The performance analysis of a multigeneration (MG) energy system integrated into a conventional coal-fired power plant was evaluated and discussed according to the data measured in the existing steam power plant. The multigeneration energy system in the present work consists of four subsystems, namely Organic Rankine Cycle (ORC), Vapor Compression Refrigeration (VCR) System, Thermal Vapor Compression Desalination Plant (TVCDP) and Greenhouse Heating (GH) System. The thermodynamic analysis was performed through energy and exergy analyses associated with the efficiencies of the subsystem as well as the multigeneration plant. In addition, environmental impact analysis was carried out to calculate CO2 emission of the overall system to evaluate the effect of emissions caused by the energy systems. The results revealed that when the conventional steam power plant became multigeneration, the exergy efficiency increased from 39.1% to 39.84% and energy efficiency increased from 41.5% to 42.29%. Four subsystems were integrated into the existing steam power plant to reduce CO2 emissions from 230 kg/MWh to 225 kg/MWh.