Manchester-based ENER-G has been named 3i Private Business of the Year at the National Business Awards.
The company, founded in 1997, designs, manufactures, finances and delivers renewable and energy-efficient technologies.
Last year, it turned over £130m, up from £97m the year before, with export sales accounting for 47% of its business.
Over 150 businesses were competing for the prize this year, an increase of over 40% from the year before.
Judge Gordon Hague, director of 3i, said: “Leading in an exciting global growth market and demonstrating a commitment to developing talent in the UK, ENER-G is a champion of British engineering and innovation that even funds new projects.”
ENER-G managing director Derek Duffill said winning the award was “the stuff of dreams”. He added: “Yet our achievements in the real world are very much a product of hard graft, unrelenting innovation and a keen eye for opportunity.”
Company founder and chairman Tim Scott added: “ENER-G has generated powerful growth recently, but we have never lost sight of our entrepreneurial roots. As a result, we are a very agile business, able to take decisive action to win and retain business.”