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For an AI data center that needs dependable nuclear-associated electricity in the late 2020s, fission is the practical choice. Operating reactors already supply the grid, and data-center operators have signed power-purchase agreements (PPAs) tied to existing or restarting units. Fusion is a credible long-term option, but no commercial fusion plant identified in the cited evidence is delivering grid electricity today. Its schedules, output and costs remain conditional on scientific, engineering, regulatory and financing milestones.
That does not make the technologies a simple winner-versus-loser comparison. A facility choosing power must weigh when electricity is needed, how much firm capacity is required, whether transmission exists, what the contract actually guarantees, and how the project handles licensing, cooling water, fuel, waste and construction risk. The decision is therefore operating or contractable fission now versus potentially transformative fusion later.
Why AI data centers are looking for firm electricity
AI training and inference clusters can add large, concentrated loads to a power system. The International Energy Agency (IEA) projects electricity generation serving data centers worldwide to increase from 460 TWh in 2024 to more than 1,000 TWh in 2030 and 1,300 TWh in 2035. Those are forecasts, not guarantees: actual demand will depend on how quickly facilities are built, how intensively accelerators are used and how much efficiency improves.
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In the IEA’s base-year mix, nuclear provided about 15% of data-center electricity, compared with roughly 27% from renewables and 26% from natural gas. Nuclear’s share is not a prescription for every site; it shows that fission is already part of the supply serving this load while demand is accelerating.
For a data-center owner, “firm” means electricity that can be scheduled around the clock, subject to the plant, grid and contract’s terms. It is different from buying an annual quantity of clean-energy certificates. A PPA can cover energy, capacity, attributes or some combination, so the contract must be examined rather than inferred from the word “nuclear.”
What fission can provide today
An operating global fleet
Fission splits heavy atomic nuclei and releases heat that makes steam, drives a turbine and produces electricity. The process is industrially mature. The World Nuclear Association recorded 2,667 TWh of nuclear generation in 2024, 398 GWe of operable capacity at the end of that year and an 83% average capacity factor for reactors that generated electricity. Those figures describe an operating fleet, not a forecast of future projects.
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Existing reactors can support a data center through the grid, a dedicated arrangement where permitted, or a PPA that assigns energy and environmental attributes. The physical electrons still follow the interconnected grid; the commercial structure determines what the buyer receives and pays for.
A documented data-center PPA model
The U.S. Energy Information Administration (EIA) reported in 2024 that Constellation announced a 20-year PPA to provide electricity associated with Three Mile Island Unit 1 to Microsoft data centers. EIA presented the arrangement as part of a broader search by data-center owners for large, reliable and emissions-free electricity sources. The example demonstrates that an operator can contract around an existing or restarting fission asset instead of waiting for a new reactor to be built.
Such an agreement does not remove ordinary delivery questions. The buyer still needs to verify the unit’s operating or restart status, interconnection, transmission path, outage provisions, replacement power, environmental attributes, curtailment rights, force-majeure language and the treatment of unexpected shutdowns. A long contract term also creates price and regulatory exposure that should be modeled over the facility’s useful life.
New reactors and small modular reactors
Small modular reactors (SMRs) are a future fission pathway, not a shortcut that bypasses project development. Their smaller unit size and factory-oriented designs are intended to simplify deployment, but a commercial project still needs a licensed design, site approvals, financing, manufacturing capacity, fuel, trained operators, security arrangements, grid interconnection and a plan for radioactive waste.
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The IEA expects nuclear to become increasingly important for data-center demand after 2030, when it expects the first U.S. SMRs to be commissioned. The agency also identifies financing, policy, workforce and supply-chain barriers. “Expected” is not the same as a guaranteed date: a delay in licensing, component delivery or financing can move the in-service date by years.
An SMR may eventually be located close to a large load, but proximity is not automatic. Emergency-planning zones, cooling-water availability, transmission design, local acceptance and the regulator’s requirements all affect siting. Until those issues are resolved for a specific project, an SMR announcement is a development plan rather than firm data-center capacity.
What fusion can provide today—and what remains unproven
Scientific progress is not commercial generation
Fusion joins light atomic nuclei at extreme temperatures. A successful plant would use the resulting heat to make electricity, but achieving a hot, stable plasma is only one part of the engineering problem. A power station must also handle neutron damage, first-wall and blanket materials, heat extraction, a dependable fuel cycle (including tritium where the design requires it), maintenance and a licensed balance of plant.
Research has reached important scientific milestones, yet commercial electricity remains a development target. The U.S. Nuclear Regulatory Commission (NRC) says the DOE is primarily responsible for advancing fusion energy. Its current FAQ notes that one company has a goal of providing electricity by 2028; a company goal is not evidence that a plant will deliver on that date. The same FAQ describes the U.S. fusion-machine regulatory framework created by the 2024 ADVANCE Act, establishing how the NRC will regulate these machines as the technology develops.
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The DOE’s 2024 Fusion Energy Strategy is organized around closing science and technology gaps, preparing for deployment and building partnerships. It is a roadmap for reaching commercial fusion, not proof that a commercial fleet is operating. The strategy signals public support and identifies work that must be completed, while leaving project schedules, costs and performance subject to demonstration results.
A prospective corporate offtake
Commonwealth Fusion Systems (CFS) and Google announced a planned 200 MW offtake from CFS’s first ARC power plant in Virginia. The announcement describes the arrangement as the largest direct corporate purchase agreement for fusion energy and ties the commitment to SPARC achieving net fusion energy and to subsequent ARC development. It is therefore prospective: the agreement references a plant still to be developed, not electricity currently delivered to a grid or data center.
A future fusion offtake can be strategically useful. It may give a developer a customer, revenue visibility and a reason to design output around a large industrial load. A buyer should nevertheless make the contract conditional on independently verified milestones, define commercial-operation and availability tests, specify replacement power and termination rights, and avoid counting unproven megawatts as available capacity in near-term expansion plans.
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Fission and fusion compared for an AI facility
| Decision axis | Fission | Fusion |
|---|---|---|
| Availability | Operating plants and existing PPAs can supply electricity, subject to grid and contract conditions. | Planned demonstrations and prospective offtakes; no commercial plant in the cited evidence is delivering grid power. |
| Late-2020s readiness | Possible through existing reactors, restarts or contracted grid supply. | Not established in the cited evidence. |
| 2030s potential | New SMRs may contribute if licensing, financing, manufacturing and supply chains align. | Could become significant if pilot plants meet plasma, materials, fuel-cycle, heat-extraction and regulatory milestones. |
| Output profile | Firm generation is demonstrated at fleet scale. | Firm generation is an intended product, not yet demonstrated commercially. |
| Main schedule risks | Licensing, construction, financing, fuel, workforce and interconnection. | Plasma performance, materials, tritium or other fuel-cycle systems, heat extraction, licensing, financing and first-of-a-kind construction. |
| How to read a contract | A PPA may reference an operating, restarting or otherwise identified fission asset; verify delivery and outage terms. | The Google-CFS arrangement references a plant still to be developed; treat capacity as conditional. |
| Best planning frame | Current deployment and a possible transition path through SMRs. | Conditional long-term option with potentially high upside. |
Reliability: what “24/7” really requires
Neither a reactor name nor a clean-energy label by itself guarantees uninterrupted service to servers. Reliability is a system property. The owner must combine the generation contract with transmission capacity, substations, switchgear, backup generation or storage, maintenance schedules and a plan for rare but consequential outages.
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The 83% average capacity factor reported by the World Nuclear Association for reactors that generated electricity in 2024 is fleet operating evidence. It does not mean every unit ran 83% of every hour, and it does not guarantee a particular plant’s future performance. Planned refueling outages, unplanned trips, grid constraints and restart conditions still matter. A data center should request the plant’s historical availability, outage history and replacement-power arrangements before assigning firm capacity.
Fusion reliability questions
A future fusion plant would need to prove not just a successful plasma pulse but repeatable operation, maintainable components, predictable heat removal and high availability over long periods. The cited evidence does not establish those commercial operating metrics. Until a pilot demonstrates them, a buyer should treat fusion output as an option for a later expansion phase rather than the sole source for a near-term cluster.
Schedule and deployment choices
If the facility must be energized in the late 2020s
- Start with the grid and existing generation. Identify substations, transmission headroom and nearby operating or restarting reactors. A nuclear PPA can be evaluated alongside other firm sources without assuming a new plant will arrive on schedule.
- Match the contract to the load shape. Specify hourly or shaped energy, capacity obligations, outage replacement, congestion treatment and environmental attributes. Confirm whether the agreement covers the data center’s actual region and delivery node.
- Retain physical resilience. Engineer redundant feeds, on-site backup and black-start or ride-through capabilities appropriate to the AI workload. A PPA is not a substitute for electrical redundancy.
- Use staged expansion. Bring servers online in blocks tied to verified interconnection and generation milestones instead of assuming the full campus will be powered on day one.
If the target date is the 2030s
Keep existing fission contracts in the base plan while monitoring SMR projects and fusion demonstrations. An SMR option becomes more credible when the design is licensed, the site has permits, major components are ordered, financing is closed and a construction schedule has contingency. A fusion option becomes more credible when a pilot has achieved the promised net-energy and power-cycle milestones, obtained the required approvals and demonstrated maintainable operation.
If the project can wait beyond the first commercial demonstrations
Reserve expansion rights and interconnection capacity, then define objective technology gates. A gate might require independently verified net electric output, a specified continuous-availability period, fuel-cycle validation, a heat-rejection design, a regulator-approved operating envelope and a bankable price. This preserves access to fusion’s potential without putting today’s service-level commitments on an unproven plant.
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Cost and price certainty: use scenarios, not invented comparisons
The cited official sources do not provide a directly comparable current levelized cost of electricity for fission versus fusion dedicated to AI data centers. Any article or proposal that presents a single authoritative “cheapest” number without specifying technology, financing, construction date, capacity factor, fuel, decommissioning, transmission and backup assumptions is overstating the evidence.
A useful financial model separates costs that are often blended together:
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- Energy price: the PPA or tariff charge for delivered megawatt-hours.
- Capacity and grid charges: payments for reserved delivery capability, interconnection, transmission and congestion.
- Firming and backup: batteries, generators, replacement power and fuel needed during outages or mismatches.
- Development and construction: licensing, site work, reactor island, turbine equipment, cooling systems and contingency.
- Lifecycle obligations: fuel, operations, staffing, security, radioactive-waste management and eventual decommissioning for fission; for fusion, component replacement, fuel-cycle systems, maintenance and decommissioning provisions.
- Schedule value: the revenue lost when a data-center hall cannot operate because its promised power is late.
Model at least three cases: an existing-reactor PPA with documented delivery, a delayed or more expensive SMR, and a fusion plant that reaches commercial operation later than its target—or does not reach it. Include sensitivity to capacity factor, outage duration, interconnection delay, financing cost and the price of replacement electricity. This approach can show when a higher nominal energy price is preferable to a lower but uncertain project price.
Siting, water, fuel and waste questions
Transmission and interconnection
A reactor can be nearby yet unusable for a data center if the transmission corridor or substation lacks capacity. Queue position, upgrade responsibilities, congestion and curtailment rights should be documented before a site is selected. A contract for generation associated with a reactor does not automatically reserve a physical delivery path to a new campus.
Cooling and water
Both fission plants and future fusion plants must reject substantial heat. The selected cooling technology, water source, discharge limits, drought exposure and competing local uses affect permits and operating cost. Data-center cooling adds another large thermal and water-management system, so the combined site design must be evaluated rather than treating reactor cooling as an isolated issue.
Fuel and supply chains
Fission projects depend on qualified fuel, reactor components, specialized manufacturing and a trained workforce. SMR schedules are particularly exposed to first-of-a-kind manufacturing and supply-chain constraints. Fusion projects add their own uncertainties around plasma-facing materials, high-performance magnets or other design-specific components, and fuel-cycle systems such as tritium handling where applicable.
Waste and end-of-life obligations
Fission produces radioactive fuel and other regulated waste that require established handling, storage and disposal arrangements. Fusion is not waste-free: activated materials and contaminated components can require regulated management, even though the waste profile differs from that of fission fuel. A procurement team should request a full lifecycle plan for either technology, including who pays and who remains responsible if the operator or project company changes.
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Regulatory pathways differ by jurisdiction and by reactor or fusion-machine design. In the United States, the NRC’s current fusion FAQ describes the framework created by the 2024 ADVANCE Act, while the DOE leads much of the federal fusion-development effort. That division does not eliminate permitting; it means a buyer must identify which agency reviews the machine, site, environmental impacts, grid connection, worker safety and emergency arrangements.
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- the named generating unit, ownership and operating or restart status;
- delivery node, transmission rights and congestion allocation;
- capacity, energy and environmental-attribute definitions;
- planned-outage and forced-outage replacement provisions;
- commercial-operation tests, availability guarantees and damages;
- change-in-law, license-renewal, decommissioning and force-majeure terms;
- termination rights if the reactor or interconnection is delayed.
For a prospective fusion offtake, add milestone conditions for net fusion energy, plant construction, licensing, grid interconnection, continuous operation, maintainability and independently verified net electric output. Define what happens if a target year slips, if the plant produces less than 200 MW, or if the demonstration succeeds scientifically but cannot achieve bankable commercial availability.
A practical decision framework
Choose fission now when these conditions apply
- The data center must serve customers in the late 2020s.
- The site can access an operating or restarting reactor through a credible grid and PPA structure.
- The business can accept nuclear fuel, waste, security and regulatory obligations.
- Reliability requirements call for demonstrated firm generation rather than a technology milestone.
- The project can finance transmission, backup and cooling independently of a new reactor build.
Consider an SMR option when these conditions apply
- Load growth extends into the 2030s or later.
- A specific design has a credible licensing and supply-chain path.
- The site has water, transmission, emergency-planning and community approvals available.
- Financing can absorb construction delay and first-of-a-kind cost risk.
- The contract makes capacity conditional on objective project milestones.
Keep fusion as a staged long-term option when these conditions apply
- The operator can meet near-term demand with existing grid contracts or other firm resources.
- Expansion halls can be scheduled after a pilot plant demonstrates continuous commercial operation.
- The buyer is prepared to fund development risk without counting unbuilt megawatts toward current reliability obligations.
- The offtake includes milestone-based pricing, replacement power and termination protections.
Common mistakes and how to avoid them
Counting an announcement as delivered electricity
A signed or announced offtake can support a project, but it does not prove that electrons are flowing. Label every megawatt as operating, under construction, permitted, financed, planned or merely targeted. The 200 MW CFS-Google arrangement belongs in the prospective category.
Comparing a fleet statistic with a plant forecast
The World Nuclear Association’s 2024 generation and capacity-factor figures describe operating fission reactors. They cannot be compared directly with a planned ARC output or a company fusion target without labeling the difference between measured fleet performance and forecast project performance.
Assuming “nuclear” means islanded power
Most PPAs settle through the grid. Confirm physical interconnection, delivery obligations and backup before claiming that a campus is directly powered by a particular reactor.
Ignoring non-energy constraints
Transmission, water, workforce, waste, security and permitting can stop a project even when the reactor technology works. Include each constraint in the site-selection schedule and financial model.
Using a single cost number
Without a comparable, current fission-versus-fusion cost study for this use case, a single figure hides assumptions. Publish the assumptions, run sensitivity cases and include the economic cost of a late energization date.
What the evidence supports
AI electricity demand is growing quickly enough that operators are pursuing large supplies of firm, emissions-free electricity. Fission already supplies the grid at scale and has documented data-center PPAs, making it the realistic nuclear-associated route for late-2020s projects. SMRs could expand that role after 2030 if licensing, financing, workforce and supply chains align.
Fusion has serious government planning, private investment and a potential corporate customer, but commercial delivery remains unproven in the cited evidence. Its value today is as a monitored, milestone-based option for later capacity—not as a substitute for power that an AI facility must have this decade. A disciplined buyer should contract proven or contractable fission for near-term reliability, preserve optionality for SMRs, and treat fusion commitments as conditional until a plant demonstrates licensed, maintainable and bankable electric output.
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