http://tonto.eia.doe.gov/energy_in_brief/ Each Energy in Brief concisely answers an energy question of importance to the public. The Briefs clearly explain the meaning of EIA's energy data and analyses and link to more information from EIA. en-us Mon, 10 Aug 2009 12:00:00 EST http://www.eia.doe.gov/images2/eiasmltitle.gif http://www.eia.doe.gov/ US Energy Information Administration http://tonto.eia.doe.gov/energy_in_brief/nuclear_industry.cfm Mon, 10 Aug 2009 12:00:00 EST There are currently 104 commercial nuclear reactors at 65 nuclear power plants in 31 States. Since 1990, the share of the Nation’s total electricity supply provided by nuclear power generation has averaged about 20%, with the level of nuclear generation growing at roughly the same rate as overall electricity use. Between 1985 and 1996, 34 new reactors were placed in service. In addition, nuclear generation has increased as a result of higher utilization of existing capacity and from technical modifications to increase nuclear plant capacity (expressed in megawatts). In response to incentives provided by the Energy Policy Act of 2005, nuclear power output is expected to grow, but at a slightly lower rate than total electricity generation. images/thumbnails/nuclear-industry-thumb.jpg images/features/nuclear_industry_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/liquefied_natural_gas_lng.cfm Tue, 28 Jul 2009 17:00:00 EST On an annual basis over the past five years, the United States imported between 13% and 16% of its natural gas requirements. Most of these imports were in gaseous form delivered by pipeline from Canada. However, natural gas imports have also come in liquid form from overseas. Between 1% and 3% of U.S. demand for natural gas was met by LNG in the past five years. images/thumbnails/lng-thumb.jpg images/features/lng_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/biofuels_use.cfm Thu, 30 Apr 2009 16:00:00 EST 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. images/thumbnails/biofuel-thumb.jpg images/features/biofuel_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/major_energy_sources_and_users.cfm Thu, 23 Apr 2009 15:30:00 EST 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. images/thumbnails/major-sources-users-thumb.jpg images/features/major-sources-users_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/foreign_oil_dependence.cfm Thu, 23 Apr 2009 12:00:00 EST 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. images/thumbnails/oil-tanker-thumb.jpg images/features/oil_tanker_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/renewable_energy.cfm Wed, 22 Apr 2009 14:00:00 EST Americans used renewable energy sources--water (hydroelectric), geothermal, wind, sun (solar), and biomass--to meet about 7% of our total energy needs in 2007. images/thumbnails/renewables-thumb.jpg images/features/renewables_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/comparing_energy_consumption.cfm Thu, 12 Mar 2009 15:30:00 EST 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. images/thumbnails/comparing-energy-consumption-thumb.jpg images/features/comparing_energy_consumption_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/natural_gas_pipeline.cfm Tue, 03 Mar 2009 15:30:00 EST 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. images/thumbnails/pipeline-thumb.jpg images/features/pipeline_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/world_oil_market.cfm Wed, 28 Jan 2009 4:00:00 EST 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. images/thumbnails/world-oil-thumb.jpg images/features/world_oil_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/energy_subsidies.cfm Mon, 08 Sep 2008 11:30:00 EST 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. images/thumbnails/fuel-subsidies-thumb.jpg images/features/fuel_subsidies_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/greenhouse_gas.cfm Thu, 10 Jul 2008 07:00:00 EST 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. images/thumbnails/ghg-thumb.jpg images/features/ghg_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/natural_gas_customer_choice.cfm Tue, 17 Jun 2008 13:30:00 EST 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. images/thumbnails/natural-gas-choice-thumb.jpg images/features/natural_gas_choice_feature.jpg http://tonto.eia.doe.gov/energy_in_brief/electricity.cfm Thu, 09 May 2008 14:00:00 EST 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. images/thumbnails/electricity-thumb.jpg images/features/electricity_feature.jpg