"We were impressed when he drove for us in the first practice sessions in Abu Dhabi and Brazil. We are confident that drafting him in to one of our driver's seats will help us in our rebuilding process.”
Grosjean's deal means there is no room at Lotus Renault for either of the team's 2011 drivers, Petrov and Bruno Senna (who replaced original Kubica stand-in Nick Heidfeld).
The announcement comes despite Petrov having a deal in place for the 2012 season.
“I would like to thank Vitaly Petrov and Bruno Senna for their contribution to the team's performance this year and I wish them all the best for the future,” said Boullier.
Genii Capital chairman Gérard Lopez said there is now a 'real buzz' around the team, which finished fifth in the 2011 Constructors' Championship.
“Only last week I reiterated that the team is at the start of a brand new cycle. Announcing Romain as our race driver alongside Kimi is great news and will help us achieve our aims of getting back to the very top. The announcements we made today and last week are exciting ones for our team and there is a real buzz surrounding us now.”
Upon announcing Grosjean, Lotus Renault also confirmed an extension of its sponsorship deal with Total for another season.
"Total is delighted to give the young talented French driver, Romain Grosjean, the opportunity to fulfill his dream by becoming an F1 driver with the Lotus Renault GP team," said Jacques-Emmanuel Saulnier, senior vice-president of corporate communications at Total.