High Quality Content by WIKIPEDIA articles! Ontario Power Generation (OPG) is a public company wholly owned by Government of Ontario. OPG is responsible for approximately 60% of the electricity generation in the Province of Ontario, Canada. Sources of electricity include nuclear, hydroelectric, wind, solar and fossil fuel. Although Ontario has an open electricity market, the provincial government, as OPG`s sole shareholder, regulated the price the company receives for its electricity to be less than the market average, in an attempt to stabilize prices. As of 1 April 2008, the company`s rates have been regulated by the Ontario Energy Board.