Environmental Stewardship

IMPA and its generating partners have always been at the forefront of technology designed to protect and preserve the environment while providing an economic and reliable power supply.
IMPA has invested $130 million in environmental controls and improvements to Prairie State and Trimble County Unit 2.  The following is a description of environmental control systems at each of IMPA's generation facilities. 
Gibson Station Unit 5:
  • Precipitator to remove particulate matter
  • Scrubber to remove sulfur dioxide
  • Low nitrogen oxide (NOx) burner to reduce NOx emissions
  • Selective Catalytic Reduction (SCR) systems to further reduce emissions

Trimble County Unit 1:
  • Precipitator for particulate matter removal
  • Scrubber to remove sulfur dioxide
  • Low NOx burner to reduce emissions
  • SCR system to further reduce emissions

Trimble County Unit 2:
  • SCR for NOx emissions reduction
  • Dry electrostatic precipitator for particulate removal
  • Wet electrostatic precipitator for fine particulate removal
  • Baghouse for particulate removal
  • Wet flue gas desulfurization system for SO2 removal
Prairie State Energy Campus:
  • SCR for NOx emissions reduction
  • Dry electrostatic precipitator for particulate reduction
  • Wet flue gas desulfurization system for SO2 reduction
  • Wet electrostatic precipitator for fine particulate reduction
While each of IMPA’s generating stations possesses state-of-the-art technology designed to limit emissions from the units, several generating plants go above and beyond environmental regulations to further protect and enhance the environment around them.
At Gibson Station in Southern Indiana, IMPA and its co-owners maintain a 2,950-acre man-made lake to provide cooling water to the plant. Adjacent to the lake is the 463-acre Cane Ridge Wildlife Area, which includes a 60-acre nesting unit for the endangered Interior Least Tern, a 193-acre moist soil management habitat, and a 173-acre area filled with 89,000 bottomland hardwood trees. Walking trails through the wildlife area provide visitors with the opportunity to view both waterfowl and other wildlife. The area has been recognized as being one of the most successful conservation efforts in the Midwest.
Trimble County Station in Northern Kentucky boasts its share of environmental improvements as well.  IMPA and its co-owners at the station have set aside a 114-acre wildlife preserve, consisting of wetlands and forested areas. In cooperation with the Kentucky Department of Fish and Wildlife and the Louisville Zoo, the station participates in the Peregrine Falcon Restoration program to provide nesting boxes on the plant’s stack. Over time, this successful program has helped to remove the peregrine falcon from the endangered species list. The Trimble County Station also recycles fly ash, scrubber sludge and bottom ash, which are all byproducts of electric generation. The fly ash is used to produce a concrete mix that is sold to the construction industry. Gypsum is produced from scrubber sludge and is used in the manufacture of wallboard for the home construction industry. Bottom ash is used to produce abrasives and roofing shingles.

At the Prairie State Energy Campus, the Agency invested in state-of-the-art emissions control technologies that will limit emissions while generating low-cost, reliable electricity. The Prairie State Energy Campus utilizes environmental technologies to achieve emissions that are one-fifth of the regulated rates for U.S. plants.

Additionally, IMPA continually explores opportunities to add environmentally-friendly resources to its power supply portfolio.  Since 2014, IMPA has constructed solar parks in many of its member communities.  Currently, 12 IMPA member communities boast solar parks ranges in size from .25 MW to 4 MW.  These environmentally-responsible parks are the first solar resources to be added to IMPA's portfolio, althought certainly not the last.  The Agency has already begun construction on several other solar parks throughout the state.
Related Links:
11610 North College Avenue
Carmel, Indiana 46032
317-573-9955    317-575-3372 (fax)
1-800-826-IMPA    info@impa.com

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