[jcp123]

Originally Posted by jamesqf

If diesels are more efficient than gas turbines, then why are there many gas turbine-powered generating plants, while diesels are only a niche application, mostly for backup & emergency power? And why are there so few diesel-engined airplanes?

Gas turbine power is relatively cheap and the turbines can be run at their max efficiency. Gas can be main lined into a facility much easier than diesel. Diesels are favored for backup generation because of their much quicker startup time vs a turbine generator. Diesel, as I understand, is also not favored in airplanes because of weight.