The flywheel energy-storage technology that was used in, among other things, the Le Mans-winning Audi R18 e-tron quattro is being sold by Williams to GKN Land Systems for use mainly in mass-transit vehicles. Williams initially developed the technology for its 2009 Formula One car but has since switched focus to the automotive and mass-transit sectors including buses and trams. Williams claims the technology can improve fuel economy and reduce emissions by about 30% by capturing some of the energy otherwise lost as heat in braking. The deal involved two units of the Williams group. Mike O'Driscoll, group CEO, said: "The Williams Hybrid Power business has been developed very successfully over the last few years, and is now at the point of broader market commercialization." ​GKN Land Systems designs, manufactures, and supplies products and services for the agritechnical, construction, mining and utility vehicle markets.