Four EU research workers were invited from Portugal, Italy and France for promoting R & D of petroleum substituting energies in Japan. The joint research on the wide area energy use network system (advanced district cooling and heating) includes the experimental technology for measuring heat transfer acceleration and drag reduction, evaluation of rheological characteristics of fluid, and development and selection of an adequate composition equation of fluid. The joint research on MCFC includes the test method and procedure of components and cells in relation to corrosion by molten carbonate, elution of NiO cathodes, electrode modeling and alternative materials for cathodes. The joint research on geothermal gases includes the research method of fumarolic gases such as volcanic gas and geothermal gas, applications in Italian geothermal fields and the relation of geothermal gases with the origin of fluid, deep conditions and volcanic activity. In addition, the joint research on light energy conversion (energy transfer system between binuclear metal complexes) and the performance and use of metal complexes as catalyst for polymer electrolyte fuel cells was also performed. 52 refs., 20 figs., 3 tabs.