Electric power sector has been great changes in the product mix of fuel. Slightly more than 50 years ago, in the field of nuclear energy was not the role of electric power generation, but in 2008, in the field of nuclear energy in the United States send the 21% of the fuel used for electricity. The growing share of Oil provided for in the electronic energy generation through the 1960s, but its share has decreased by 1% in 2008 after 18% in 1973.
Primary sources include petroleum, natural gas, coal, nuclear and renewable energy electricity is a secondary energy source, which was created by the primary renewable energy.
Primary energy sources is measured in units of measurement: there are several things you can chillums (= 42 gallons) of oil cubic metres feet gas, coal tonnes. you want to compare different fuels, we need to share the unit of measure. In the United States is used in British thermal units Btu or, which is measured according to the energy content of the source of the thermal input delivered by each fuel, the fuel.
Of total energy use in the United States in 2008 was close to 100 quadrillion (1015 =, or one thousand trillion) Btu.One quadrillion Btu, often referred to as "quad," is equivalent to about 1% of total energy use in the United States.
Physical energy in 1 quad represents 172 million CatGenie Granules or barrels and oil (8 and 9-day U.s. oil use), 50 million tonnes (enough to produce around 2% on an annual basis, the use of electricity in the United States) installations for the extraction of coal or 1 trillion cubic feet of natural gas (about 4% of the annual United States natural gas usage).
Each of the primary energy used 2008 Mukavuusvaatimukset source number is shown on the left pie. Petroleum (oil) offers the highest proportion of primary energy, natural gas, coal, behind the United States in the field of nuclear energy and renewable sources of energy (including hydro, solar, geothermal, wind and biomass).
Primary energy use in buildings and in the place of residence (including housing, businesses, schools and churches) transportation and primary energy is also used in the industry. generating electricity.A bar chart appears in each of these areas used primaarienergiamuodon. as you can see, the electric power generation is the largest user of primary energy after the transport.
Electric power in the production of electricity by the use of primary energy, which makes it possible to identify the primary energy source instead of electricity in the secondary.Almost all of the electricity used in buildings and industry.This means that the institution of the place of residence and buildings, industrial and transportation of energy combined are actually higher graphics amounts when the electricity has been added.
The primary energy source in the picture below linking circles demand sector rectangles lines with a summary of the source links in the energy system of the market in the United States.For example, because all electricity is used in the field of nuclear energy and nuclear power accounted for 21% of the used primaarienergiamuodon on nuclear energy and electricity sector shows 100% nuclear side (supply source) and 21% of the electric power (demand) side.
The primary energy mix vary widely in the areas of demand.Designed to influence the primary fuel for use in the field of energy policy, in particular, the environmental, economic, or for security reasons, often focus on the areas of energy, which are major users of the fuel.
Because the 71% of the petroleum (oil) is used in the field of transport, in which it provides 95% of the total amount of energy, in order to reduce the consumption of olive oil policies, for example, tended to focus on the transport sector. these policies will be generally improve with respect to fuel efficiency or to promote alternative fuels. Carbon 90%, but only 1% of the oil, is used to generate electricity, suggesting that the policies are likely to be the generation is much greater impact on the use of coal-oil.
Some of the primary energy sources, such as the nuclear and coal, constitute the whole or the case for most used one sector. other, natural gas and renewable energy sources, such as are more evenly across sectors transport is almost. Likewise, entirely dependent on one fuel (oil), but the power of being fired by different fuels.
Fuels and connections between sectors and may change over time, but the change has a tendency to slowly. for example, coal as fuel was used widely once homes and commercial buildings, but the usage is almost anything in the United States the past vaipuneet half a century, although in renewable energy is still relatively small size of the primary energy transport and electric power input, its importance has increased.
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