Story highlights Jean Eric-Vergne wins Bern E-Prix

Extends title lead to 32 points

(CNN) In a four-way last lap tussle, it was Jean Eric-Vergne who kept his nerve to win the Bern E-Prix Saturday to boost his hopes of become Formula E's first back-to-back world champion.

The Swiss capital was staging its first Formula E race, marked by a first-lap pile up then a thrilling climax as a late rain shower made the 2.75km, 14-turn circuit treacherous.

Vergne, from pole, had led throughout, but was coming under constant pressure from New Zealand's Mitch Evans (Jaguar Racing), with home hope Sebastien Buemi (Nissan e.dams) and his DS Techeetah teammate Andre Lotterer taking close order.

With the Frenchman driving cautiously to ensure he made no late mistakes, it left Evans and the other chasers with a chance of victory, Vergne holding them off as all four finished nose to tail.

In a dramatic twist, Lotterer was later given a 22-second penalty, dropping him to 14th, for ignoring a pit exit light, wrecking his championship chances.