A new polygeneration application with renewable energy sources will be planned and demonstrated for the fishery industry. The distributed energy system utilizes cleaning waste of a fish processing plant to produce biodiesel. The biodiesel is used to produce the locally needed cooling/freezing and heating energy. In addition, a power surplus is generated for the electricity network or local industrial use.The research contribution focuses on optimisation, simulation, validation and planning of piloted concepts. A energy integration auditing and optimisation tools will be developed to carry out feasibility studies for the fishery industry. The advanced CO2 based freezing/cooling system requires optimization and control system planning of special high-pressure equipments. The final biodiesel will be tested in appropriate engines.With a view to marketing possibilities the demonstration will take place in Vietnam. In the demonstration case, the main product of the fish processing plant is catfish filet (about 40 t/d). The fat content of 22 per cent in the fish cleaning waste results in a production of biodiesel of about 13 t/d. A part of biodiesel is used to produce electricity for the locally needed cooling/freezing (0.3 MW) and heating (1,3 MW) energy. In addition, a power surplus (0,8 MW) is generated for the local industrial use.