Geothermal Energy Feasibility Study in Southern Texas

Geothermal energy is largely underused in many regions due to low geothermal activity or high ground surface temperatures[LB1] . A geothermal power plant's efficiency depends on the difference in temperature between the heat reservoir and surface temperature, so a lesser difference would raise costs to produce the same amount of energy. This study evaluates the feasibility of a geothermal power plant in Texas, where both limitations apply. However, because drilling equipment is easily accessible due to the active oil industry, it is worthwhile to determine whether the endeavor would be financially rewarding.

This study specifically researched working fluids and potential geothermal plant installations, where an Organic Rankine Cycle was the best fit. This research included a consultation with a geothermal energy plant in southern Idaho. In addition, different working fluids were assessed, such as isobutane, propane, and benzene due to performance in the cycle and lower environmental impacts.

High-level numerical calculations helped determine that a power plant located in southern Texas may be a sound investment due to low drilling costs. Efficiencies would likely be lower, but the low environmental impact and aid to the power grid may negate the downsides of these low efficiencies.