1) Cogengenration
Cogeneration or combined heat and power (CHP) is defined as the sequential generation of two different forms of useful energy from a single primary energy source, typically mechanical energy and thermal energy. Mechanical energy may be used either to drive an alternator for producing electricity or rotating equipment such as motor, compressor, pump or fan for delivering various services. Thermal energy can be used either for direct process applications or for indirectly producing steam, hot water, hot air for dryer or chilled water for process cooling.
Cogeneration provides a wide range of technologies for application in various domains of economic activities.

2) Tri-Generation
A plant producing electricity, heat and cold is called a trigeneration plant. Cogeneration systems linked to absorption chillers or adsorption chillers use waste heat for refrigeration. Trigeneration, or combined cooling, heat and power (CCHP), is the process by which some of the heat produced by a cogeneration plant is used to generate chilled water for air conditioning or refrigeration. An absorption chiller is linked to combined heat and power (CHP) to provide this functionality.

3) Captive Power
A plant producing electricity only from the fuel (Coal/Biomass/gas) and utilizing a fully condensing turbine to generate Power from all available steam is called captive power. This kind of system is often used to sell power to the Grid or supply power to the industrial zone.

4) Incidental Power
A process that requires, lower steam Pressure, in such cases Steam can be generated at high pressure using fuel (Coal/Biomass) and high-pressure steam passes through Back Pressure turbine and the exhaust steam of the turbine will be feed to the process. The exhaust pressure for the back pressure turbine can be regulated based on the process pressure requirement. These This is a useful phenomenon to generate power and save of on electricity costs, for small to medium-scale industries.