Ontario's rivers make it rich in hydroelectric energy. In 2009, Ontario Power Generation generated 70 percent of the province's electricity, of which 51 percent is nuclear, 39% is hydroelectric and 10% is fossil-fuel derived. By 2025, nuclear power is projected to supply 42%, while fossil-fuel-derived generation is projected to decrease slightly over the next 20 years. Much of the newer power generation coming online in the last few years is natural gas or combined-cycle natural gas plants. OPG is not, however, responsible for the transmission of power, which is under the control of Hydro One.