Editing CANDU reactor (section)

===900 MW<sub>e</sub> designs===
The [[economics of nuclear power plants]] generally scale well with size. This improvement at larger sizes is offset by the sudden appearance of large quantities of power on the grid, which leads to a lowering of electricity prices through supply and demand effects. Predictions in the late 1960s suggested that growth in electricity demand would overwhelm these downward pricing pressures, leading most designers to introduce plants in the 1000&nbsp;MW<sub>e</sub> range.

Pickering&nbsp;A was quickly followed by such an upscaling effort for the [[Bruce Nuclear Generating Station]], constructed in stages between 1970 and 1987. It is the largest nuclear facility in North America and second largest in the world (after [[Kashiwazaki-Kariwa Nuclear Power Plant|Kashiwazaki-Kariwa]] in Japan), with eight [[nuclear reactor|reactors]] at around 800&nbsp;MW<sub>e</sub> each, in total 6,232&nbsp;MW (net) and 7,276&nbsp;MW (gross).  Another, smaller, upscaling led to the [[Darlington Nuclear Generating Station]] design, similar to the Bruce plant, but delivering about 880&nbsp;MW<sub>e</sub> per reactor in a four-reactor station.

As was the case for the development of the Pickering design into the CANDU&nbsp;6, the Bruce design was also developed into the similar CANDU&nbsp;9.<ref>[http://www.iasmirt.org/SMiRT15/S01-4 "CANDU 9 Evolution and Future Heavy Water Reactors"] {{Webarchive|url=https://web.archive.org/web/20111008232452/http://www.iasmirt.org/SMiRT15/S01-4 |date=8 October 2011 }}, AECL, 15–20 August 1999.</ref> Like the CANDU&nbsp;6, the CANDU&nbsp;9 is essentially a repackaging of the Bruce design, so that it can be built as a single-reactor unit. No CANDU&nbsp;9 reactors have been built.