It happened in the Unit 2 main transformer of the South Texas Project Electric Generating Station near Bay City.
Officials say the fire was quickly brought under control and extinguished. The unit was automatically taken offline, but the company's other transformer, Unit 1, remained operating at 100 percent power.
The fire prompted company officials to declare an "Unusual Event," its lowest level emergency classification. A spokesperson says that classification indicates a minor problem at the facility but poses no hazards to the public or to plant personnel.
The South Texas Project produces 2,700 megawatts of electricity and provides power to approximately two million Texas homes, according to an official statement. The plant is managed by STP Nuclear Operating Company and owned by Austin Energy, CPS Energy, and NRG Energy.
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