The La Grande-3 Power Station or LG-3 is a hydroelectric dam on the La Grande River in northern Quebec, part of Hydro-Québec's James Bay Project. The La Grande-3 Power Station can generate 2,418 MW and was commissioned in 1982-1984. It generates electricity through the reservoir and dam system. The dam and reservoir both are named La Grande-3.

La Grande-3 Generating Station
Official name La Grande-3
Locale Quebec, Canada
Coordinates 53°43′47″N 75°58′06″W / 53.72972°N 75.96833°W / 53.72972; -75.96833 / 53.72972; -75.96833
Opening date 1984
Owner(s) Hydro-Québec
Dam and spillways
Impounds La Grande River
Spillway capacity 10,000 m3/s (350,000 cu ft/s)
Creates La Grande-3 Reservoir
Surface area 2,420 km (1,504 mi)
Hydraulic head 79.2 m (260 ft)
Power station
Turbines 12 × 201.5 MW (Francis turbine)
Installed capacity 2,418 MW