Power plants, transmission lines, and end-users of electricity make up today's United States electricity system.
FREMONT, CA: The current electricity system in the United States is a complicated network of power plants, transmission and distribution cables, and end-users. Today, most Americans obtain their electricity from centralized power plants that employ a range of energy sources, including coal, natural gas, nuclear energy, and renewable resources, to generate electricity. This complicated system of generation, distribution, and end-users are commonly known as the electric power grid.
How and where electricity is generated
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The United States generates electricity from a range of resources. Natural gas, coal, and nuclear power are the most popular forms of energy. One of the fastest-growing energy sources is wind and solar. Most electricity in the United States is produced at centralized power plants. Distributed generation is a collection of technologies that generate electricity onsite or near where it will be used, such as onsite solar panels and combined heat and power. Distributed generation accounts for a much smaller proportion of total electricity production, but this proportion is growing. Gain a deeper understanding of centralized and distributed generation.
Electricity distribution and use
Once energy is produced in a centralized power plant, it is transmitted over a network of interconnected high-voltage transmission lines. Through a network of distribution lines, substations "step down" high-voltage power to a lower voltage before transferring it to customers. Learn more about the delivery of power.
Each residential, commercial, and industrial user accounts for approximately one-third of the nation's total power consumption, and transportation accounts for a minor portion of total electricity use. Learn more about electricity end-users.
How the grid balances supply and demand
The power utilized in households and businesses varies according to the day, time, and weather. Generally, power must be generated at the time of use. Electric utility providers and grid operators must collaborate to meet demand with the appropriate amount of power generation. When demand increases, operators can respond by increasing production from power plants already running, generating electricity from power plants already running at a low level or in standby mode, importing electricity from distant sources, or contacting end-users who have agreed to reduce their electricity consumption.