Buemi, of the Renault E.dams team, finished ahead of Argentina's Jose Maria Lopez (DS Virgin Racing) and Germany's Nick Heidfeld (Mahindra) in a race fought out around the picturesque Esplanade des Invalides.
Di Grassi, the winner in the French capital last year, crashed into the barriers four laps from home and retired.
Results:
- Sebastien Buemi (SUI/Renault E.dams)
- 2. Jose Maria Lopez (ARG/DS Virgin) at 0.707
- Nick Heidfeld (GER/Mahindra) 2.043
- Felix Rosenqvist (SWE/Mahindra) 2.621
- Nicolas Prost (FRA/Renault E.dams) 3.521
- Robin Frijns (NED/Andretti) 7.999
- Nelson Piquet junior (BRA/Nextex) 32.420
- Tom Dillmann (FRA/Venturi) 32.929
- Mitch Evans (AUS/Jaguar) 33.369
- Stephane Sarrazin (FRA/Venturi) 34.051
World championship standings (after six rounds):
- Sebastien Buemi (SUI) 132pts
- Lucas di Grassi (BRA) 89
- Nicolas Prost (FRA) 58
- Nick Heidfeld (GER) 47
- Jean-Eric Vergne (FRA) 40