Microgeneration described as a system of small heat and power generation equipment (under 50 kW) in buildings, based on the use of heating and hot water to generate electricity. It uses the heat of the hot water and heating. This system avoids the cost and loss of power transmission and distribution, because the energy is generated at the same point at which it is consumed. It describes the main technologies available are: internal combustion engines, the external combustion and microturbines.