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.
The primary sources of greenhouse gas emissions in the United States are: (29 percent of 2015 greenhouse gas emissions) â Electricity production generates the largest share of greenhouse gas emissions. Approximately 67 percent of our electricity comes from burning fossil fuels, mostly coal and natural gas. (27 percent of 2015 greenhouse gas emissions) â Greenhouse gas emissions from transportation primarily come from burning fossil fuel for our cars, trucks, ships, trains, and planes.