Construction on a new SO2 scrubber at the coal-fired Edgewater Unit 5 commenced on March 3 with site clearing and grubbing activities in preparation for excavation, said Wisconsin Power and Light in an April 25 project update filed at the Public Service Commission of Wisconsin.
In June 2013, the commission approved the application for a Certification of Authority to install a Dry Flue Gas Desulfurization System (DFGD) at Edgewater Unit 5. The estimated cost of the approved project was $413,710,000, excluding allowance for funds used during construction (AFUDC). As of this update, the project is currently forecasted to be completed for approximately $300,000,000, excluding AFUDC.
WP&L said it has a selected an unnamed Engineer-Procurement-Construction (EPC) bidder. This contractor’s scope includes providing the DFGD technology, a circulating fluidized bed (CFB). WP&L is in contract negotiations with the selected bidder.
WPL issued limited notices to proceed to the selected bidder, releasing the bidder to draft various construction related permits, including the Air Construction Permit; to execute the detail engineering and procurement activities necessary so that schedule can be kept; to mobilize to the site; and to begin construction activities required to maintain the schedule for the tie-in outage in May 2016.
Edgewater consists of three coal-fired units; Units 3, 4 and 5. These units began operation in 1951, 1969, and 1985, and have nameplate generation capacities of 60 MW, 330 MW, and 380 MW, respectively. While Unit 5 was previously jointly-owned by WP&L and Wisconsin Electric Power, Units 3 and 5 are currently owned exclusively by WP&L. Unit 4 is jointly-owned by WP&L and Wisconsin Public Service Corp. (WPSC). WP&L owns 68.2% and WPSC owns 31.8% of Unit 4. All three units are operated by WP&L.
Unit 5 currently utilizes sub-bituminous Powder River Basin coal obtained by WP&L from various mines.