U-Battery is a 'micro' nuclear reactor which will be able to produce local power and heat for a range of energy needs, mainly targeting the markets for industrial power units and off-grid locations. Powered by Triso fuel, each helium gas-cooled unit produces 10 MWt, can deliver up to 4MWe as electricity and can provide 750 degrees Celsius of process heat. Triso fuel comprises spherical particles of uranium fuel with a triple carbon-coating which effectively gives each tiny particle its own primary containment system.

The concept design of U-Battery was developed by the Universities of Manchester, the Dalton Institute (UK) and the Technology University of Delft (Netherlands) after the project was initiated in 2008 by Urenco. It is being developed by a consortium of Amec Foster Wheeler, Cammell-Laird, Laing O'Rourke and Urenco.

The consortium aims to have a demonstration reactor operating by 2025, and estimates that by the 4th-of-a-kind unit, U-Battery's capital costs will be between £40 and £70 million ($49 and $86 million).