Stephen Francis Lindsey

Lontra Ltd. develops energy savings compressors and engines. It offers blade compressor, a rotary device with a wrapped toroidal chamber, and a compact and double acting rotary compressor for various industrial air markets, blowers, and specific process gas applications; and Blade supercharger, a displacement supercharger for heavily downsized gasoline and diesel powertrains. The company was founded by Stephen Francis Lindsey and Simon Hombersley in 2004 and is headquartered in Napton, the United Kingdom.

TwentyNinety was founded in 2004 to develop innovative enabling technologies for the renewable energy generation industry. Active Array™ is the company's first technology. It was developed to provide valuable Photovoltaic management and control information to a fast growing industry with very little enabling infrastructure, and to respond to basic performance limitations inherent in the design of a Photovoltaic array. Active Array™ was patented in 2006, and the company was successful in raising investment to commercialize the technology in 2008.