How can Geothermal Energy be used as a substitute for Fossil fuel energy in homes today?

If the location is suitable for geothermal energy use, that is, if there are hot rocks not too far below the surface of the earth, then a power plant can be built. This will generate clean electricity which can be fed into the grid and so to homes. Geothermal power plants mean that polluting fossil fuel (coal, oil and natural gas) power plants can be phased out.