Steam billows from the Hudson Ranch geothermal plant in Calipatria, near the Salton Sea. While the plant serves the Phoenix metro area, operator EnergySource LLC is considering building more geothermal plants to serve San Diego.

Steam billows from the Hudson Ranch geothermal plant in Calipatria, near the Salton Sea. While the plant serves the Phoenix metro area, operator EnergySource LLC is considering building more geothermal plants to serve San Diego.

With the San Onofre Nuclear Generating Station down for repairs and no restart date, utility San Diego Gas & Electric Co...

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