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The paper presents an analysis of energy and economic effectiveness of the combined heat and power (cogeneration)  technologies fired with natural gas  that may be deemed prospective for  the Polish  electric  power  system. The  current  state  of  the  cogeneration  technologies fired with natural gas in Poland is presented. Five cogeneration technologies fired with natural gas, prospective  from  the point of view of  the Polish electric power  system, were  selected  for  the analysis.  Namely,  the  paper  discusses:  gas-steam  combined  heat  and  power  (CHP)  unit  with 3-pressure  heat  recovery  generator  (HRSG)  and  steam  interstage  reheat,  gas-steam CHP  unit with 2-pressure HRSG, gas-steam CHP unit with 1-pressure HRSG, gas CHP unit with  small scale gas turbine, operating in a simple cycle and gas CHP unit with gas engine. The following quantities characterizing the energy effectiveness of the cogeneration technologies were selected for the analysis: electricity generation efficiency, heat generation efficiency, primary energy savings (PES) and CO2 unit emission. The economic effectiveness of particular technologies was

Energy and economic effectiveness of gas and gas-steam combined heat and power units fired with natural gas