London: Former champions Williams will switch from Renault to Mercedes engines next season when a new V6 unit is introduced, the Formula One team said on Thursday.
The decision means Mercedes engines will power four of the 11 teams in 2014 before McLaren enter a new partnership with Honda from 2015.
Mercedes also supply their own works team, winners in Monaco last weekend, and Force India.
Renault will have at least three teams next season, with Red Bull and Toro Rosso already signed up and Caterham also committed to the French manufacturer.
Formula One is ditching the current 2.4 litre V8 engine at the end of this season in one of the biggest shake-ups of the rules in decades. From 2014, cars will be powered by a 1.6 litre V6 with turbocharger and energy recovery systems.