Energy in Briefs explain important energy topics in plain language. Each Brief answers a question relevant to the public and recommends resources for further reading. Please use the tools to the right to give us feedback, share with others, or sign up for notices as new Briefs are released.
April 30, 2009
What are biofuels and how much do we use?
Biofuels are liquid fuels produced from biomass materials and are used primarily for transportation1. The term biofuels most commonly refers to ethanol and biodiesel. In 2007, the United States consumed 6.8 billion gallons of ethanol and 491 million gallons of biodiesel. By comparison, 2007 consumption of motor gasoline and diesel (not inclusive of biofuels) was 139 billion gallons and 39 billion gallons, respectively.
April 23, 2009
What are the major sources and users of energy in the United States?
The major energy sources in the United States are petroleum (oil), natural gas, coal, nuclear, and renewable energy. The major users are residential and commercial buildings, industry, transportation, and electric power generation. The pattern of fuel use varies widely by sector. For example, oil provides 96% of the energy used for transportation, but only 2% of the energy used to generate electric power. Understanding the relationships between the different energy sources and their uses provides insights into many important energy issues.
April 23, 2009
How dependent are we on foreign oil?
The United States imported about 58% of the petroleum, which includes crude oil and refined petroleum products, that we consumed during 2007. About half of these imports came from the Western Hemisphere. Our dependence on foreign petroleum is expected to decline in the next two decades.
April 22, 2009
How much renewable energy do we use?
Americans used renewable energy sources--water (hydroelectric), geothermal, wind, sun (solar), and biomass--to meet about 7% of our total energy needs in 2007.
March 12, 2009
How can we compare or add up our energy consumption?
To compare or aggregate energy consumption across different energy sources like oil, natural gas, and electricity, we must use a common unit of measure. This is similar to calculating your food energy intake by adding up the calories in whatever you eat.
March 3, 2009
How does natural gas travel from producing fields to consumers?
The national natural gas transportation network delivered more than 23 trillion cubic feet of natural gas during 2008 to about 70 million customers. The network, excluding gathering system operators, is made up of more than 200 mainline transmission pipeline companies, more than 1,300 local distribution companies, and about 125 underground natural gas storage operators.
January 28, 2009
Who are the major players supplying the world oil market?
Governments of oil-rich countries have a major influence on the world supply of oil through ownership of national oil companies and, for some governments, their membership in OPEC.
September 8, 2008
How much does the Federal Government spend on energy-specific subsidies and support?
The Federal Government spent an estimated $16.6 billion in energy-specific subsidies and support programs in Fiscal Year (FY) 2007. Energy-specific subsidies have more than doubled since FY 1999.
July 10, 2008
What are greenhouse gases and how much are emitted by the United States?
Greenhouse gases trap heat from the sun and warm the planet's surface. Of U.S. greenhouse gas emissions, 87% are related to energy consumption. Since 1990, greenhouse gas emissions in the United States have grown by about 1% per year. In 2005, about 21% of the world's total energy-related carbon dioxide was emitted by the United States.
June 17, 2008
What are natural gas customer choice programs?
Customer choice programs let households and small commercial establishments purchase natural gas from someone other than their traditional utility company. However, utility companies still deliver the natural gas to consumers.
May 9, 2008
How is my electricity generated, delivered, and priced?
Many technologies and fuels are used to generate electricity at power plants, which is then delivered to consumers through a complex network of lines and equipment known as the "grid." The price that consumers pay for electricity is determined by weather factors, fuel costs, consumer demand, and regulations.
May 1, 2008
What is liquefied natural gas (LNG) and how is it becoming an energy source for the United States?
The United States imports about 16% of the natural gas we consume. Most of these imports are delivered by pipeline (from Canada). But a growing volume of natural gas is coming to the United States in liquid form from overseas. With the demand for natural gas expected to increase, it's likely that U.S. imports of LNG also will need to increase.
