Raser Technologies is developing geothermal power plants which use hot spots on the earth's surface to drive steam turbines. They estimate that their initial [small-ish] plant can generate 11 megawatts with room to expand.

Water deep underground is heated by the earth's natural heat. The hot water is brought to the surface and delivered to Raser's modular power generation array through pipes. The hot well-water is then distributed to each of the fifty power generation units in the network in parallel via the large pipes feeding each row of 25 units. Each power generation unit produces its own power simultaneously from the hot well water.