in a method of operating a gas turbine group with low calorific value fuel , the gas turbine group essentially comprises a compressor , a combustion chamber , a turbine and a generator . the low calorific value fuel is compressed by means of a fuel compressor . low calorific value fuel in excess of the stoichiometric quantity is mixed into part of the combustion air during the starting of the gas turbine group so that a stable flame appears . after the attainment of the rated rotational speed and synchronization , at the latest , the quantity of low calorific value fuel is reduced to such an extent that a ratio is attained which is just over the stoichiometric ratio . the rest of the low calorific value fuel is mixed into the rest of the combustion airflow in order to attain the desired load .