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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteA data center can add a large, concentrated electricity demand to one point on the grid, often with a need for power around the clock. Whether that requires new lines, substations, transformers, generation, or other measures depends on the project’s location and the capacity already available there. A data center does not automatically cause outages or raise household bills: those outcomes depend on local grid conditions, project arrangements, and applicable utility and regulatory rules.
Why a data center’s location matters to the grid
Electricity has to reach a facility through a connected network, not just exist somewhere in the country. Power moves from generators across the bulk transmission system, through substations and local distribution equipment, and ultimately to a customer’s connection. A data center’s load is concentrated at that connection. If the network serving it lacks capacity, adding generation elsewhere alone may not resolve the bottleneck.
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Data centers are significant grid customers because their demand can be large, may grow quickly, and often needs to be served continuously. The effect of a proposed facility therefore depends on its size, how quickly its demand ramps up, the connection point, the existing network’s available headroom, and how the utility or transmission provider plans to serve it. Two facilities with similar electricity use can have different local effects if one connects where capacity is readily available and the other does not.
Siting can be geographically constrained by latency requirements, according to the U.S. Department of Energy (DOE). That means a project may not be free to move to whichever location has the easiest grid connection. The location can shape both the infrastructure needed and the schedule for bringing service online.
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National electricity-use estimates help describe the scale of data-center demand, but they do not predict conditions on a particular street, feeder, or substation. Local studies are needed to establish whether equipment serving a proposed site has enough capacity and what changes may be required.
What the national electricity figures do—and do not—show
Lawrence Berkeley National Laboratory (LBNL), in a 2024 report, estimated that data centers used about 4.4% of total U.S. electricity in 2023. The report projected that their share could reach approximately 6.7% to 12% by 2028. The 2028 figures are a forecast range, not measured consumption, and neither figure identifies the impact of a particular project on a local grid. DOE’s Electricity Demand Growth Resource Hub attributes these estimates to LBNL’s report.
FERC’s 2024 State of the Markets report, released in March 2025, reported a 2.8% increase in electricity demand across organized U.S. regional markets in 2024. That is a regional-market aggregate, not a measure of data-center demand alone. The same report said more than 5,000 circuit miles of transmission projects entered service in 2024; that national total does not show how much capacity is available to a particular proposed facility.
These numbers answer different questions: LBNL’s estimates describe data centers’ share of national electricity use, while FERC’s market figure describes demand across regional markets and its circuit-mile figure describes transmission construction. None substitutes for a utility’s local interconnection and planning studies.
Which grid upgrades might be needed?
There is no standard upgrade package for every data center. A utility or transmission provider studies the proposed load and identifies the constraints between the facility and the power supply. The necessary work may be on the local distribution network, the bulk transmission system, the supply side, or more than one of these.
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Transmission lines and related equipment
Transmission carries electricity over longer distances and connects loads with generation. If a study finds that existing lines or associated equipment cannot reliably move enough power to serve a new large load, projects may include new lines or upgrades to existing ones. These investments can also relieve broader network constraints, but they take planning and deployment work. In its September 30, 2024 Transmission Impact Assessment, DOE said, “Ultimately, a robust transmission system is required to meet grid needs and support increased activity and load growth associated with data centers, new manufacturing facilities, and electrification.” The assessment also noted that piecemeal deployment processes have struggled to keep pace with needs, contributing to delays and higher costs.
Substations, feeders, and transformers
Distribution equipment serves customers closer to the point of use. A substation, feeder, or transformer may need added capacity or replacement if it cannot serve the proposed demand. A transformer’s role is not unique to data centers: DOE’s Office of Electricity describes distribution transformers as serving many kinds of loads, including data centers. Its November 27, 2024 announcement about a report prepared by the National Renewable Energy Laboratory examined transformer numbers, capacity, age profiles, and potential demand.
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Generation, storage, flexibility, and efficiency
Grid planners can consider supply and demand measures alongside wires and substations. DOE identifies clean-energy deployment, storage, demand-side flexibility, data-center efficiency, and grid infrastructure expansion as approaches for meeting rising demand while maintaining reliability and affordability. These are planning options, not a promise that a project can avoid network construction.
Efficiency can reduce the amount of electricity a facility needs for a given level of service. Storage can shift some electricity use across time, and flexible operation can allow demand to respond to grid conditions when operational requirements permit. Their value depends on the project, local constraints, and how the measures are implemented. If a constraint is a line or transformer that cannot carry the required power, a supply-side measure alone may not remove it.
How utilities determine what to build
The exact process depends on the connection and jurisdiction, but a local assessment needs to establish how the proposed load interacts with the network that will serve it. For a community trying to understand a project, the useful questions are not simply whether a data center is large, but which equipment is constrained, what service configuration is proposed, and how the resulting work is assigned.
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- Define the proposed load. The utility or provider needs the requested demand and the project’s expected ramp schedule. A facility that reaches its full demand quickly presents a different planning situation from one that brings load online in stages.
- Identify the connection and serving network. Find out whether the relevant study concerns local distribution facilities, the interstate transmission system, or both. The connection point determines which assets and providers are involved.
- Study capacity and constraints. The provider evaluates whether the existing network can serve the requested load and identifies the upgrades, if any, needed to address constraints. National forecasts cannot establish the headroom at a local substation or feeder.
- Evaluate alternatives and operating assumptions. Infrastructure, supply, storage, efficiency, and flexible operation can be considered together. Their feasibility and effect on construction needs must be established for the specific project.
- Determine approvals, schedule, and cost responsibility. These depend on the facilities involved, the applicable tariff and regulatory rules, and the project’s agreements. There is no defensible universal schedule or price for data-center grid upgrades.
DOE’s July 9, 2026 announcement concerned a draft National Transmission Needs Study. A draft study or a national needs assessment should not be treated as a final local project approval or as proof that a specific neighborhood needs a particular line.
Could a data center affect reliability or household bills?
It could affect local planning and investment, but the existence of a data center does not by itself establish that nearby customers will experience outages. Reliability depends on the local network, how the new load is connected and served, and whether needed infrastructure and operating arrangements are in place. A national estimate of electricity demand cannot determine a neighborhood’s outage risk.
Bills are also governed by local circumstances and rules. The cost of serving a new load may involve infrastructure or supply investments, but who pays and how costs are allocated depend on the utility’s tariffs, regulatory decisions, and project-specific arrangements. The reviewed national sources do not provide a reliable figure for how much any one data center raises local rates. A claim about household bills requires evidence from the relevant utility filings, rate proceedings, or project records.
For residents, the most informative documents are those that connect the project to local costs and facilities: utility or transmission-provider studies, proposed tariffs or service agreements where public, regulator filings, and decisions approving rates or construction. A project announcement or national demand projection alone cannot establish what customers in a particular area will pay.
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Who makes the decisions, and what is changing?
Responsibility is divided. Utilities and transmission providers study and plan the facilities they operate; state regulators and other authorities have roles depending on the issue and jurisdiction. The Federal Energy Regulatory Commission (FERC) regulates interstate transmission and regional grid operators under its jurisdiction, but that does not mean one federal decision resolves every local distribution, rate, or cost-allocation question.
On June 18, 2026, FERC announced tailored orders to the six regional grid operators under its jurisdiction, directing them to justify or reform tariff rules governing data centers and other large energy users. This is an active regulatory process, not evidence that every tariff question has been settled.
FERC’s docket RM26-4 concerns potential reforms for large loads interconnecting to the interstate transmission system. Its docket page, accessed October 10, 2026, describes large loads as generally greater than 20 MW. That is a general description of the docket’s subject—not a claim that every data center exceeds 20 MW, or a threshold that applies to every utility’s process. Whether a facility falls under a particular process depends on its connection and the relevant rules.
How to assess claims about a proposed project
When a project is proposed near you, separate verified local findings from broad claims about data centers as a class. A useful review looks for the source of each claim and whether it concerns the right network, customer group, and time period.
- For a claim about grid capacity: look for the utility or transmission-provider study identifying the constrained facility and the requested load it evaluates.
- For a claim about construction: check whether a specific line, substation, feeder, transformer, or generation project is identified, rather than inferred from a national forecast.
- For a claim about reliability: look for a local assessment explaining the effect under the planned connection and operating conditions. A general statement that demand is rising is not an outage forecast.
- For a claim about bills: seek the applicable tariff, rate filing, regulator decision, or other project-specific cost-allocation record. A construction estimate alone does not show which customers will pay.
- For a claim about timing: distinguish a proposed schedule from an approved and funded project schedule. The available national material does not set a universal construction timeline.
The most important distinction is between a grid-wide trend and a local finding. A data center can be a substantial new customer and may prompt significant investment, but the amount and type of work—and its implications for other customers—must be established through the local planning and regulatory process.
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