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Sherman County director of emergency services Dana Pursley-Haner said the fire in the city of Grass Valley injured at least five people, including two critically.
The utility said that although the substation was operational, power had only been restored in extension three due to vandalism damaging the switching station.
The fire also led to high levels of carbon monoxide inside the substation and power outages in the neighborhood.
Authorities expect a massive fire at an electrical substation south of Sydney to burn for days after a transformer at the facility caught alight on Saturday afternoon.
A statement about a City Power substation being on fire and affecting water supply is fake, Johannesburg's water utility announced on Sunday.