Small Module Nuclear Reactors
The commitments Microsoft made - “we’ll pay our way,” “we won’t raise your electricity bills,” “we’ll add our own generation” - quietly acknowledge the real bottleneck in the AI boom: the grid cannot supply the power these data centers need without shifting costs onto ordinary ratepayers. That’s the political red line the administration is drawing.
What’s missing from the public conversation is that the current U.S. small‑modular‑reactor landscape is nowhere near ready to meet this demand at scale. NuScale is the only design with full NRC approval, but its flagship project collapsed under cost pressure. Oklo is still pre‑license. NANO Nuclear is early‑stage. Most of the “SMR boom” is still PowerPoint‑deep.
The one exception - and the one that actually aligns with what Microsoft is now promising - is the IMSR from Terrestrial Energy.
IMSR is the only advanced reactor with a DOE Other Transaction Authority agreement under the new Advanced Reactor Pilot Program. That matters because it gives IMSR a federally supported path to a real, operating pilot - not just a design certification. It also means the technology is being evaluated specifically for industrial‑scale, colocated power: the exact use case data centers now require.
And unlike large nuclear or water‑cooled SMRs, IMSR’s molten‑salt design doesn’t need massive cooling water withdrawals, doesn’t require new transmission corridors, and can be sited directly adjacent to load. That’s the only way for SMR to meet the political requirement that tech companies “pay their own way” without pushing costs onto local communities.
If the U.S. is serious about powering AI without raising household electricity bills, the solution isn’t more promises - it’s a deployable, modular, privately financeable reactor that can sit next to a data center and run 24/7. Right now, IMSR is the closest thing the industry has to that.