Salt River Project management has proposed dramatic changes to its residential electricity rates that carry significant impacts for its more than 12,000 rooftop solar customers.
Renewable Energy: An Overview - Geothermal
Geothermal energy is a renewable resource; about 95 percent of the hot water in geothermal reservoirs began as cool rainwater. When rainwater seeps through cracks in the Earth's crust, it is heated by magma and turns to steam. The steam rises to the atmosphere, cools, turns back to liquid, falls back to earth as rain and eventually seeps back through cracks to be turned back into steam.
Arizona has an abundance of low-temperature geothermal areas, or hot springs, in the southeastern part of the state. Although the majority of these areas are not suitable for generating electricity, they do have potential for heating and cooling greenhouses, nurseries and fish farms.
The two highest temperature springs in the state are Clifton and Gillard, both in the Clifton-Morenci area of southeastern Arizona. The water temperature at these springs ranges from 158-180 degrees Fahrenheit. Even though temperatures may exceed 284 degrees Fahrenheit at depth, these two sites are only suitable for low grad steam. Neither of these areas has been developed.
More on geothermal energy here.