Gentilly Nuclear Generating Station (Centrale nucléaire de Gentilly in French) is a former nuclear power station located on the south shore of the St. Lawrence River in Bécancour, Quebec, 100 km north east of Montreal.

[1][2] A third reactor, Gentilly-3, was scheduled to be built on the same site but was cancelled because of a drop in demand growth in the late 1970s.

[5] In August 2023, Hydro-Québec reported it was assessing the state of the plant to determine whether or not the Gentilly-2 CANDU reactor could be recommissioned.

Unlike the adjacent Gentilly-1 reactor, Gentilly-2 had a good service record since start-up in 1982, with a cumulative operating factor of 76.4%.

[9] Refurbishment of the reactor was eventually cancelled when on 3 October 2012, Hydro-Quebec's CEO, Thierry Vandal, announced the decommissioning of the Gentilly-2 generating station for economic reasons, scheduled to occur on 28 December 2012 at 10:30 p.m.[5][10] At that time, a decommissioning process will proceed over a period of 50 years and is expected to cost $1.8 billion.

[11] The permanent shut down and decommissioning of the power plant followed an election pledge from Quebec premier Pauline Marois.