The maps (and explanations) on this page have been provided by the Southern Methodist University's Geothermal Laboratory. This web site has additional geothermal maps.
A temperature of 250°F is used as a baseline for a well or field to be considered for geothermal extraction to generate electricity in Texas and the Gulf Coast. This Texas map of temperatures at 250°F is used to determine where to look for wells for geothermal electrical production. The map shows how deep (on average) drilling needs to be in an area to reach that temperature. For example, in East Texas and South Texas hotter temperatures are found closer to the surface then in West Texas.

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This Texas map shows the regional temperatures of oil and gas wells at 10,000 feet beneath the surface of the earth.

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