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A semiconductor fabrication plant can add a large, steady electricity load, but its effect on the local grid depends on the facility and the site. Power is needed not only for wafer-processing tools but also for cleanroom air, cooling, gas systems and other support equipment. Whether a new fab requires grid upgrades—or affects other customers’ costs—can only be determined through location-specific utility and grid studies.
How much electricity does a semiconductor fab use?
There is no single figure that describes every fab. In its 2024 assessment, the National Institute of Standards and Technology (NIST) reported a median annual energy use of approximately 2.74 million megawatt-hours (MWh) among a sample of 29 fabs in 2021. That is a sample median, not a forecast or a standard consumption figure for a proposed facility. A fab’s production capacity, process mix, operating profile and energy efficiency all affect its use. NIST’s assessment provides the source and context for that estimate.
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Annual energy and instantaneous demand are different measurements. MWh describe energy used over time; megawatts (MW) describe the rate of electricity use at a particular moment. To assess a proposed fab’s grid impact, its requested peak MW and expected annual MWh are both relevant. One cannot be derived reliably from the other without the facility’s operating profile.
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Electricity runs both the wafer-processing equipment and the systems that maintain the conditions manufacturing requires. NIST identifies lithography, etching and deposition among energy-intensive process steps. Supporting loads include vacuum pumps, exhaust-abatement equipment, nitrogen generation and gas purification, cleanroom air circulation, and temperature and humidity control.
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A historical survey by the Electric Power Research Institute (EPRI) of 14 fabs illustrates how those demands can be distributed. In that surveyed group, process tools used over 40% of electricity, chillers about 25%, and recirculating air units about 11%. Thin films, dry etch, thermal processing and patterning were among the major process-area users. These are findings from a limited historical sample, not current industry-wide shares or a prediction for a particular fab. EPRI’s survey also discusses efficiency approaches observed in the surveyed facilities.
Can a fab strain the local electricity grid?
A large new load can require the utility and grid operator to evaluate connection capacity, transmission service, generation adequacy and reliability. The consequences depend on the site’s existing network and the fab’s requested load and operating characteristics. Depending on those conditions, upgrades might be needed to substations, transmission lines or other grid infrastructure; a fab does not automatically require any particular upgrade.
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The Federal Energy Regulatory Commission (FERC) is addressing how large loads connect to the interstate transmission system. Its RM26-4 docket covers issues such as study timelines, flexible or curtailable service, the allocation of upgrade costs, and arrangements where a generator is located with a large customer. The docket is a developing regulatory process, not a final rule establishing the same requirements for every project.
On June 18, 2026, FERC directed six regional grid operators to justify or revise tariffs addressing large users, including manufacturing facilities. The proceedings cover transmission studies, cost transparency and preventing cost shifting, co-located or behind-the-meter generation, flexible service for large loads, and studies for generation serving electrically nearby loads. FERC described the actions as tailored to regional circumstances rather than a single nationwide solution. The Commission’s release describes the action and its scope.
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Will a new fab raise local electricity prices or cause outages?
Not necessarily—and the available evidence does not establish a universal answer. Whether a project changes household or business bills depends on local utility filings, rate decisions, resource plans, grid studies and how any required upgrades are allocated. Likewise, the existence of a large new load alone does not show that a region will experience shortages or blackouts. Those conclusions require evidence about the specific grid and project.
For a proposed fab, the most useful questions are what load it requests, how quickly it will ramp up, what network upgrades are needed, and who is responsible for their cost. Co-located generation or demand flexibility may be part of a project’s arrangements, but neither should be assumed without site-specific information.
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- INSTALLS IN CIRCUIT PANEL of most homes with clamp-on sensors. Supports Single phase, Single-split phase, and 2-wire systems. 3-wire systems; 3-phase, 4-wire Wye systems with earthed (TN or TT) neutral (no-Delta) are supported with an additional 200A sensor (sold separately).
- 24/7 ENERGY MANAGEMENT AND MONITORING: Automate, manage and control your home's real power anywhere, anytime to prevent costly repairs, conserve energy, and save costs. Monitor solar / net metering. PROTECTED BY A 1-YEAR WARRANTY.
- LOWER YOUR ELECTRIC BILL: Configure settings in the Emporia Energy App to automate energy management for time of use, peak demand, excess solar, and rewards programs. You can even see live reporting and invaluable savings opportunities instantly. Gauge real-time spending and get actionable notifications and automated energy management to help you reduce costs.
- REAL-TIME ENERGY DATA: REQUIRES 2.4 GHz WIFI WITH AN INTERNET CONNECTION to monitor energy use with iPhone / Android / Web app. Vue sensors collect energy data and are accurate from ±2%. The Vue is UL and CE Listed for your safety. 1 second data is only available in the app (when actively open) and retained 3 hours. Minute and hour data are retained in the cloud. 1 minute data is retained 7 days, 1 hour data is retained indefinitely. Export cloud data whenever you want in the app.
Why power quality and reliability matter to production
Fabs need reliable power because an interruption or voltage sag can disrupt manufacturing and waste batches, NIST says. Many facilities use uninterruptible power supply (UPS) equipment to bridge short interruptions while utility service returns or generators take over. A UPS provides a limited-duration bridge; it should not be mistaken for a system that can run an entire fab indefinitely.
Efficiency measures can reduce electricity use, but their impact varies by facility. EPRI’s historical survey associated better energy performance with factors including monitoring, efficient motors and variable-speed drives. Those observations do not establish a guaranteed savings level for a new project, and efficiency does not replace the need to plan for adequate grid capacity.
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What to compare when evaluating fab proposals or sites
Comparisons are most useful when they keep the facility’s demand distinct from the local grid’s ability to serve it. For each proposal, look for:
- Requested peak demand in MW and expected annual energy use in MWh, stated separately.
- The expected ramp-up schedule and the facility’s operating profile.
- Available local transmission and generation capacity, as established in relevant utility or grid studies.
- Required connection upgrades and the proposed allocation of their costs.
- Backup arrangements, any co-located generation, and whether demand can be curtailed or shifted.
- Energy use per unit of production and the efficiency measures planned.
These details help distinguish a fab’s size from the grid work needed at a particular location. They also make clear which claims about costs, reliability or capacity are supported by project-specific evidence.
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