Renault V6 hybrid Formula One power unit
The Renault E-Tech R.E. Series was a 1.6-liter, hybrid turbocharged V6 racing engine developed and produced by Renault Sport F1 in partnership with Mecachrome for the FIA Formula One World Championship. Initially conceived for the regulation changes of, Renault's hybrid power units feature electric motors specialised for recovery of kinetic energy, titled the MGU-K, and one for recovery of heat energy, titled the MGU-H.
The turbo-hybrid engines served as a replacement for the outgoing Renault RS27 naturally-aspirated V8 engine, which had been in use since. The engine was first unveiled on 21 June 2013, during the 2013 Paris Air Show
At launch, Renault engines were utilised by Red Bull, Red Bull's sister team Scuderia Toro Rosso, Lotus, and Caterham. However, the engines suffered a reliability and performance deficit against their competitors' faster power units, leading to a public breakdown of trust between Red Bull and Renault; from to, Red Bull's power units were badged with the name of the watch company TAG Heuer. McLaren began to use Renault power units in 2018 and switched to [Mercedes V6 engine|V6 hybrid Formula One power unit|Mercedes] units in, leaving Team Enstone's then-new brand of Alpine as Renault's sole works supplier. Due to the continued deficits against other power units, as proven by Alpine's poor performance and reliability, Renault officially announced that they would be pulling out of Formula One engine developments after the season - ahead of the 2026 regulation changes - with their historic Viry-Châtillon factory being repurposed as an engineering centre for Alpine and Renault cars.