Showing posts with label fossil. Show all posts
Showing posts with label fossil. Show all posts
Wednesday, September 26, 2012
Monday, May 10, 2010
US Energy Sources and Demand by Sector
Where does the U. S. gets its energy?
85% from fossil fuels:
39% from petroleum
23% from natural gas
23% from coal
8% from nuclear fission - all used for electricity
3% from biomass - mostly used for fuel
3% from hydro - mostly used for electricity
1% from geothermal, wind and solar total
What happens to this energy?
55% is utilized:
41% used directly as fuel for vehicles, as feedstocks for industrial products, and heat sources for buildings
14% as electricity output from power plants
45% is lost as "waste heat"
27% lost in conversion from chemical to electrical energy
18% lost in conversion from chemical energy to mechanical energy
What is this energy used for?
31% used by industry
29% used for transportation
21% residential uses, such as heating, cooling and lighting
18% commercial uses, such as heating, cooling and lighting
Source: MIT Technology Review, May/June 2010.
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