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Planned Outage

Coal Conveyor Total Removal, Fabrication and Installment


Nooter Construction’s Industrial Power Group completed outage work at The Big Stone Plant during spring of 2015. The coal-fired power plant located in Big Stone City, South Dakota, generates capacity of 475 megawatts and serves over 120,000 customers in North Dakota, Minnesota, and South Dakota.


The project consisted of total removal, fabrication and installment of a 600 foot underground coal conveyor. Our millwrights removed and reinstalled a new coal rail car dumper which included new gearbox drum cables and rails. In addition, our boilermakers installed new studs in 12 cyclones, 12 new water wall soot blower openings, studded bottom half of boiler water walls, replaced steam drum cyclones and 8 duct work expansion joints, and removed and replaced boiler side wall casing. Our Pipefitters replaced turbine valve piping, steam exhaust and deaerator steam pipe and miscellaneous steam valves. The project also included temporarily supporting deaerator vessels, as well as removing and rebuilding deaerator floor structure beams and concrete floor.

Nooter was responsible for management and coordination of all aspects of the project to insure a successful outcome, within the schedule provided.


The project was completed on schedule, under budget, and with a stellar safety record.

“A project of this scope required a high level of coordination, careful attention to the budget and timely completion.  Nooter Construction met all of these requirements and ensured the project stayed within budget, stayed on schedule and everyone went home to their family safely. “

– Gary Wellnitz, Maintenance Engineer| Otter Tail Power Company