KLT-40S (Akademik Lomonosov)
KLT-40S (Akademik Lomonosov) is a light water-cooled reactor design from Rosatom rated at 35 MWe. A unit of this design is generating power.
Two 35 MWe marine-derived reactors on a barge moored at Pevek in the Arctic, commercially operating since May 2020. The only SMR anywhere that has been selling power for years rather than promising to. It is also the awkward datapoint for the SMR cost thesis: it was expensive, late, and only economic because the alternative in Chukotka was diesel.
| Tier | |
|---|---|
| Regulator | Rostechnadzor (Russia) |
| Application type | no application |
| Docket / reference | Rostechnadzor operating licence, Akademik Lomonosov |
| Application date | - |
| Review phase | - |
| Decision expected | not stated |
| Coolant | Light water |
|---|---|
| Reactor family | Pressurised water reactor (PWR) |
| Electrical output | 35MWe |
| Thermal output | not disclosed |
| Fuel | Uranium dioxide |
| Enrichment | LEUUnder 20% U-235 |
| First site | Pevek, Chukotka |
| Offtakers | none announced |
Units announced with this design
2 units in the Global Nuclear Power Tracker carry the model name "KLT-40S 'Floating'", 2operating. Announcement is not permission; compare this against the regulatory position above.
| Unit | Country | Status | Gross MW |
|---|---|---|---|
| Akademik Lomonosov nuclear power plant 1 | Russia | operating | 35 |
| Akademik Lomonosov nuclear power plant 2 | Russia | operating | 35 |
Sources
- World Nuclear Association and IAEA ARIS · retrieved 2026-09-06
- Announced units: Global Nuclear Power Tracker, Global Energy Monitor, August 2026 release , CC BY 4.0
How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data