Cogeneration plants comprise combined heat and power systems that generate electricity and heat simultaneously by burning various fuels, primarily natural gas, in an engine or turbine. The primary goal of cogeneration is to optimize the energy efficiency obtained from primary fuel sources. Trigeneration systems deliver energy to businesses in three forms simultaneously: electricity, heating, and cooling. By utilizing a single source to produce multiple forms of energy, including electricity, heating, and cooling, cogeneration and trigeneration systems can achieve exceptionally high overall energy efficiency, exceeding 90%. The forms of energy required by consumers are delivered to businesses in the necessary quantities and at the appropriate times to meet their needs. Cogeneration and trigeneration systems offer economic benefits while significantly reducing carbon emissions, thereby supporting the protection of both nature and humanity. In the field of distributed power, significant emphasis is placed on the installation of unlicensed Solar Power Plants (SPPs) within the framework of energy performance contracts designed to meet clients’ self-consumption needs.