ickering A - the first four of the Pickering reactors - went into service in 1971 and continued to operate safely until 1997 when it was placed in voluntary lay-up as part of what was then Ontario Hydro's nuclear improvement program. In September 2003, Unit four, was returned to commercial operation. Unit 1 was returned to commerical operation in November 2005. Units 2 and 3 remain in a safe shutdown state.
Pickering B - units five, six, seven and eight - continue to operate safely since they were brought into service in 1983. They have a combined capacity of approximately 2,100 megawatts. OPG has begun the Pickering B Refurbishment Study to determine the feasibility of refurbishing the units at Pickering B in order to extend their operating lives until 2050-2060.
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