Williams intends to buy more of the company that has developed its flywheel KERS system.
It emerged on Thursday that, following FOTA's 2010 KERS ban, the energy recovery unit will instead be fitted to Porsche's new 911 GT3 R Hybrid road car, and raced by the marque at the Nurburgring.
Williams, already developing the system for Tata Motors' Jaguar Land Rover, said the technology will also be available to buses, trains, ships and wind power generation.
The Grove based team bought a 40 per cent share in the British company Automotive Hybrid Power in 2008, relocating it to the team's factory and renaming it Williams Hybrid Power.
Team chief executive Adam Parr told the financial news service Bloomberg that Williams is now buying a majority stake in the company.
"We are very hopeful it will turn into a great business," he said, adding that it could provide "a significant contribution" to the F1 team's budget.