A RESPONSIBLE RETROFIT

The Big Stone Plant air-quality control system (AQCS) balances our commitments to cost-effective service and environmental responsibility. The new system components will reduce nitrogen oxide, sulfur dioxide, particulate matter, and mercury by about 90 percent. The retrofit enables us to responsibly generate base-load electricity from coal at Big Stone Plant.

PARTS OF THE AQCS

Selective Catalytic Reduction (SCR): Converts nitrogen oxide (smog) into water vapor and breathable nitrogen (N2) and will reduce emissions from 0.7 pounds per million BTU of fuel to 0.1.

Dry Scrubber: Targets sulfur dioxide (acid rain) and turns it into fly ash, which we will safely store in our ash disposal site. The dry scrubber will reduce sulfur dioxide emissions from 0.75 pounds per million BTU of fuel to 0.09.

Baghouse: One of the most efficient and cost-effective filtration systems for separating dust particles from gases.

AQCS AT A GLANCE

    Construction-phase completion: 2015
    Project completion: 2016
    Jobs: Almost 600
    Budget: $384 million
    Regional economic impact: $130 million in payroll plus $10 million in supplies purchased locally

TRULY GROUNDBREAKING

On April 26, 2013, the three companies that own Big Stone Plant—Otter Tail Power Company, Montana-Dakota Utilities Co., and NorthWestern Energy—held a groundbreaking ceremony for this project.

 

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