South America:

An Open Frontier: The Untapped Potential of South American Geothermal (Renewable Energy World.com)

South America holds great potential for geothermal energy, but barriers to development leaves it largely underdeveloped. However some private investors and development banks are on the cusp of unlocking the abundant energy source.

The ring of fire is a geologic region that extends in a horseshoe shape from the bottom tip of South America, up along the Pacific coast through North America, and looping back through Asia and down to New Zealand. It's lined with more than 400 volcanoes, and as the Johnny Cash song goes, it "burns, burns, burns," which also means it's a geothermal dream zone.

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