Duke Energy invests $400 million in pollution control

Selective Catalytic Reduction Systems reduce nitrogen oxide and mercury at Duke Energy's Cayuga coal plant, meeting MATS rules with SCR and dry sorbent injection, improving pollution control and air quality while supporting Indiana jobs.

With a population of just under 1,200, Cayuga, just north of Terre Haute near the Illinois border, is generally a quiet town. There's more activity these days, though, as a small army of construction workers add new pollution control equipment to Duke Energy's coal-fired Cayuga power plant.

As many as 300 construction workers, mostly from west central and southern Indiana, are building 200-foot structures called selective catalytic reduction systems. The equipment changes mercury into a substance the plant's other pollution control equipment can better capture.

The project is the largest investment in Duke Energy's Indiana compliance plan, as noted in an update for IGCC plant filing, for the federally mandated Mercury and Air Toxics Standard. The equipment will go into service in late 2014 for Unit 1 and mid-2015 for Unit 2.

To date, Duke Energy has allocated $124 million for Indiana-based vendors and contractors. The overall project will cost about $400 million, according to a recent cost update from the company, which includes costs of the two selective catalytic reduction units as well as dry sorbent injection systems for additional mercury removal and sulfur trioxide mitigation.

"It's been an economic boost for Indiana, for both the Hoosier companies doing the construction work as well as the regional businesses providing food, lodging, gas and other services to the construction workers," said Cayuga Plant Manager Michael Wertz. "When a project like this happens, there's a ripple effect throughout the regional economy."

The equipment also prepares the company for anticipated tougher, future federal requirements, similar to the maximum controls at Cliffside adopted elsewhere, limiting nitrogen oxide, a contributor to ozone, and fine particulates. The selective catalytic reduction structures act like the catalytic converters in cars to reduce smog-forming nitrogen oxide emissions. The equipment can remove about 6,000 tons of nitrogen oxide emissions annually, the equivalent of taking roughly 316,000 cars off the road.

"The vast majority of our state's electric power is fueled by coal, but tightening federal environmental regulations mean we must find cleaner ways of using it," said Duke Energy Indiana President Doug Esamann. "This investment allows us to continue using an abundant local resource at Cayuga."

In 2008, the company invested approximately $500 million for two scrubbers to control sulfur dioxide emissions at Cayuga, even as an Indiana coal project cost estimate rose elsewhere.

Statewide, Duke Energy has invested approximately $2.8 billion since 1990, while new coal plant costs climbed elsewhere, in federally mandated pollution control measures.

As a result, the company's Indiana emissions of sulfur dioxide, nitrogen oxide, particulates and other pollutants have decreased dramatically, even as customer demands and power generation have increased, and an Indiana coal-to-gas project bucks industry trends in the region.

Since 1990, sulfur dioxide emissions have decreased by more than 84 percent and nitrogen oxide by more than 73 percent through the installation of pollution control equipment, the use of lower-sulfur fuel, and increased fuel diversity in the company's generation mix, including a coal-to-gas plant effort today. Duke Energy also has achieved significant mercury reductions from these efforts.

More information and a photo of Cayuga power plant is available at this link: http://www.duke-energy.com/power-plants/coal-fired/cayuga.asp. Duke Energy Indiana's operations provide approximately 6,900 megawatts of owned electric capacity to approximately 790,000 customers, making it the state's largest electric supplier.

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