There are no other ISOs across North America. ERCOT is the first American independent system operator (ISO). The flow of electric power on the Texas Interconnection is managed by Electric Reliability Council of Texas (ERCOT). This led to blackouts that affected more than 4 million people. In February 2021, record-low temperatures caused disruptions to power production, and Texas Interconnection could not meet customer demand. The interconnection is often overburdened during summers when people use air-conditioning to cool their homes and businesses. The grid has a network of 550 generation units and 46,500 miles of transmission lines. Similar minor interconnections include Quebec Interconnection and the Alaska Interconnection. However, the Texas Interconnection draws power at times from other grids. It is a wide-area synchronous grid maintained separately for political reasons rather than precisely due to technical necessities. The Texas Interconnection is a minor grid that covers much of the state of Texas.
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