Magna IV Engineering’s Denver team recently did an extensive job for the facility involving a 15-kV bushing swap. The process called for draining the oil level of about 300 gallons to reach the bushing level, swapping the bushing by climbing right into the tank, and refilling the transformer.

The Colstrip power plant, east of Billings, Montana first came online in 1976, and operates four coal-fired generating units capable of producing up to 2,094MW of electricity. The upgrade of an existing transformer bank was required to continue the safe and reliable operation.

Magna IV Engineering was engaged to complete a study of the grounding system that spans more than 550 acres, a vastly larger footprint than a utility substation.