Starting from pole, former F1 racer Buemi timed his race to perfection, finishing ahead of Brazil’s Lucas di Grassi for his second win of the season.
The podium was completed by another Formula Onerefugee Nelson Piquet Jr who came home in third spot.
Virgin Racing’s Sam Bird was fourth ahaead of Jerome D’Ambrosio and Nico Prost completing the top six.
“To win in Monaco is a great feeling,” said Buemi. “I knew about this thing of everyone starting on pole and not winning the race, so it was good in the end to finally manage that, especially here as we could see it’s very difficult to overtake.”
In the drivers’ standings, di Grassi has stretched his lead over Piquet to four points, while Buemi has moved up to third a further six points back.
Results in Saturday’s Monaco FormulaE, the seventh in the 11-race championship:
1. Sebastien Buemi (SUI/e.dams Renault), 2. Lucas di Grassi (BRA/Audi Sport Abt), 3. Nelson Piquet Jr (BRA/Nextev TCR), 4. Sam Bird (GBR/Virgin Racing), 5. Jérôme d’Ambrosio (BEL/Dragon Racing), 6. Nicolas Prost (FRA/e.dams-Renault), 7. Stéphane Sarrazin (FRA/Venturi GP), 8. Scott Speed (USA/Andretti), 9. Charles Pic (FRA/Nextev TCR), 10. Félix da Costa (PRT/Amlin Aguri)
1. Lucas di Grassi (BRA) 93 pts, 2. Nelson Piquet Junior (BRA) 89, 3. Sébastien Buemi (SUI) 83, 4. Nicolas Prost (FRA) 77, 5. Sam Bird (GBR) 64
1. e.dams-Renault 160 points, 2. Audi Sport ABT 115, 3. Virgin Racing 94, 4. Nextev TCR 93, 5. Andretti 82
Remaing races: May 23 Berlin; June 6 Moscow; June 27 and 28 London (2 races)
– Agence France-Presse