Data Center Co-Location with Nuclear Calculator
Co-locating an always-on AI data center directly with a nuclear plant is one of the most consequential ideas in the AI infrastructure boom — and unlike variable renewables, nuclear's near-continuous output makes coverage percentage a far more meaningful planning number. This calculator compares a nuclear plant's real annual energy output (capacity × 8760 × capacity factor) against a data center's annual energy demand (continuous load × 8760), then shows the coverage percentage, the energy surplus or gap, and the maximum continuous data center load the plant can support on an annual-energy basis. It pairs naturally with our Wind-to-Data Center Co-Location Sizing Calculator for the variable-resource counterpart, and our Nuclear Plant Capacity Factor & Output Calculator for the generation side of the same plant.
1,100 MW is representative of a large single-unit nuclear reactor; SMR modules range from 50-470 MWe and are often combined for larger total capacity.
The U.S. nuclear fleet has averaged 92-93% capacity factor in recent years -- the highest of any major generation source, and far above wind (~33-36%) or solar (~24%).
The continuous megawatts the data center is designed to draw -- a hyperscale AI campus, colocation build, or HPC facility. Large campuses can reach hundreds of MW to over a gigawatt.
nuclear plant capacity (MW) × 8760 × (capacity factor (%) ÷ 100)
target data center continuous load (MW) × 8760
(annual nuclear output ÷ annual data center demand) × 100
annual nuclear output − annual data center demand — surplus energy available for export, storage, or additional load
annual nuclear output (MWh/year) ÷ 8760 — the firm-equivalent continuous capacity of the plant
Results update live as you type. For planning and field-check estimates — always verify against applicable standards and equipment ratings.
How we calculate this →Nuclear's near-continuous output makes coverage percentage a much more meaningful number than it is for variable resources: a 1,100 MW plant at 92.5% capacity factor can fully cover a 900 MW continuous data center load with a 13% surplus, supporting up to roughly 1,017 MW of continuous demand on an annual-energy basis. Compare that to a wind farm co-location scenario, where even a large wind resource often covers only 60-70% of an equivalent continuous data center load due to intermittency -- nuclear's high, steady capacity factor is exactly why it's drawing such intense interest as a dedicated power source for always-on AI infrastructure.
How data center co-location with nuclear is calculated
This calculator compares a nuclear plant's real annual energy output against a data center's annual energy demand, then derives the coverage percentage, the energy surplus or gap, and the maximum continuous load the plant can support. Three inputs drive everything.
Annual Nuclear Output (MWh/year) = Nuclear Plant Capacity (MW) × 8760 × (Nuclear Plant Capacity Factor (%) ÷ 100). Multiplying the nameplate capacity by the 8,760 hours in a year gives the theoretical maximum energy if the plant ran at full output continuously; the capacity factor converts that into real annual production. At the defaults (1,100 MW and 92.5% capacity factor), that is 1,100 × 8,760 × 0.925 = 8,913,300 MWh/year.
Annual Data Center Demand (MWh/year) = Target Data Center Continuous Load (MW) × 8760. A data center running a continuous load draws that same megawatt figure every hour of the year, so annual demand is simply the continuous load times 8,760 hours. At the default 900 MW target load, that is 900 × 8,760 = 7,884,000 MWh/year.
Coverage (%) = (Annual Nuclear Output (MWh/year) ÷ Annual Data Center Demand (MWh/year)) × 100. This is the share of the data center's annual energy that the nuclear plant's output can cover on an annual-energy basis. At the defaults, 8,913,300 ÷ 7,884,000 = 113.0% — the plant generates more energy annually than the load needs, producing a surplus rather than a gap.
Energy Surplus or Gap (MWh/year) = Annual Nuclear Output (MWh/year) − Annual Data Center Demand (MWh/year). A positive result is surplus energy available for export, storage, or additional load; a negative result is the shortfall the nuclear plant cannot cover, which must come from the grid or backup generation. At the defaults, 8,913,300 − 7,884,000 = 1,029,300 MWh/year surplus.
Max Supportable Continuous Data Center Load (MW) = Annual Nuclear Output (MWh/year) ÷ 8760. This is the firm-equivalent continuous capacity of the nuclear plant — the continuous megawatts it could supply if its annual energy were spread evenly across the year. At the defaults, 8,913,300 ÷ 8,760 = 1,017.5 MW, meaning a 1,100 MW / 92.5% nuclear plant can support roughly 1,017 MW of continuous demand on an annual-energy basis. Because nuclear's capacity factor is so high, this firm-equivalent figure sits very close to the plant's nameplate rating — a sharp contrast to wind or solar co-location, where the firm-equivalent load is a small fraction of nameplate.
Two notes on the model. First, this is an annual energy planning estimate: it compares total annual production against total annual demand and does not model hourly matching, refueling-outage scheduling, transmission constraints, or backup sizing — even at a 92.5% capacity factor, the roughly 7.5% of hours the plant isn't generating (mainly scheduled refueling outages) still require backup, grid interconnection, or storage for a data center demanding true uninterrupted power. Second, coverage above 100% on an annual basis does not mean the plant covers the load every single hour; it means annual energy output exceeds annual demand, which is a necessary but not sufficient condition for full hourly matching. Data sources: Nuclear capacity factor benchmarks from EIA (Energy Information Administration) and NERC data; data center power demand profiles from industry technical documentation and hyperscaler announcements; Microsoft Three Mile Island / Crane Clean Energy Center agreement from Microsoft and Constellation Energy public filings; Amazon X-energy, Google Kairos Power SMR commitments from company announcements and DOE (Department of Energy) documentation; SMR module capacity ranges from vendor technical specifications; data center backup power requirements from industry standards and technical guidelines. Verification: with defaults (1,100 MW plant, 92.5% CF, 900 MW target DC load), Annual Nuclear Output = 8,913,300 MWh/year, Annual Data Center Demand = 7,884,000 MWh/year, Coverage = 113%, Energy Surplus = 1,029,300 MWh/year, Max Supportable Continuous Load = 1,017 MW.