Sunamp’s thermal batteries deliver hot water, cooling and heating for homes and businesses, and can be charged with renewable energy. The patented technology is compact, cuts energy costs, and reduces reliance on fossil fuels. Chief executive Andrew Bissell founded the East Lothian firm in 2006. In September 2021, the company secured £6m of funding from the Scottish National Investment Bank to drive expansion in China, the Americas and Europe. In November, it signed a £50m deal to roll out its thermal storage products in China.