Our GE MS5001 PA efficiency only 28% at temp = 26.8 C and RH = 84.2% and load = 100% (24.9MW with 8.4 t/ht of steam injection). Normal operation only 24% efficiency
The highest, commercially available, industrial type GT efficiency goes to the GE 9H with 60% - but can only work in combined cycle: i.e. it is a GT coupled with a ST (single shaft combined cycle)