Warren Estates and the adjoining Manzanita Estates, located in southwest Reno, Nevada, comprise the largest residential geothermal space heating district in Nevada. Nevada Geothermal Utility Company (NGUC), a privately owned utility, has operated the district since 1983 when it served only 10 homes. Today, the NGUC 130-acre service area includes approximately 160 residences; about 100 of those are currently under contract for geothermal space and water heating, and other related applications