The Ontario Energy Board has approved Hydro One's application to build a C$635 million, 180-kilometre high-voltage transmission line designed to bring another 3000 MW of wind and nuclear power from the Bruce area on Lake Huron to load centres in southern Ontario. The board's consent is conditional upon the project receiving Ontario Environmental Assessment Act approval. The Ontario Power Authority, which handles planning for the province's electricity system, has declared a large area in the Bruce region off limits to new generation until the new line is in place. The area has some of Ontario's best wind resources. Hydro One, in its application, forecast the need to provide transmission capacity to 1700 MW of wind generation by 2015. The new line represents the largest expansion to Ontario's transmission system in 20 years and is expected to go into service in December 2011.