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.
Carbon Dioxide. Carbon dioxide (CO2), which comes mainly from burning fossils fuels, is one of the top three greenhouse gases. Though not as high on the GWP scale as methane, CO2 accounts for the majority of greenhouse gas emissions in the United States -- 85 percent, noted Koerner.Vehicles are the biggest contributor.ethane, which comes from natural gas, landfills and cow flatulence, is one of the top three greenhouse gases, according to the Popular Science website. Methane has a Global Warming Potential (GWP) rating of 21.