It will be built by OptiSolar Farms Canada Inc., a subsidiary of Hayward, Calif.-based OptiSolar Inc.

"This is an exciting development in Ontario's quest for cleaner power and in our efforts to minimize our ecological footprint," Ontario Energy Minister Dwight Duncan told a news conference.

Duncan added the next largest photovoltaic project in North America was announced earlier this week. It is a 15-megawatt solar system to be built at an air force base in Nevada.

"Solar electricity is just about everything we could want in an energy source," said Peter Carrie, vice-president of OptiSolar Farms Canada Inc.

"It's clean, you can tap into it wherever and whenever the sun shines. It's quiet, sustainable and Earth-friendly."

Currie would not disclose how much it will cost to build the project, but said typically a project in a 10 megawatt range would cost up to C$80 million.

The solar farm will stretch across nearly 365 hectares, and about one million panels will be erected as high as 7 meters off the ground. Currie said the company plans to begin building the solar farm in spring 2008.

Ontario pays solar power generators 42 Canadian cents a kilowatt-hour for electricity, a key reason OptiSolar chose to build its project in the province.

The Ontario Power Authority has agreed to purchase the electricity under a 20-year contract that will see the power go into the provincial grid.

The solar farm project is part of 14 new, renewable energy projects awarded through Ontario's Standard Offer Program, which sets a fixed price for small renewable energy projects.

The program is expected to add up to 1,000 megawatts of renewable energy to Ontario's electricity supply over the next 10 years.