The 32-year-old Brit has been involved with Formula E since its inception in 2014, first as a test and reserve driver before securing a race seat for season five with BMW i Andretti Motorsport.
Sims secured a maiden Julius Baer Pole Position in year one with the German marque in New York City, with his season six highlight undoubtedly that opening weekend in Diriyah - with a pole position double and a maiden Formula E win in Round 2 of the Saudi double-header.
“I’m delighted to be joining Mahindra Racing and continuing my Formula E journey," said Sims. "It is an exciting opportunity to bring on the team’s package and challenge for strong results.
"Promoting sustainability and electric mobility is important to me personally and competing in Formula E provides a strong, innovative and forward-looking platform to raise awareness. I want to thank BMW i Andretti Motorsport for all its support during the past two seasons and wish the team well for the future.
"It’s been a huge learning curve coming into Formula E. It’s such a different discipline in motorsport and brings with it great new challenges. I’m excited to continue developing and to use my knowledge to support Mahindra Racing in the upcoming season.”
CEO and team principal Dilbagh Gill feels he's secured a proven talent, a team player and someone who marries with Mahindra Racing's ethos perfectly.
“I’m thrilled on behalf of the whole team to welcome Alexander. I’m extremely excited about working with him and the prospect of what we can achieve together is motivating," said Gill.
"In Alexander we have a proven racing talent plus someone that embodies what Mahindra Racing stands for with his personal principles in the areas of electrification and sustainability. He is an intellectual driver, a very nice guy and a team player."
Gill also announced that Jerome D'Ambrosio would be leaving the outfit after two years, a race victory back in Marrakesh in season five and a podium on his debut for the team.
"I would like to pay tribute to Jerome, who leaves us after two years with the team. We have had some great moments together and I wish him all the very best as he moves on to new endeavours. He is a class act and I look forward to seeing what he does next.”
"I’m enthused about what season seven will bring and look forward to announcing Alexander’s team-mate in due course."