How to read a nuclear announcement
There are 328 announced nuclear units in the global tracking data and 85 under construction. The gap between those numbers is where most nuclear journalism lives.
Some checks that separate a project from an intention.
1. Ask what a regulator has actually done
“Approved” is doing a lot of work in most coverage. It can mean any of:
- a design is certified, with no unit permitted anywhere
- a construction permit has been issued for a specific unit at a specific site
- a topical report on methodology has been accepted, ahead of an application not yet filed
- a vendor design review has concluded, which is explicitly not a licensing decision
- a Department of Energy authorisation for an experiment on a national laboratory site, which is not commercial licensing at all
NuScale holds the only certified SMR design in the United States and has no permitted unit anywhere; its flagship customer project was cancelled in 2023 on cost. That is what “approved” bought.
2. Count announced units against regulatory position
In the fleet data, NuScale has 61 announced units. Aalo-1 has twelve, on a DOE pathway that is not commercial licensing. BWRX-300 has 47 and is genuinely under construction at Darlington.
Announced-unit counts measure promotion. Put them next to the docket.
3. Ask where the fuel comes from
Two thirds of advanced designs need HALEU. Western production is a few hundred kilograms a year and the plants meant to fix that are dated 2028 to 2031. If a developer promises power in 2029 and needs HALEU, one of those two dates is wrong.
4. Check the date on the status, not the report
This one caught us. The August 2026 release of the base fleet dataset we use lists 93% of operating units as last researched in May 2024. Three Belgian reactors that have shut down still read as operating in it.
A dataset’s publication date is not its data’s freshness date. Every reactor page here shows the date that specific unit was last researched, and where we have corrected a record the change, its source and its verification date are shown on the page.
5. Watch for “inferred”
281 units in the fleet data carry a status the compiler inferred from an absence of progress rather than from an announcement — a project nobody has formally cancelled but nobody has advanced for four years. Those are flagged as inferred throughout this site. An inferred cancellation is much weaker evidence than an announced one, and an inferred anything should never be quoted as fact.
The SMR tracker applies all of this: every design is tiered by regulator action, with its docket next to it.