk of service interruptions. It could also allow new facilities to open in areas where the electricity network cannot provide enough additional capacity.
However, private generation projects can be expensive, complicated, and slow to develop. They may require environmental approvals, fuel contracts, new transmission equipment, and agreements with local authorities.
Data centers that do not build permanent sources of on-site power may depend more heavily on backup generators during grid emergencies.
Diesel generators are widely used because the fuel is readily available and can be stored at the facility. They can also start quickly when grid electricity becomes unavailable.
Federal regulations allow certain generators to operate for a limited number of hours each year during demand response events, emergencies, testing, and maintenance.
Greater use of diesel generators could help data centers continue operating, but it may also create environmental and public health concerns.
Diesel equipment can produce air pollutants that affect nearby communities. These concerns may become more serious in regions where many data centers are concentrated close to residential areas.
PJM has faced criticism over its management of new electricity generation and the rapid addition of large energy users.
Wholesale electricity prices in its territory have nearly doubled over the past year. PJM’s independent market monitor has identified data center demand as a major contributor to the increase.
Higher wholesale prices can eventually affect households and businesses through increased utility bills, although the exact impact depends on local regulations, contracts, and electricity providers.
The situation has created debate over who should pay for the infrastructure required to support data centers.
Consumer advocates and policymakers have questioned whether households should help cover the cost of new power plants and transmission lines built primarily to serve large technology companies.
Data center operators may face increasing pressure to fund grid upgrades, secure their own generation, or agree to temporary power reductions.
The planned curtailment policy follows an auction intended to secure additional electricity generation for the PJM region.
The auction did not attract enough new capacity to fully address anticipated demand. PJM is now conducting another auction in an effort to obtain additional generation.
Building new power plants and transmission infrastructure can take several years. Data centers, however, can often be planned and constructed more quickly.
This difference in development timelines has created a growing mismatch. Electricity demand is increasing faster than utilities and grid operators can expand supply.
Temporary power cuts provide PJM with a way to manage that gap while longer-term energy projects are developed.
Artificial intelligence has become one of the biggest drivers of new data center construction.
Training and operating large AI models requires significant computing power. Technology companies are installing increasingly advanced processors, which consume large amounts of electricity and produce heat that must be removed through cooling systems.
As AI services become more widely used, the energy requirements associated with these systems are expected to continue rising.
Grid operators, regulators, utilities, and technology companies will need to coordinate more closely to prevent electricity shortages. That could include building new generation, expanding transmission networks, improving energy efficiency, and locating data centers in regions with greater power availability.
PJM’s policy may influence how other grid operators respond to rapid data center growth.
Regions with large clusters of technology infrastructure could adopt similar rules if electricity supply fails to keep pace with demand. Large facilities may increasingly be required to accept flexible power arrangements as a condition of connecting to the grid.
For data center companies, reliable access to electricity is becoming as important as access to land, water, high-speed networks, and skilled workers.
The possibility of temporary power cuts signals that unlimited grid access can no longer be assumed. Companies planning new facilities may need to demonstrate that they can reduce demand, generate their own electricity, or continue operating without placing the wider power system at risk.
As digital services and AI become more central to the economy, balancing data center growth with grid reliability will become one of the most important infrastructure challenges facing the United States.
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