Nuclear Is Back — and Silicon Valley Is Paying For It

Ten years ago, a tech company signing a long-term deal with a nuclear plant would have been a strange headline. In 2026, it's routine — and it's happening because the industry that once treated nuclear as a legacy liability now can't build data centers fast enough without it.

The number that explains everything

U.S. data centers are now consuming an estimated 183 terawatt-hours of electricity annually — more than the entire state of Ohio uses in a year. AI-specific demand is compounding on top of that base load at an estimated 15–20% annually, and it's straining regional grids in ways utilities didn't plan for a decade ago. Solar and wind can't be dispatched on demand the way a data center needs power, and new natural gas turbines have years-long order backlogs. Nuclear — unglamorous, capital-intensive, previously unfashionable nuclear — is the option left standing that can deliver enormous, constant, carbon-free power.

Who's actually signing checks

The deal that reset the conversation was Microsoft's, a $1.5 billion-plus commitment tied to restarting Pennsylvania's Three Mile Island plant in partnership with Constellation Energy, backed by a $1 billion federal loan from the U.S. Department of Energy. It's a symbolically loaded site — Three Mile Island is still the reference point most Americans have for nuclear accidents — and Microsoft's willingness to attach its name to restarting it signaled how serious the power crunch had become.

Others followed quickly. Meta signed a 20-year power purchase agreement with Constellation Energy. Google struck a corporate agreement with Kairos Power for up to 500 megawatts from advanced small modular reactors (SMRs) — smaller, factory-built reactor designs meant to be faster and cheaper to deploy than traditional gigawatt-scale plants. Amazon has committed roughly $500 million to nuclear technology development, extended its partnership with Talen Energy through 2042, and lined up separate SMR partnerships with Dominion Energy and Energy Northwest near its Virginia and Washington data center clusters. OpenAI has struck power agreements in Ohio alongside partners including Oracle, Blackstone, and Related Digital, and CEO Sam Altman personally chairs Oklo, a nuclear startup developing fast-neutron reactors that run on recycled nuclear waste fuel.

Data centers now draw more electricity annually than the entire state of Ohio — and AI-driven demand is growing 15 to 20 percent a year on top of that.

Small modular reactors: the technology doing the heavy lifting

Much of this new wave isn't about reviving old-style, decade-long megaprojects — it's about SMRs, factory-built reactors that can be shipped in modules and assembled faster than a traditional plant. The U.S. Department of Energy has backed this bet directly, awarding roughly $400 million each to the Tennessee Valley Authority and Holtec to advance SMR development. Even with that funding, most estimates still put SMRs a decade or more away from meaningfully supporting data center load at scale — which is part of why the older, already-built plants like Three Mile Island are getting first-mover attention now.

The uncomfortable timeline problem

The gap between when tech companies need the power and when new nuclear capacity actually comes online is the central tension of this whole trend. Restarting an existing plant, as Microsoft is doing, is measured in years. Building new SMR capacity is measured in a decade-plus. AI compute demand, by contrast, is compounding annually right now. That mismatch is why some of these deals look less like clean energy strategy and more like an insurance policy — tech companies locking in future capacity today because they've concluded the alternative is not having enough power at any price when they need it.

What to watch next

The next twelve months will show whether this becomes a genuine nuclear renaissance or a handful of headline-grabbing deals that don't scale. The signals to watch: whether the Tennessee Valley Authority and Holtec SMR projects hit their DOE-backed milestones on schedule, whether more hyperscalers follow Google and Amazon into direct SMR agreements rather than just power-purchase deals with existing plants, and whether public sentiment around nuclear — still shaped by Three Mile Island and Fukushima — shifts as the AI industry's fingerprints become more visible on the restart.