Geothermal Power

In areas like the volcanic “Big Island” of Hawaii, where there is abundant heat close to the surface of the Earth, and also an abundance of water, drilling can allow some of that water to be turned into steam and in turn, electrical power. The process is almost totally renewable, since the water (after being condensed from steam into liquid) is then returned to the ground. And while generating electricity this way is currently still more expensive than burning fossil fuels, increasing fuel costs may make it more competitive in the near future.

In addition, future improvements in technology may make it more feasible to utilize “dry” thermal energy, i.e. heat contained underground essentially everywhere on Earth.

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