In the nuclear research plant (KFA) at Jiilich, Germany, a concept for a potential future energy transport system was proposed based on the exothermic CO/H, conversion to CH,. In the socalled ADAM-EVA circulation process, methane is steam reformed (endothermic) into a CO/H, mixture using heliumtransported heat from a nuclear reactor (EVA), the gas mixture is supplied to the consumer by pipeline and there methanated (exothermic; ADAM). The methane formed is fed back to the EVA reformer. In 1979, an ADAM-EVA pilot plant was brought on line in KFA-Julich; in 1981, it was expanded to a capacity of 10 MW.