Methodology

Where the data comes from

Licensing facts come from the regulator first: NRC project pages and dockets, CNSC, ONR, France’s ASNR, STUK, NSSC and Rostekhnadzor, plus DOE announcements for test reactors. Design, output and deal facts come from the company’s own releases, SEC and exchange filings and utility announcements, then named trade press (World Nuclear News, ANS Nuclear Newswire, NucNet, POWER, Data Center Dynamics). Every record lists its sources with the date we accessed them, and every value in the table links to the source it came from.

How we verify

Each row shows the date we last checked it. A field is filled only when a source states it; when a company does not publish a figure, the cell stays empty. MWe is per reactor module, as the company or regulator states it; plant totals sit in the text. The licensing stage is the furthest formal milestone with any regulator, and its date is the day that milestone happened. First-power years are the company’s or host utility’s stated target. A data-center deal means a signed or announced agreement with a named hyperscaler or data-center operator; a stated interest in the market does not count. A company enters the table only with at least three sourced fields beyond name, URL and summary.

Which companies qualify

We include companies developing their own reactor designs, including microreactors, heat reactors and advanced designs above the usual SMR size threshold. Each needs at least three sourced technical or commercial fields beyond name, URL and summary. Project developers that procure other companies’ designs are outside this table: Kärnfull Next, Elementl Power, The Nuclear Company and Blue Energy. Their projects can still appear in a reactor designer’s deal notes.

Studsvik describes Kärnfull Next as a site and project developer; Elementl describes technology-agnostic selection; The Nuclear Company describes delivery of Westinghouse technology. All accessed 11 November 2026.

Conflicting specifications and targets

The current product specification takes precedence over older promotional material. Holtec’s product page and the NRC state approximately 340 MWe per SMR-300, while its FAQ still states 320 MWe. We use the current net specification. Natura’s end-of-2026 operation target refers to its non-power MSR-1 demonstration, distinct from its 100 MWe commercial design. An unreported grid-connection date remains empty, as for Linglong One. The source notes retain these distinctions.

Corrections

Vendors and readers can send corrections to hello@smrcompanies.com with a public source. We update the row and its verified date. Featured placement is paid and labelled; it never changes a row’s data or its position in the sorted table.

Reuse

The dataset is free to reuse under CC BY 4.0 with a link to smrcompanies.com. Download it as CSV or JSON.