The facility is located adjacent to Hell's Gate National Park, along with its sister stations, Olkaria I, Olkaria II, and Olkaria IV. This location lies in the Olkaria area, in Nakuru County, on the eastern edge of the Eastern Rift Valley, approximately , by road, southwest of Naivasha, the nearest large town. Olkaria lies approximately , by road, northwest of Nairobi. The geographical coordinates of Olkaria III Geothermal Power Station are 0°53'27.0S, 36°17'21.0E (Latitude:-0.890833; Longitude:36.289167).