AbstractThis paper discusses the problems of using refuse‐recovered low Btu gases as fuel of high‐temperature regenerative gas turbines. First, it is briefly described that the system using refuse‐recovered fuels has a great possibility of being superior both in energy conservation and in solving refuse disposal problems in urban areas. Next, by taking a fermentation gas of the sewage sludge and a pyrolysis gas of the municipal refuse as examples, it is confirmed that a combustion gas with the high flame temperature required for a high efficiency gas turbine can sufficiently be obtained. Finally, through a case study in which no special condition is assumed, the system using these refuse‐recovered low Btu gases whose flame temperatures are low is shown to be excellent in the thermal NOxformation characteristics as compared to that using the conventional fuel with a high calorifi