the.com/geothermal
Earth runs a furnace it never shuts off, so plug in.
means Energy harvested from the planet's internal heat, used to warm buildings or spin turbines into electricity.
from Greek ge (earth) plus thermos (hot), bolted together in the 1800s to name the planet's built-in radiator.
Core heatEarth's center rivals the sun's surface temperature.
Always onNo sun or wind needed; runs around the clock.
Iceland flexNearly all its heating comes from underground steam.