Talen Energy spokesman Todd Martin says the Martins Creek plant in Lower Mount Bethel Township has been taken off line while the company works with state regulators to investigate the fire. It was reported shortly after 7:30 p.m. Sunday and controlled about 90 minutes later.
Nobody was hurt and the company says there's no risk to the public. There are no reported outages or power shortfalls because the plant is not operating.
Witnesses reported hearing an explosion, but the company has yet to confirm the transformer exploded or how and why the fire may have started.
The plant is in Northampton County, about 70 miles north of Philadelphia.