Williams have confirmed that Mercedes will supply their engines from 2014 onwards

Williams have confirmed their deal with Mercedes-Benz that will see the German manufacturer supply engines from the 2014 season onwards.

The backdrop for the rule change is an attempt to improve the efficiency of F1 cars. They will have to complete races with a fuel load of just 100kg - the current figure is around 150kg - with additional power coming from an Energy Recovery System (ERS). The ERS is expected to provide ten times more power than the KERS systems F1 cars currently use. Besides KERS, the new system will also recovery energy via the exhaust turbine. Andy Cowell, Managing Director of Mercedes AMG HPP, said: "Williams is one of the sport's iconic names and we are very excited to be working together towards a successful future under the new regulations. "A further positive is that this new agreement provides Mercedes-Benz with the long-term stability of supplying our works team and at least two partners from the 2015 season onwards, following the conclusion of our relationship with McLaren at the end of next season." With Force India also running Mercedes power in 2014, the deal means that they will supply four teams in all, although McLaren switch to Honda the following year. Mercedes' Executive Director Toto Wolff, who held a similar position at Williams until the start of this year, added: "It is a win-win situation for both HPP and Williams, which will ensure HPP is able to supply at least three teams on a long-term basis under the new regulations and could open interesting new perspectives for technology transfer. "We look forward to enjoying much success together over the coming years." For their part, Renault Sport F1 President Jean-Michel Jalinier said: "We would like to thank Williams for the warmth it has extended to Renault over the last two years and wish the team the very best for the future. "We will continue to actively work with the team until the Brazilian Grand Prix in November to end the second incarnation of the partnership with results that do justice to its reputation." Renault has 2014 deals confirmed with Red Bull and Toro Rosso, although Caterham and Lotus are both expected to renew their agreements soon. In a statement released on Thursday, the French manufacturer said that it 'would supply up to five teams if there was a requirement to do so, but this would not make sense economically or be ideal for our resources. 'Three, or up to four, teams is the ideal for us so the departure of Williams normalizes the situation and makes things much clearer from our side. 'We will announce the next team within a matter of days, and then confirm the final stage before the end of June. We remain incredibly motivated about the challenge of the 2014 engines.'