Which SMR is closest to commercial operation?

The Linglong One (ACP100) in China is the closest SMR to commercial operation, with fuel loading imminent and grid connection expected in H1 2026. It will be the world's first land-based commercial SMR.

How many SMRs are currently operating?

Two small modular reactors are currently operating: China's HTR-PM (210 MWe high-temperature gas-cooled reactor at Shidao Bay, commercial since December 2023) and Russia's Akademik Lomonosov (70 MWe floating nuclear power plant at Pevek, operating since May 2020).

Which was the first Gen IV reactor to receive a US construction permit?

TerraPower's Natrium sodium-cooled fast reactor received its NRC construction permit in March 2026, making it the first Generation IV reactor to receive a construction permit in the United States. The 345 MWe plant will be built at Kemmerer, Wyoming.

How many SMR designs are under construction worldwide?

As of March 2026, five or more SMR projects have broken ground or are under active construction: GE Hitachi's BWRX-300 at Darlington (Canada), TerraPower's Natrium at Kemmerer (US), Kairos Power's Hermes at Oak Ridge (US), Oklo's Aurora at INL (US), and CNNC's Linglong One at Changjiang (China).

When will the first US SMR produce electricity?

Kairos Power's Hermes demonstration reactor at Oak Ridge, Tennessee is targeting first operation in 2027, though it is a non-power demo. The first US SMR to deliver commercial electricity will likely be GE Hitachi's BWRX-300 or TerraPower's Natrium, both targeting around 2029-2030.

RACE TO DEPLOY // SMR CONSTRUCTION TRACKER

25 reactor programs. 10 countries. One race to commercial nuclear power.

Operating

Under Construction

In Licensing

In Development

Concept/R&D

Pre-App

App Filed

Design Certified

Site Selected

CP Applied

CP Received

Ground Broken

Fuel Loaded

First Criticality

Grid Connected

Operating

THE FINISH LINE // DATA TABLE

#	Reactor	Developer	Type	MWe	Country	Milestone	Target	Status
1	Akademik Lomonosov	Rosatom/OKBM	PWR	70	🇷🇺 Russia	12/12	2020	OPERATING
2	HTR-PM	CNNC/Tsinghua	HTGR	210	🇨🇳 China	12/12	2023	OPERATING
3	Linglong One (ACP100)	CNNC	PWR	125	🇨🇳 China	9/12	H1 2026	UNDER CONSTRUCTION
4	Aalo-X (XMR)	Aalo Atomics	PWR	10	🇺🇸 USA	8/12	2026	UNDER CONSTRUCTION
5	Hermes	Kairos Power	FHR	demo	🇺🇸 United States	8/12	2027	UNDER CONSTRUCTION
6	Aurora	Oklo	SFR	15	🇺🇸 United States	8/12	2028	UNDER CONSTRUCTION
7	BWRX-300 (Darlington)	GE Hitachi / OPG	BWR	300	🇨🇦 Canada	8/12	2029	UNDER CONSTRUCTION
8	Natrium	TerraPower	SFR	345	🇺🇸 United States	7/12	2030	UNDER CONSTRUCTION
9	Xe-100	X-energy	HTGR	80	🇺🇸 United States	6/12	2030	IN LICENSING
10	SMR-300	Holtec International	PWR	300	🇺🇸 United States	6/12	2032	IN LICENSING
11	BWRX-300 (TVA)	GE Hitachi / TVA	BWR	300	🇺🇸 United States	6/12	2032	IN LICENSING
12	Rolls-Royce SMR	Rolls-Royce SMR Ltd	PWR	470	🇬🇧 United Kingdom	5/12	2035	IN LICENSING
13	VOYGR	NuScale Power	PWR	462	🇺🇸 United States	4/12	TBD	IN LICENSING
14	PWR-20	Last Energy	PWR	20	🇬🇧 United Kingdom	3/12	2028	IN LICENSING
15	IMSR	Terrestrial Energy	MSR	195	🇨🇦 Canada	3/12	2030s	IN LICENSING
16	ARC-100	ARC Clean Technology	SFR	100	🇨🇦 Canada	3/12	2030s	IN LICENSING
17	i-SMR	KHNP	PWR	170	🇰🇷 South Korea	3/12	2032	IN LICENSING
18	Kaleidos	Radiant Industries	Micro	1	🇺🇸 United States	2/12	2028	IN DEVELOPMENT
19	eVinci	Westinghouse	Micro	5	🇺🇸 United States	2/12	2029	IN DEVELOPMENT
20	KRONOS	NANO Nuclear Energy	Micro	1	🇺🇸 United States	2/12	2030	IN DEVELOPMENT
21	AP300	Westinghouse	PWR	300	🇺🇸 United States	2/12	2030s	IN DEVELOPMENT
22	SEALER	Blykalla	LFR	3	🇸🇪 Sweden	2/12	2030s	IN DEVELOPMENT
23	SSR-W	Moltex Energy	MSR	300	🇨🇦 Canada	2/12	2030s	IN DEVELOPMENT
24	ThorCon MSR	ThorCon International	MSR	500	🇮🇩 Indonesia	2/12	2030s	IN DEVELOPMENT
25	LFR-AS-200	Newcleo	LFR	200	🇫🇷 France	1/12	2030s	IN DEVELOPMENT
26	Copenhagen Atomics MSR	Copenhagen Atomics	MSR	100	🇩🇰 Denmark	1/12	2030s	IN DEVELOPMENT

The Global Race to Deploy Small Modular Reactors

RACE TO DEPLOY // SMR CONSTRUCTION TRACKER

THE FINISH LINE // DATA TABLE

FREQUENTLY ASKED QUESTIONS