Data Center Co-Location with Geothermal Calculator
Co-locating an always-on AI data center directly with a geothermal plant pairs two remarkably well-matched load profiles: geothermal's steady, weather-independent, high-capacity-factor output against a data center's continuous, 24/7 demand. This calculator compares a geothermal 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 Data Center Co-Location with Nuclear Calculator for comparison to another firm-power co-location option, and our Geothermal Power Plant Output Calculator for the generation side of the same plant.
400 MW is representative of a large modern Enhanced Geothermal System (EGS) project, similar in scale to Fervo Energy's Cape Station development in Utah.
Geothermal plants commonly achieve 85-95%+ capacity factor -- among the highest of any generation source, rivaling nuclear, since geothermal heat is available continuously regardless of weather or season.
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.
geothermal plant capacity (MW) × 8760 × (capacity factor (%) ÷ 100)
target data center continuous load (MW) × 8760
(annual geothermal output ÷ annual data center demand) × 100
annual geothermal output − annual data center demand — surplus energy available for export, storage, or additional load
annual geothermal 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 →Geothermal's steady, firm output makes it a genuinely strong fit for always-on data center demand -- a 400 MW plant at 90% capacity factor comfortably covers a 350 MW continuous data center load with a 2.86% surplus, supporting up to roughly 360 MW of continuous demand on an annual-energy basis. This isn't just theoretical: Google signed one of the first major corporate agreements for enhanced geothermal power specifically to help meet its data center electricity needs, and Fervo Energy's Cape Station project has secured offtake agreements including 373 MW with Southern California Edison. As AI-driven data center demand keeps pushing developers toward firm, carbon-free power sources, geothermal's combination of high capacity factor and (unlike nuclear or gas) zero fuel supply chain risk is drawing increasing attention.
How data center co-location with geothermal is calculated
This calculator compares a geothermal 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 Geothermal Output (MWh/year) = Geothermal Plant Capacity (MW) × 8760 × (Geothermal 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 (400 MW and 90% capacity factor), that is 400 × 8,760 × 0.90 = 3,153,600 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 350 MW target load, that is 350 × 8,760 = 3,066,000 MWh/year.
Coverage (%) = (Annual Geothermal Output (MWh/year) ÷ Annual Data Center Demand (MWh/year)) × 100. This is the share of the data center's annual energy that the geothermal plant's output can cover on an annual-energy basis. At the defaults, 3,153,600 ÷ 3,066,000 = 102.9% — the plant generates slightly more energy annually than the load needs, producing a small surplus rather than a gap.
Energy Surplus or Gap (MWh/year) = Annual Geothermal 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 geothermal plant cannot cover, which must come from the grid or backup generation. At the defaults, 3,153,600 − 3,066,000 = 87,600 MWh/year surplus.
Max Supportable Continuous Data Center Load (MW) = Annual Geothermal Output (MWh/year) ÷ 8760. This is the firm-equivalent continuous capacity of the geothermal plant — the continuous megawatts it could supply if its annual energy were spread evenly across the year. At the defaults, 3,153,600 ÷ 8,760 = 360.0 MW, meaning a 400 MW / 90% geothermal plant can support roughly 360 MW of continuous demand on an annual-energy basis. Because geothermal'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, maintenance-outage scheduling, transmission constraints, or backup sizing — even at a 90% capacity factor, the roughly 10% of hours the plant isn't generating at full output (mainly scheduled maintenance) 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: Geothermal capacity factor ranges (85-95%+) from DOE (Department of Energy), NREL (National Renewable Energy Laboratory), and EIA (U.S. Energy Information Administration) geothermal plant performance data; Google-Fervo Energy enhanced geothermal agreement from company announcements and DOE documentation; Fervo Energy Cape Station project 373 MW Southern California Edison offtake agreement and 500 MW total capacity target from Fervo Energy public reporting and utility disclosures; data center power demand profiles from industry technical documentation and hyperscaler announcements; data center backup power requirements from industry standards and technical guidelines. Verification: with defaults (400 MW plant, 90% CF, 350 MW target DC load), Annual Geothermal Output = 3,153,600 MWh/year, Annual Data Center Demand = 3,066,000 MWh/year, Coverage = 102.9%, Energy Surplus = 87,600 MWh/year, Max Supportable Continuous Load = 360 MW.