AQCS Retrofit - Ottumwa Generating Station

Client: Alliant Energy
Completion Date: 2014
Location: Ottumwa, Iowa


Burns & McDonnell is providing engineering, procurement and construction services to Alliant Energy with a construction joint venture partner, Babcock & Wilcox Construction Co. Inc. for a semi-dry flue gas desulfurization (FGD) and baghouse retrofit to the nominal 720 megawatt (MW) Ottumwa Generating Station. Burns & McDonnell completed the Phase I services including project development, cost estimating, scheduling, conceptual design, permitting support and major equipment specification development. The unit is a jointly owned unit with Alliant Energy (Interstate Power & Light Company) and MidAmerican Energy.


  • Preliminary engineering
  • Permitting support
  • Ancillary project definition
  • Detailed design
  • Procurement
  • Construction
  • Startup


Burns & McDonnell completed the Phase I services for the project and the BWM joint venture is proceeding with detailed design engineering, procurement and project construction, with anticipated commercial operation in 2014. In addition, BWM is supporting Alliant Energy in technical and economic review of several ancillary projects at the site in parallel with the AQCS retrofit. The Ottumwa Generating Station scrubber/baghouse project is anticipated to include the addition of pulse-jet fabric filters (PJFF) with an upgraded ash handling system compatible with the PJFF. The Phase II work includes all necessary design, demolition, procurement, construction, erection, controls and auxiliary equipment for a complete multicompartment PJFF system.

In addition, the plant will be retrofitted with a new semi-dry lime FGD system. As part of the Phase I effort, Burns & McDonnell performed a technology review of the dry FGD systems. The semi-dry FGD system retrofit will also include lime unloading and storage systems, lime slurry preparation and handling systems, waste ash systems, recycle ash systems, new fans, new ductwork, and ductwork modifications surrounding the existing hot side electrostatic precipitator.


  • Pulse-jet fabric filters
  • New induced draft (ID) fans
  • Ash handling system
  • Dry lime FGD system