Energy Storage Will Soon Replace Simple Cycle Combustion Turbine Peaker Plants. Power grids need extra generating capacity to work properly. For example, about 20 percent of New York Stateâs generation fleet runs less than 250 hours a year. Because they donât run much, âpeaker plantsâ are by design the cheapest and least efficient fossil generators.
The largest source of carbon dioxide (CO2) emissions are currently  from electric generation through the combustion of fossil fuels.  Particularly the burning of coal is mos â¦ t pollutive, as compared to  oil or natural gas generation.
Specifically the emission of Carbon dioxide, methane  and several other greenhouse gases.   A:  The CO2 from burning fossil fuels is one of the causes of global  warming, but ironically, the solid particles (soot) which also  comes from fossil fuels is filtering out sunlight and having a  cooling effect.