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2017 Keystone Award
Project of the Year 

AGC Missouri

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Power Engineering

Highly Collaborative Partnering Spells Success for AQCS Project

The $200+ million Air Quality Control System (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.

At first glance this Engineer Procure Construct (EPC) project looks like a standard scrubber and baghouse system, but a second look reveals how it stands head and shoulders above the competition in areas important to the owner and energy customer. 

EPC projects are not known for encouraging communication and collaboration but rather as a way for the contractor to keep the owner at arm’s length.  This project flipped that notion on its head, replacing a cold shoulder with a warm handshake.  Partnering, proactive communication and collaboration between Alliant Energy, JV partners Alberici Construction and Stanley Consultants, and vendors created a harmonious atmosphere.  The result was a highly successful project with very few change orders, completed ahead of schedule and under budget.

Unit 5’s extreme turndown capabilities allow it to operate efficiently from 430 MW gross to its minimum load of 60 MW gross.  Because of this turndown capability and its ability to not limit the unit’s ramp rate, it has been able to operate economically within the demands of the current power market. The addition of a traditional scrubber and bag house system could have limited this degree of flexibility.  However, the technology was structured and delivered in a manner that does not constrain the unit’s flexibility and allows it to meet emissions requirements at all times – low loads, maximum capacity and when ramping up and down.  This extreme range provides more flexibility to accommodate renewables, the distributed power grid and market requirements.