![]() One grid connects most of continental Europe. North America has four major interconnections: Western, Eastern, Quebec and Texas. The voltage is stepped up for transmission, then reduced for local distribution.Ī wide area synchronous grid, known as an "interconnection" in North America, directly connects generators delivering AC power with the same relative frequency to many consumers. The voltage level is changed with transformers. Transmission lines use either alternating current (AC) or direct current (DC). This reduces the losses produced by strong currents. The combined transmission and distribution network is part of electricity delivery, known as the electrical grid.Įfficient long-distance transmission of electric power requires high voltages. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. The interconnected lines that facilitate this movement form a transmission network. ![]() The entire 7079 MW nameplate generation capacity of the dam is accommodated by these six circuits.Įlectric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. ![]() Two additional circuits are obscured by trees on the far right. Five-hundred kilovolt (500 kV) Three-phase electric power Transmission Lines at Grand Coulee Dam. ![]()
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