Wisconsin Power and Light told the Wisconsin Public Service Commission in an April 26 update that construction began Feb. 29 on a Selective Catalytic Reduction (SCR) system for the coal-fired Columbia Unit 2, with the anticipated in-service date for the SCR being April 30, 2018.
In January 2015, the commission approved the application for a Certification of Authority to install an SCR system to reduce NOx emissions at Columbia Energy Center Unit 2. Construction under that order was commence no later than Jan. 30, 2016. But on Jan. 12, WPL filed a request with the commission for a five month extension to no later than June 30. On Jan. 22, the commission granted the requested extension.
Construction activities commenced on Feb. 29 with the replacement of existing expansion joints and installation of SCR inlet reinforcements.
The estimated cost of the approved project was $150,000,000, excluding AFUDC.
On Sept. 1, 2015, WPL signed a contract with GSL Columbia SCR Joint Venture (GSL) for EPC services. GSL is a joint venture between Graycor Industrial Constructors and Sargent & Lundy LLC. GSL subcontracted the SCR technology supply to Andritz Inc.
GSL commenced replacement of existing expansion joints and installation of SCR inlet reinforcement steel. This work is scheduled to be completed during the Unit 2 spring 2016 outage to minimize work required during the 2018 tie-in outage. GSL is also preparing for full mobilization during the second quarter of 2016. Other construction activities, specifically excavations for foundations, are scheduled to begin during the second quarter of 2016.
The Columbia Energy Center is located south of Portage, Wisconsin, along the Wisconsin River. The facility consists of two coal-fired units – Units 1 and 2. These units began operation in 1975 and 1978, and have nameplate generation capacities of 512 MW and 511 MW, respectively.