Most of the reason that natural gas generators are not more efficient is that utilities aren't willing to pay for that efficiency. Natural gas is more expensi

Most of the reason that natural gas generators are not more efficient is that utilities aren't willing to pay for that efficiency. Natural gas is more expensive than coal but it can be used in realively inexpensive gas-turbine generators that can be spun up and down quickly to meet rapid swings in demand. Since those plants are only opearted part-time, utilities worry more about capital efficiency than fuel efficiency. Unless these things are cheaper, their added efficiency might not win many existing natural gas generation customers.