We live in a world where oil, gas and coal reserves are running out. This statement may be sad, but it is good news because the high consumption of these fuels has accelerated the process of global warming. Unfortunately, since about 80-90% of the energy needed in the whole world is provided by fossil fuels, it is not possible to reduce their consumption overnight. But there is a question: what can be done now that renewable energies such as solar or wind energy cannot play the main role in the field of energy supply? One solution is to shift some of our power plants to different systems called Combined Heat and Power (CHP). The simultaneous production of electricity and heat provides the possibility of better efficiency than fossil fuels for providing energy with about 15-40% energy storage. These power plants perform well both in terms of cost reduction and environmental impact reduction.