Natural gas power plant
CCPP reach 58% efficiency at producing electric power, new planned are designed for beyond 60%. Why are in the Applied Materials calculator only 46.7%.
$637 millions expenses for natural gas for $6 per MMBTU are saved by the photovoltaic power plant. 14537 GWh electric power by photovoltaic replaces 31113 GWh thermic energy from natural gas. So the average efficiency in this calculation is only 46.7%. Why?
When the Diesel engine of a modern car would have always 40% efficiency, we would drive much more economical. But the maximal efficiency is only at an ideal working point. Cold start, partial load are unfavorable operating states with a much lower efficiency. You make this experience each time at the gasoline station, this happens also at a gas power plant. There is the maximal efficiency at ideal conditions and there is the average efficiency when the electric power production is always adjusted to the demand.
With a possibility to store electric power is it possible to bring the average efficiency much closer to the optimal efficiency. An improvement to 55% would save 18% natural gas.