Carnot

Carnot is a UK engine manufacturing start-up based at a site in Milton Keynes, working to reduce the cost and emissions of heavy-duty power. It states it has developed the world's most efficient engines, using a wide range of low-emission fuels, and describes its team as coming from Aerospace, Formula 1 and Automotive engineering backgrounds. The company targets gigaton-scale CO2e reduction impact and aims to be the power solution of choice to decarbonise the hardest-to-abate sectors, collaborating with organisations worldwide.

Carnot is a UK engine manufacturing start-up based out of a site in Milton Keynes, reducing the cost and emissions of heavy-duty power. It states it has developed the world's most efficient engines, using a wide range of low-emission fuels, with a team drawn from Aerospace, Formula 1 and Automotive engineering backgrounds. The company targets gigaton-scale CO2e reduction impact and aims to be the power solution of choice to decarbonise the hardest-to-abate sectors, collaborating with organisations worldwide. Its timeline includes: in July 2023, £2.3m to deploy hydrogen engine sea trials; in February 2024, £5.3m grant funding, with Carnot winning three projects from the UK's Clean Maritime Demonstration Competition; in July 2023, Carisbrooke Shipping, a British shipping company, invested in Carnot; in August 2024, MOL (Mitsui O.S.K. Lines) became a major investor; in November 2025, Carnot was rewarded by the Sustainable Times as RISE Award Winners; in February 2026, Petredec partnered with Carnot to accelerate deployment of its next-gen engines using LPG fuels; in April 2026, Carnot's first engine test data was published at the SAE WCX event in Detroit; and in May 2026, Carnot significantly expanded its Bletchley, Milton Keynes facilities, tripling its operational footprint. In June 2026, Carnot announced it had been granted a United States Patent for its innovative engine technology, and in August 2026 it successfully tested its engine using biodiesel, the third fuel demonstrated on the same engine.

Decarbonising heavy-duty power with the world's most efficient engines

• High-efficiency multi-fuel engine

  Carnot Engines operate between 68–72% efficiency whilst using a range of decarbonised fuels including hydrogen, ammonia, methanol, biogas and HVO.

1. 1Carnot Engines - Future of sustainable powertrainscarnotengines.com
2. 2Who is Carnot Engines?carnotengines.com
3. 3Company updates Archives - Carnotcarnotengines.com
4. 4Carnotwikidata.org