Nuclear power for data centers is the only energy source that combines 90%+ capacity factor baseload reliability, zero operational carbon emissions, and the energy density to serve gigawatt-scale AI campuses from a single site. Here is why every major hyperscaler is pursuing nuclear and how it affects your infrastructure decisions.
Why Data Centers Need Nuclear Power
You cannot run a 500 MW AI training campus on solar and wind alone. Solar delivers a 25% capacity factor, producing an average of 125 MW from a 500 MW installation. Wind reaches 35%. Nuclear operates at 93.5% capacity factor in the US, according to the Energy Information Administration. That consistency matters because AI inference runs 24/7/365 with no tolerance for intermittency.
The AI energy crisis has made this math unavoidable. Grid interconnection queues in Northern Virginia exceed 40 GW, with wait times beyond five years. Nuclear power bypasses the grid bottleneck by generating electricity at the point of consumption.
The Microsoft Three Mile Island Deal That Changed Everything
In September 2024, Microsoft signed a 20-year power purchase agreement with Constellation Energy to restart Three Mile Island Unit 1. The deal delivers 835 MW of carbon-free baseload power. Constellation committed $1.6 billion to refurbish the reactor, with operations expected by 2028.
The Microsoft Three Mile Island deal triggered an industry cascade. Within six months, Amazon secured 960 MW of nuclear capacity across three agreements. Google signed with Kairos Power for 500 MW of small modular reactor capacity. Oracle announced plans for a data center powered by three SMRs totalling over 1 GW.
Nuclear Commitments by Hyperscaler
| Company | Partner | Capacity (MW) | Type | Online |
|---|---|---|---|---|
| Microsoft | Constellation Energy | 835 | Reactor restart | 2028 |
| Amazon | Talen / X-energy | 960 | Existing + SMR | 2025-2031 |
| Kairos Power | 500 | SMR new build | 2030 | |
| Oracle | Undisclosed | 1,000+ | SMR new build | 2032 |
Combined, these commitments exceed 3.3 GW of nuclear capacity dedicated to data centers.
Small Modular Reactors: The Data Center Power Plant
Small modular reactors for data centers generate 50 to 300 MW per module, matching individual campus power profiles. You deploy one module and add more as demand grows, avoiding billions in upfront capital for unused capacity.
NuScale holds the only US NRC design certification for an SMR at 77 MW per module. X-energy’s Xe-100 delivers 80 MW with higher thermal efficiency. Kairos Power’s KP-FHR produces 75 MW at lower pressures and reduced construction costs. No SMR has achieved commercial operation in the US as of early 2026, with the earliest deployments projected for 2030 to 2032.
What Nuclear Means for Your Data Center Strategy
If you are planning AI infrastructure operational beyond 2028, nuclear availability should factor into site selection. Locations near existing plants or approved SMR sites will have a structural power advantage over grid-dependent markets.
Natural gas prices swing between $2 and $9 per MMBtu. Nuclear fuel costs are stable and represent only 10% of total operating cost, compared to 70% for gas generation. A 20-year nuclear PPA locks in predictable energy costs while gas-dependent facilities face pricing uncertainty that directly affects your margins.
Frequently Asked Questions
Is nuclear power safe enough to operate next to data centers?
Modern reactor designs incorporate passive safety systems that shut down without operator intervention or external power. SMRs operate at lower pressures and temperatures than traditional reactors. Multiple data centers already operate within 10 miles of active US nuclear plants.
How long does it take to build a nuclear-powered data center?
Restarting an existing reactor takes 3 to 5 years. New SMR construction is projected at 5 to 7 years from licensing to operation. Grid interconnection in Northern Virginia now takes 4 to 6 years, making nuclear timelines competitive.
Can renewables replace nuclear for data center baseload?
Providing 500 MW of 24/7 power from solar plus storage requires approximately 2,000 MW of panels and 4,000 MWh of batteries, costing $4 to $6 billion. A 500 MW nuclear plant costs $3 to $4 billion and operates for 60 to 80 years versus 25 to 30 for solar panels.