Electricity is provided to Paris through a peripheral grid fed by multiple sources. , around 50% of electricity generated in the Île-de-France comes from cogeneration energy plants located near the outer limits of the region; other energy sources include the Nogent Nuclear Power Plant (35%), trash incineration (9% – with cogeneration plants, these provide the city in heat as well), methane gas (5%), hydraulics (1%), solar power (0.1%) and a negligible amount of wind power (0.034 GWh). A quarter of the city's district heating is to come from a plant in Saint-Ouen-sur-Seine, burning a 50/50-mix of coal and 140,000 tonnes of wood pellets from the United States per year.