Is all Power in Iceland Geothermal?

No.

Iceland uses a number of energy sources. The electrical power is all generated from renewable energy sources. Approximately 10 to 15% of electricity is generated by geothermal wells. The remainder by hydroelectric dams.

Icelandic homes and businesses consume less than 10% of electric power, with the remainder going to high power consumption industries like aluminum smelters.

Iceland does use petroleum based fuels for its automobiles, but is researching methods to replace this use through both electric and hydrogen fueled vehicles.

Geothermal wells also provide water for zone heating and domestic hot water. The spent zone heating water is in turn used to warm swimming pools and even a beach in Reykjavik harbor.