Williams has been in partnership with Mercedes-Benz since the start of the 2014 season. The team will continue to be supplied with Mercedes-Benz Power Units (Internal Combustion Engine plus Energy Recovery System) by Mercedes-AMG High Performance Powertrains (HPP) based in Brixworth, UK for a further five years from 2021, following the conclusion of the original agreement. Williams will continue to manufacture its own transmission.
The 2014 regulations saw teams switch from naturally aspirated 2.4 litre V8 engines to 1.6 litre V6 turbocharged hybrid Power Units, and Williams has enjoyed a successful partnership with Mercedes-Benz since this time, achieving some of its best results in recent years finishing third in both the 2014 and 2015 seasons.