The electricity sector of the United States includes a large array of stakeholders that provide services through electricity generation, transmission, distribution and marketing for industrial, commercial, public and residential customers. It also includes many public institutions that regulate the sector. In 1996, there were 3,195 electric utilities in the United States, of which fewer than a 1,000 were engaged in power generation. This leaves a large number of mostly smaller utilities engaged only in power distribution. There were also 65 power marketers. Of all utilities, 2,020 were publicly owned (including 10 Federal utilities), 932 were rural electric cooperatives, and 243 were investor-owned utilities. The electricity transmission network is not owned by individual utilities, but by Independent System Operators or Regional Transmission Organizations, which are not-for-profit organizations that are obliged to provide indiscriminate access to various suppliers in order to promote competition. They are associated in the North American Electric Reliability Corporation and are typically jointly owned by the utilities in their service area.
The four above-mentioned market segments of the U.S. electricity sector are regulated by different public institutions with some functional overlaps: The federal government sets general policies through the Department of Energy, environmental policy through the Environmental Protection Agency and consumer protection policy through the Federal Trade Commission. The safety of nuclear power plants is overseen by the Nuclear Regulatory Commission. Economic regulation of the distribution segment is a state responsibility, usually carried out through Public Utilities Commissions; the inter-state transmission segment is regulated by the federal government through the Federal Energy Regulatory Commission.
Of the electricity generated in the United States in 2006, 70% was produced from fossil fuels (mainly coal and natural gas), almost 20% came from nuclear power, 7% from hydropower and 3% from other forms of renewable energy such as wind and solar energy.
The share of renewable energy, in particular wind and solar energy, has increased substantially since 2006 and is expected to increase further.
In 2008 the average electricity tariff in the U.S. was 9.82 Cents/kilowatt-hour (kWh). In 2006-07 electricity tariffs in the U.S. were higher than in Australia, Canada, France, Sweden and Finland, but lower than in Germany, Italy, Spain and the UK. Residential tariffs vary significantly between states from 6.7 Cents/kWh in West Virginia to 24.1 Cents/kWh in Hawaii. The average residential bill in 2007 was US$ 100/month. Most investments in the U.S. electricity sector are financed by private companies through debt and equity. However, some investments are indirectly financed by taxpayers through various subsidies ranging from tax incentives to subsidies for research and development, feed-in tariffs for renewable energy and support to low-income households to pay their electric bills.
coal, oil, natural gas hydroelectric nuclear Other renewables
In 2007 the total installed electricity generation capacity in the United States was 1,088 Gigawatt. The main energy sources for electricity generation include:
Thermal/Fossil 857 GW
Nuclear 106 GW
Hydropower 78 GW
Wind 17 MW (25 MW in 2008)
Actual electricity generation in 2007 was 4,157 Terrawatthours, generated from the following sources:
Thermal/Fossil 2,977 TWh
Nuclear 806 TWh
Hydropower 248 TWh
Other renewables 105 TWh (including landfill gas, geothermal energy, solar and wind)
The share of coal and nuclear in power generation is much higher than their share in installed capacity, because coal and nuclear plants provide base load and thus are running longer hours than natural gas and petroleum plants which typically provide peak load, or than wind turbines or solar plants that cannot produce electricity continuously.
Electrical Production in the United States for 2006
Units in Operation
Total Nameplate Capacity (MW)
% of total Capacity
Annual Production (billion kWh)
% of annual production
Petroleum Coke Fueled Boiler
Oil Fired Boiler
Natural Gas Fueled Boiler
Combustion Turbine Generators
Combined Cycle Natural Gas
Coal Fired Boilers
Coal and Gas
see also:Coal power in the United States
Fossil fuels - mainly coal and natural gas - remain the backbone of electricity generation in the U.S., accounting for 69% of installed generation capacity in 2006.
In 2007 the Department of Energy estimated the planned additional capacity for 2008-12 at 92 GW, most of which to be fueled by natural gas (48 GW) and coal (19GW).
see:Nuclear power in the United States
As of 2007 in the United States, there are 104 commercial nuclear reactors in the US, generating approximately 20% of the nation's total electric energy consumption. For many years, no new nuclear plants have been built in the US. However, since 2005 there has been a renewed interest in nuclear power in the US. This has been facilitated in part by the federal government with the Nuclear Power 2010 Program of 2002. and the Energy Policy Act. As of March 9, 2009, the U.S. Nuclear Regulatory Commission had received applications for permission to construct 26 new nuclear power reactors
see also:Renewable energy in the United States,Solar power in the United States, Wind power in the United States, List of reservoirs and dams in the United States and Category:Hydroelectric power plants in the United States
The development of renewable energy and energy efficiency marks "a new era of energy exploration" in the United States, according to President Barack Obama. In a joint address to the Congress on February 24, 2009, President Obama called for doubling renewable energy within the next three years.
Renewable energy accounted for more than 10 percent of the domestically-produced energy used in the United States in the first half of 2008, consisting mainly of large hydropower. According to a report by the Interior Department, U.S. wind power - including off-shore turbines - could more than meet U.S. electricity needs.. The Department of Energy has said wind power could generate 20% of US electricity by 2030.
Several solar thermal power stations, including the new 64 MW Nevada Solar One, have also been built. The largest of these solar thermal power stations is the SEGS group of plants in the Mojave Desert with a total generating capacity of 354 MW, making the system the largest solar plant of any kind in the world. The largest solar photovoltaic plant in the U.S. is the 14 MW Nellis Solar Power Plant, located near Las Vegas, Nevada, which is expected to produce more than 30 million kWh/year for Nellis Air Force Base.
Energy efficiency and conservation
The federal government promotes energy efficiency through the Energy Star program. The Alliance to Save Energy, an industry group, also promotes energy efficiency.
Responsibilities in the electricity sector
Policy and regulation
Policy. Policy for the electricity sector in the United States is set by the executive and legislative bodies of the federal government and state governments. Within the executive branch of the federal government the Department of Energy plays a key role. In addition, the Environmental Protection Agency is in charge of environmental regulation and the Federal Trade Commission is in charge of consumer protection and the prevention of anti-competitive practices.
Key federal legislation related to the electricity sector includes:
the Federal Power Act of 1935 that promoted hydropower and increased the role of the federal government in the sector,
the National Energy Act of 1978, including the Public Utility Regulatory Policies Act (PURPA), which required utilities to provide residential consumers with energy conservation audits and other services to encourage slower growth of electricity demand, and was intended to promote renewable energy with the result of promoting mainly co-generation;
the Energy Policy Act of 1992 which provided further incentives for energy efficiency and removed obstacles to wholesale competition; and
the Energy Independence and Security Act of 2007 which phased out incandescent light bulbs.
Many state governments have been active in promoting renewable energy. For example, in 2007 25 states and the District of Columbia had established renewable portfolio standards (RPS). There is no federal policy on RPS.
See also:List of United States Energy Acts
Regulation. The Federal Energy Regulatory Commission is in charge of regulating interstate electricity sales, wholesale electric rates, and licensing hydropower plants. Rates for electricity distribution are regulated by state-level Public Utilities Commissions or Public Services Commissions.
see also:Category:Public utilities commissions of the United States
Deregulation and competition
Deregulation of the electricity sector consists in the introduction of competition and the unbundling of vertically integrated utilities in separate entities in charge of electricity generation, electricity transmission, electricity distribution and commercialization. The deregulation of the electricity sector in the U.S. began with the Energy Policy Act of 1992 which removed obstacles for wholesale competition. In practice, however, regulation has been unevenly introduced between states. It began in earnest only from 1996 onwards when the Federal Energy Regulatory Commission issued orders that required utilities to provide transmission services "on a reasonable and non-discriminatory basis". In some states, such as in California, private utilities were required to sell some of their power plants to prevent concentration of market power.
By 2008 only about a dozen states had deregulated their electricity markets introducing competition for industrial and commercial customers, as well as for residential customers served by private utilities. The Deregulation of the Texas electricity market in 2002 is one of the best known examples.
Electric utilities in the U.S. can be both in charge of electricity generation and electricity distribution. The electricity transmission network is not owned by individual utilities, but by not-for-profit organizations that are obliged to provide indiscriminate access to various suppliers in order to promote competition. In 1996, there were 3,195 electric utilities in the United States and 65 power marketers. Of these, 2,020 were publicly owned (including 10 Federal utilities), 932 were rural electric cooperatives, and 243 were investor-owned utilities. Fewer than 1,000 utilities are engaged in power generation.
See also:List of United States electric companies
About 80% of the electricity in the U.S. is generated by private ("investor-owned") utilities. The remaining electricity is produced by federal agencies such as the Tennessee Valley Authority (producing mainly nuclear and hydropower) and the Power Marketing Administration of the Department of Energy(hydropower), municipal utilities and utility cooperatives.
The largest private electric producers in the United States include:
Southern Company, 42 GW
American Electric Power, 38 GW
Duke Energy, 36 GW
Luminant, 18 GW
Reliant Energy, 14 GW
Pacific Gas and Electric Company
There are two major alternating current (AC) power grids in North America, the Eastern Interconnection and the Western Interconnection. Besides this there are two minor power grids in the U.S., the Alaska Interconnection and the Texas Interconnection. Despite bearing separate designations, the Eastern, Western and Texas Interconnections are tied together at various points creating effectively a single grid for the contiguous U.S., Canada and parts of Mexico. The transmission grids are operated by transmission system operators (TSOs), not-for profit companies that are typically owned by the utilities in their respective service area, where they coordinate, control and monitor the operation of the electrical power system. TSOs are obliged to provide non-discriminatory transmission access to electricity generators and customers. TSOs can by of two types:Independent System Operators (ISOs) and Regional Transmission Organizations (RTOs). The former operate within a single state and the latter cover wider areas crossing state borders.
In 2009 there were four RTOs in the U.S.:
the ISO New England (ISO-NE, which is an RTO despite its name);
the Midwest Independent Transmission System Operator;
PJM Interconnection in the Mid-Atlantic region; and
the Southwest Power Pool (SPP) covering Oklahoma, Kansas and parts of Arkansas, Missouri, Texas and New Mexico.
There are also three ISOs:
the California Independent System Operator (California ISO);
the New York Independent System Operator (NYISO);
the Electric Reliability Council of Texas (ERCOT, an ISO).
The three major and two minor NERC Interconnections, and the nine NERC Regional Reliability Councils.
RTOs are similar, but not identical to the nine Regional Reliability Councils associated in the North American Electric Reliability Corporation, a non-profit entity that is in charge of improving the reliability and security of the bulk power system in the U.S., Canada and the northern part of Baja California in Mexico. The members of the Regional Reliability Councils include private, public and cooperative utilities, power marketers and final customers. The Regional Reliability Councils are:
The Eastern Interconnection
Florida Reliability Coordinating Council (FRCC)
Midwest Reliability Organization (MRO)
Northeast Power Coordinating Council (NPCC)
ReliabilityFirst Corporation (RFC)
SERC Reliability Corporation (SERC)
Southwest Power Pool, Inc. (SPP)
The Western Interconnection
Western Electricity Coordinating Council (WECC)
The Texas Interconnection
Electric Reliability Council of Texas (ERCOT)
The FERC distinguishes between 10 power markets in the U.S., including the seven for which RTOs have been established, well as:
Southwest (covering Arizona, most of New Mexico and Colorado)
ISOs and RTOs were established in the 1990s when states and regions established wholesale competition for electricity.
See:Category:Electric power transmission systems in the United States
About 75% of electricity sales to final customers are undertaken by private utilities, with the remainder being sold by municipal utilities and cooperatives.
See also:List of United States electric companies
Economic and financial aspects
Tariffs and affordability
In 2008 the average electricity tariff in the U.S. was 9.82 Cents/kWh, up from 6.9 Cents/kWh in 1995. Residential tariffs were somewhat higher at 11.36 Cents/kWh, while commercial tariffs stood at 10.28 Cents/kWh and industrial tariffs at 7.01 Cents/kWh. The cost of supplying high-voltage power to high-volume industrial customers is lower than the cost of providing low-voltage (110V) power to residential and commercial customers.
In 2006-07 commercial electricity tariffs in the U.S. (9.28 Cents/kWh) were higher than in Australia (7.1 Cents/kWh), Canada (6.18 Cents/kWh) that relies mainly on hydropower or in France (8.54 Cents/kWh) that relies heavily on nuclear power, but lower than in Germany (13.16 Cents/kWh), Italy (15.74 Cents/kWh) or the UK (11.16 Cents/kWh) that all rely to a larger degree on fossil fuels, all compared at purchasing power parity.
Residential tariffs vary significantly between states from 6.7 Cents/kWh in West Virginia to 24.1 Cents/kWh in Hawaii. An important factor that influences tariff levels is the mix of energy sources used in power generation. For example, access to cheap federal power from hydropower plants contributes to low electricity tariffs in some states.
Average residential electricity consumption in the U.S. was 936 kWh/month per in 2007, and the average bill was US$ 100/month. Average residential consumption varies considerably between states from 530 kWh/month in Maine to 1344 kWh/month in Tennessee. Factors that influence residential energy consumption are climate, tariffs and efforts to promote energy conservation.
Total revenue from the sale of electricity in 2008 was US$344bn, including US$148bn from residential customers, US$129bn from commercial customers and US$66bn from industrial customers. Many large industries self-generate electricity and their electricity consumption thus is not included in these figures.
Most investments in the U.S. electricity sector are financed by private companies through debt and equity. However, some investments are indirectly financed by taxpayers through various subsidies.
Subsidies and tax incentives
There is a large array of subsidies in the U.S. electricity sector ranging from various forms of tax incentives to subsidies for research and development, feed-in tariffs for renewable energy and support to low-income households to pay their electric bills. Some subsidies are available throughout the U.S., while others are only available in some states.
Tax incentives include federal and state tax deductions and tax breaks. Tax incentives can be directed at consumers, such as for the purchase of energy-efficient appliances or for solar energy systems, small wind systems, geothermal heat pumps, and residential fuel cell and microturbine systems. Tax incentives can also be directed at electricity producers, in particular for renewable energy.
The Low Income Home Energy Assistance Program (LIHEAP) received federal funding of $5.1 billion in Fiscal Year 2009. It is funded mainly by the federal government through the U.S. Department of Health and Human Services, Administration for Children and Families, and is administered by states and territories. While some of its funding is for fuel for heating, some is also used to cover electricity bills for both heating and cooling.
In April, 2009, 11 U.S. state legislatures were considering adopting an feed-in tariffs as a complement to their renewable electricity mandates.
Energy in the United States
California electricity crisis (2001)
Northeast Blackout of 2003
^ a b Electric Trade in the United States 1996
^ a b [http://ww