The hydropower generated by the mighty Niagara Falls is the real authority behind the New York Power Authority (NYPA). The company generates and transmits more than 20% of New York's electricity, making it the largest state-owned public power provider in the US. It is also New York's only statewide electricity supplier. NYPA owns hydroelectric and fossil-fueled generating facilities (17 in total) that produce about 5,700 MW of electricity, and it operates more than 1,400 circuit-miles of transmission lines.