Cogeneration refers to the same heat and power generation plant will be a joint together, referred to as CHP. Combined heat and power plant would have abandoned the common heat be used, in order to provide low-cost industrial and domestic heating with hot, this would greatly enhance thermal efficiency. The usual thermal energy, its efficiency is about 30 ~ 35%. This means that for every 1 MJ of energy output, there are two megajoules of energy wasted. This part of the heat re-used for heating water, near the factory fully meet the region's factories and residential heating needs. Cogeneration usually steam turbine-driven generator, but will exhaust is used to supplement the existing boiler plant heating, the total efficiency up to 80%.