Editing CANDU reactor (section)

===600 MW<sub>e</sub> designs ===
The successes at NPD and Douglas Point led to the decision to construct the first multi-unit station in Pickering, Ontario.  Pickering A, consisting of Units 1 to 4, went into service in 1971.  Pickering B with units 5 to 8 came online in 1983, giving a full-station capacity of 4,120&nbsp;MW<sub>e</sub>.  The station is very close to the city of [[Toronto]], in order to reduce [[electric power transmission|transmission]] costs.

A series of improvements to the basic Pickering design led to the CANDU&nbsp;6 design, which first went into operation in the early 1980s. CANDU&nbsp;6 was essentially a version of the Pickering power plant that was redesigned to be able to be built in single-reactor units. CANDU&nbsp;6 was used in several installations outside Ontario, including the [[Gentilly Nuclear Generating Station|Gentilly-2]] in Quebec, and [[Point Lepreau Nuclear Generating Station]] in New Brunswick. CANDU&nbsp;6 forms the majority of foreign CANDU systems, including the designs exported to Argentina, Romania, China and South Korea. Only India operates a CANDU system that is not based on the CANDU&nbsp;6 design.