ON Power owns and operates the Nesjavellir and Hellisheiði Geothermal Plants. The plants provide electricity and hot water to industry and households in Iceland. 99% of housing in the Reykjavík area is space-heated with hot water provided by geothermal sources. Both plants are situated in the Hengill region; an active volcanic ridge in the south-west part of Iceland. ON also operates the Andakílsárvirkjun hydrostation, situated in Borgarfjörður.