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Edgewater Unit 5 AQCS

The $200+ million AQCS project at Edgewater Station added two dry flue gas desulphurization trains at Unit 5. Owned and operated by Alliant Energy’s Wisconsin utility, Wisconsin Power and Light, the 430 MW pulverized coal plant is located on Lake Michigan in Sheboygan, Wisconsin.

After Construction/After Construction

Unit 5’s unique turndown capabilities allow it to ramp up from minimum load (60 MW) to maximum load (385 to 430 MW) very quickly. Because of this flexibility, it has been able to operate economically within the demands of the current power market. The addition of a scrubber and bag house system can limit this degree of flexibility. However, the technology used on this AQCS project was structured and delivered in a manner that does not constrain its flexibility AND allows it to meet emissions requirements at all times – low loads, maximum capacity and when ramping up and down.


Video Highlights




Compact & Efficient Design for Extremely Narrow Lake Michigan Site. The hydrator and electrical control buildings have been positioned underneath the scrubber and baghouse to reduce the project footprint. This allows staff to efficiently monitor equipment and provides a weather enclosure for hardware, operation, and maintenance.


About the Plant

  • Located in Sheboygan, Wisconsin
  • 430 MW pulverized coal plant began operation in 1985
  • Owned and operated by Alliant Energy’s Wisconsin utility, Wisconsin Power & Light
  • WPL provides power to 460,000 customers and natural gas to 180,000 in Wisconsin

About the Project

  • EPC contract
  • AQCS project to install two dry flue gas desulphurization (DFGD) trains
    • 2014 - Construction began
    • Spring 2016 - Commissioning
    • Feb. 2017 to July 2017 - Testing
  • Reduces SO2 emissions by 15 million pounds per year
  • Reduces particulate matter emissions by 120,000 pounds per year
  • $200+ million project
  • Created 300 jobs at the project peak
  • No lost time injuries

Additional Photos

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