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.
No comments:
Post a Comment