That team is Lotus, an outfit which has fallen off its pace the past few seasons but which has still been a vital partner for Renault. That's because until a few seasons ago, the team based in Enstone, UK, was owned by Renault and bore the company's name. The operation was founded in 1981 as Toleman, was rechristened Benetton in 1986, bought by Renault 2000, taking the company's name in 2002, sold to its current owners Genii Capital 2009 and adopting the black and gold Lotus livery in 2011. As Benetton, it ran Ford engines until switching to Renault in 1995, sticking with the French outfit ever since, but that decades-long partnership – which meandered through Renault ownership and back out again – is now apparently drawing to a close.
The departure of Lotus as a customer team ought to allow Renault to focus instead on its increasing ties with Red Bull, which has taken the Enstone team's place as Renault's principal team. It could prove a smart move for the Lotus team as well, as the Mercedes engines have been outperforming the Renault units this season by an order of magnitude: not only is Mercedes far outpacing Red Bull at the top of the standings, but each of Mercedes' customer teams is performing better than Renault's clients.
The deal will also keep the list of clients at Mercedes AMG High Performance Powertrains (née Ilmor Engineering) on an even keel as McLaren similarly ditches its long-term partnership with Mercedes next season as it brings Honda back onto the grid. Though Marussia and Toro Rosso have yet to announce their engine suppliers for next season, the other teams are expected to stick with their current partnerships.