The Jean-Lesage hydroelectric plant or Manic-2, is a run of the river hydroelectric power plant located 22 km from Baie-Comeau built on Manicouagan River in Quebec, Canada. It was constructed between 1961 and 1967. On June 22, 2010, the dam and the generating station were renamed to honor former Quebec premier Jean Lesage, who was premier of Quebec during the construction of the complex.

Jean-Lesage is a gravity dam "hollow type" with a spillway made of concrete. The reservoir starts at the base of Manic-3. The dam is considered run-of-the-river and is fitted with eight Francis turbines, with a total capacity of 1145 megawatts.

Construction of Jean-Lesage hydroelectric plant started on October 24 1961. From June 2 to December 8 1962, diversion tunnels were driven through the mountain to divert the river's flow around the construction site. The cofferdam that forced the to water use the diversion tunnels was completed on July 30 1963, construction of the dam started the day after. By autumn 1965, the dam and powerhouse were sufficiently complete to put the first group of five turbines into service, the others were put in service at the end of construction. Commissioning was completed in 1967.

It is possible to visit the complex during summer between the end of June and start of September. The 90 minutes visit consists of a guided tour by Hydro-Quebec which lets the visitor enter cavities of the dam and see a turbine in action within the powerhouse.
Jean-Lesage generating station
Locale Quebec, Canada
Construction began 1961
Opening date 1967
Dam and spillways
Height 94 m
Length 692 m
Impounds Manicouagan River
Creates Reservoir Manic-2
Capacity 4 000 Mm³
Surface area 124 km²
Power station
Owner(s) HydroQuebec
Turbines 8 x Francis-type
Installed capacity 1,145 MW