No problem.
Gas turbines have their niche. For power generation, they can't be beaten when run at high load (max effienciency) in combined cycle (with a steam turbine utilising the exhaust heat). Overall efficiencies can now exceed 60%.
A small gas turbine in simple cycle (no steam turbine)...
I don't know where you're getting the idea that gas turbines are efficient, they're not.
Small ones are especially inefficient.
Gas turbines have several advantages:
- Very high reliability / low maintenance
- Very high power to weight ratio
- Very high maximum power
- Low capital cost per MW...