The heat beneath our feet, as a geothermal energy resource, seems to have the potential to provide a portion of the world's energy demands, whether by direct heat offer or power generation. The major research challenge has been to develop a technique to economically and efficiently collect thermal energy from the ground. Drilling new geothermal wells, which cost over half of the plant's total budget, is a major limitation in allocating money. There are millions of abandoned/exploratory hydrocarbon wells, however, that can be used to collect heat from the ground. These existing hydrocarbon wells can be regarded as a viable option since most of them have the capacity to generate enough heat for direct consumption and power generation.