ItsNotAboutTheMoney
Well-Known Member
No doubt that NG CCGT is more efficient than other fossil fuel combustion methods but I cannot think of a good reason why all the plants operating at much lower efficiencies should be ignored. Unless you have a personal NG CCGT in your garage, a fairer comparison would be a residential generator that combusts petrol. Their efficiency is ~ 10 - 15% IIRC
I focused on CCGT because it's taking over baseload generation, and PEV demand is mostly going to be evening and night-time charging.
Natural gas generators make up the largest share of overall U.S. generation capacity - Today in Energy - U.S. Energy Information Administration (EIA)
CCGT was 53% of natural gas capacity, but has a much higher capacity factor than the simpler peaker plants, which implies that it is the dominant generation method in natural gas.
Even though capacity factors have increased, there's clearly more to spare.
Given also that major trend in generation is the shift to NG and to renewables (together now almost half of all US generation, up from 30% 10 years ago), and given that there's still significant unused CCGT capacity, and given the PEV demand will be new demand, and given that significant growth in PEVs almost certainly implies increased used of batteries on the electricity grid that would allow for more renewable generation and other efficiencies, I think it's pretty reasonable to focus heavily on the CCGT efficiency over other generation.