The largest share of Kenya's electricity supply comes from geothermal energy, followed by hydroelectric stations at dams along the upper Tana River, as well as the Turkwel Gorge Dam in the west. A petroleum-fired plant on the coast, geothermal facilities at Olkaria (near Nairobi), and electricity imported from Uganda make up the rest of the supply. A 2,000 MW powerline from Ethiopia is nearing completion.