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There is no single best power source for every data center. Nuclear can provide continuous, low-carbon generation; natural gas can be dispatched when needed; and wind and solar can scale quickly but vary with weather and time of day. The practical choice depends on where a facility is built, when power must be available, what the local grid can deliver, and whether the operator is buying physical electricity, capacity, or a contractual claim on generation.
How much electricity do data centers use, and how fast could demand grow?
The International Energy Agency (IEA) estimates that data centers consumed 415 terawatt-hours (TWh) of electricity worldwide in 2024, about 1.5% of global electricity use. Its 2025 base case projects data-center consumption of around 945 TWh in 2030. These are global estimates, not a forecast for any one country or facility. The IEA identifies AI as a major source of growth alongside other digital services, while noting that efficiency, construction rates, grid development, and infrastructure bottlenecks could change the outlook. IEA, “Executive summary – Energy and AI” (2025)
That growth does not translate into a simple contest in which one technology replaces the others. A data center needs electricity where and when it operates; generation projects, transmission, interconnection, storage, and grid operations determine whether a source can serve that need.
What powers data centers today?
The IEA estimates the current physical electricity supply mix for data centers—not the mix represented by operators’ power contracts—as follows. The global percentages are approximate; the renewable category groups wind, solar PV, and hydro, so the IEA figure does not establish separate global shares for wind and solar.
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| Region | Coal | Renewables | Natural gas | Nuclear |
|---|---|---|---|---|
| Global data-center physical supply | About 30% | About 27% | About 26% | About 15% |
| U.S. data-center physical supply | About 15% | 24% | Over 40% | Around 20% |
These estimates include electricity from onsite generation and the local grid mix. They should not be read as a tally of renewable-energy certificates or power-purchase agreements (PPAs). The regional figures also cannot tell a reader what serves a particular data center: that depends on its grid connection and procurement arrangements. IEA, “Energy supply for AI – Energy and AI” (2025)
How are the four sources expected to meet new demand?
In its 2025 outlook, the IEA expects renewables to meet nearly half of additional global data-center electricity demand through 2030. It projects renewable generation for data centers to grow at an average annual rate of 22% from 2024 to 2030. Natural gas and coal together are expected to supply over 40% of the additional demand in that period. These are projections, not guarantees for individual projects.
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The IEA expects nuclear’s contribution to grow later in the outlook, with initial small modular reactors (SMRs) expected to begin contributing around 2030. That timing makes a proposed new reactor a different near-term option from power available from an existing plant. In the United States, the IEA projects natural gas will add over 130 TWh of annual data-center generation by 2030, and renewables will add 110 TWh from 2024 to 2030. These are U.S. generation projections from the IEA, not site-level supply commitments. IEA, “Energy supply for AI – Energy and AI” (2025)
How do nuclear, gas, wind, and solar compare?
| Source | What it can contribute | Key questions for a data-center project |
|---|---|---|
| Nuclear | Continuous generation with no direct CO₂ emissions at the plant. Existing nuclear plants can supply firm power; new SMRs are a later-decade prospect in the IEA outlook. | Is the proposal for output from an existing plant or a new build? What are the schedule, licensing, financing, interconnection, and contract risks? Does the agreement cover energy, capacity, or both? |
| Natural gas | Dispatchable generation that can be called on when needed. The IEA expects it to contribute substantially to near-term data-center demand growth; EIA modeling also identifies it as a major potential source of incremental U.S. generation under faster demand growth. | Is there sufficient local fuel and pipeline capacity? How exposed is the project to fuel prices? What are its emissions, expected operating hours, plant lead time, and interconnection needs? |
| Wind | A growing renewable source in the IEA’s demand outlook. Output varies with wind conditions, so its contribution depends on the project location and how it is integrated with the grid. | How does output line up with the facility’s hourly load? What transmission, interconnection, storage, or other grid resources are required? |
| Solar | A growing renewable source in the IEA’s demand outlook. The U.S. Department of Energy describes solar as rapidly scalable and cost competitive; output varies with sunlight. | What is the local solar resource and its hourly match to demand? What transmission, interconnection, storage, or other grid resources are needed? |
The U.S. Department of Energy (DOE) describes wind and solar as rapidly scalable and cost competitive, and identifies storage, grid upgrades, efficiency, and demand resources as ways to help address system needs. That is not a delivered-cost comparison for a particular data-center site. The cited sources do not establish a universal cost ranking across nuclear, gas, wind, and solar; actual project economics depend on location, construction and interconnection requirements, contracts, and operating assumptions. DOE, “Clean Energy Resources to Meet Data Center Electricity Demand”
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Wind and solar output varies, but that does not by itself determine whether a data center can procure electricity from them. A project can be part of a portfolio involving grid supply, storage, contracts, and other resources. Conversely, a renewable contract does not on its own show that a specific plant supplies the facility at every hour.
What does “powering a data center” mean in a contract?
Physical supply and contracted procurement are different measures. The IEA’s mix describes electricity physically consumed, including onsite generation and the local grid. A PPA or other agreement can support a generator or give a buyer contractual rights, but its stated capacity is not automatically equal to the buyer’s total energy use or proof of simultaneous delivery to the facility.
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The U.S. Energy Information Administration (EIA) describes two nuclear procurement examples:
- Constellation Energy agreed to supply Microsoft data centers in the mid-Atlantic region for 20 years using generation from Three Mile Island Unit 1.
- Amazon Web Services (AWS) agreed to take 960 megawatts (MW) of capacity from Talen Energy’s Susquehanna nuclear plant, with capacity increases in 120-MW increments over multiple years and an option to cap the commitment at 480 MW.
EIA notes that contracted capacity does not necessarily equal total energy consumed, and that a PPA need not require a data center to be co-located with the generator or to consume its output at the same time it is produced. These examples illustrate procurement approaches; they do not establish that every data center can obtain the same terms. EIA, “Data center owners turn to nuclear as potential electricity source” (October 1, 2024)
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What should a data-center operator compare before choosing?
A useful comparison starts with the facility’s requirements and the specific grid location, rather than a technology label alone.
- Define the load and timing. Estimate how much electricity the site will need and when. Data centers often need continuous firm supply, and some face regional or latency constraints that limit where they can locate. EIA notes that data-center demand does not fluctuate during the day in the same way as demand from residences or many other businesses. EIA (October 1, 2024)
- Check what can connect to the site. Assess available grid capacity, interconnection timelines, transmission constraints, and whether onsite generation or storage is feasible. A source that exists elsewhere may not solve a local delivery constraint.
- Separate energy from firm capacity. Ask whether an offer supplies megawatt-hours of energy, guaranteed capacity, or both, and how the facility is covered when a variable generator is not producing.
- Test the delivery schedule. Existing generation, new plants, renewable projects, grid upgrades, and storage have different development and connection timelines. A new nuclear project should not be treated as equivalent to available generation from an operating plant.
- Account for fuel and emissions. For gas, evaluate fuel availability and price exposure as well as emissions. For nuclear, distinguish the operating characteristics of existing plants from the delivery and project risks of new capacity. For wind and solar, consider the production profile and resources needed to integrate it.
- Compare full project costs and contract terms. Include the costs and risks of generation, transmission, interconnection, storage, and firming—not just a quoted generation price. Check contract duration, volume, delivery location, and what happens when output and demand do not coincide.
The DOE’s 2024 webpage cites an Electric Power Research Institute estimate that data centers could use up to 9% of U.S. electricity generation annually by 2030, compared with 4% in 2023. This is an attributed estimate, not a DOE forecast. Separately, EIA’s 2026 high-demand analysis assumes natural gas is the primary available source of incremental generation in its scenario; it is a scenario result, not a universal prediction that gas will serve every new facility. DOE webpage · EIA, “Fossil generation could rise with faster-than-expected growth in data center power demand” (2026)
Which source is best for a data center?
The answer is conditional. Nuclear is a strong fit when continuous low-carbon generation is the priority and suitable existing or deliverable capacity is available. Gas can provide dispatchable generation and is expected to play a substantial near-term role, but brings fuel-market exposure and emissions. Wind and solar can contribute significantly to new supply, but their output profiles must be managed through grid integration, storage, contracts, and other resources. For an actual site, compare deliverable power, timing, firm capacity, emissions, and total system requirements—not nameplate capacity or a contract label in isolation.
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