Kinetic Energy Recovery Systems (KERS) have been introduced into Formula One as part of the sport's major regulation change for 2009.
A means to recover energy created under braking, the new regulation will see all teams running either a battery or flywheel system this season in an effort to improve racing. With the potential for the systems to be filtered into other applications, KERS is also one of the sport's major green initiatives.
Williams is the only team on the grid to be using a flywheel system which is demonstrated in this film, together with the team's Chief Designer, Ed Wood and CEO of Williams Hybrid Power, Ian Foley.
Thanks to AT&T Williams for the use of this and other AT&T Williams videos.