Alliant Energy (NYSE: LNT) reported in its Aug. 2 quarterly Form 10-Q filing with the SEC that its Wisconsin Power and Light (WPL) and Interstate Power and Light (IPL) subsidiaries are making progress with cleaning up coal-fired emissions under consent decrees worked out earlier this decade.
In 2013, the U.S. District Court for the Western District of Wisconsin approved a Consent Decree that WPL, along with the other owners of the Edgewater and Columbia coal plants, entered into with the EPA and the Sierra Club, thereby resolving claims against WPL. Such claims included allegations that the owners of Edgewater, Nelson Dewey and Columbia violated the Prevention of Significant Deterioration program requirements, Title V Operating Permit requirements of the CAA and the Wisconsin State Implementation Plan designed to implement the Clean Air Act.
WPL has completed various requirements under the Consent Decree. Construction of a scrubber and baghouse at Edgewater Unit 5 was completed in July 2016. Its remaining requirements include installing a selective catalytic reduction (SCR) system for NOx control at Columbia Unit 2 by Dec. 31, 2018. WPL is also required to fuel switch or retire the coal-fired Edgewater Unit 4 by Dec. 31, 2018. In addition, the Consent Decree establishes emission rate limits for SO2, NOx and particulate matter for Columbia Units 1 and 2, and Edgewater Units 4 and 5. The Consent Decree also includes annual plant-wide emission caps for SO2 and NOx for Columbia and Edgewater. WPL is in the process of completing approximately $7 million in environmental mitigation projects.
In 2015, the U.S. District Court for the Northern District of Iowa approved a Consent Decree that IPL entered into with the EPA, the Sierra Club, the State of Iowa and Linn County in Iowa, thereby resolving potential CAA issues associated with emissions from IPL’s coal-fired generating facilities in Iowa.
IPL has completed various requirements under the Consent Decree. IPL’s remaining requirements include: installing an SCR or equivalent NOx reduction system at the Ottumwa Generating Station by Dec. 31, 2019; fuel switching or retiring Prairie Creek Unit 4 by June 1, 2018, the Burlington Generating Station by Dec. 31, 2021, and Prairie Creek Units 1 and 3 by Dec. 31, 2025; and either installing combined cycle technology at, or retiring, the Dubuque and Sutherland Generating Stations by June 1, 2019.
The Consent Decree with IPL also establishes SO2, NOx and particulate matter emission rate limits with varying averaging times for the Burlington, Lansing, M.L. Kapp, Ottumwa and Prairie Creek Generating Stations. In addition, the Consent Decree includes calendar-year SO2 and NOx emission caps for the Prairie Creek Generating Station, and calendar-year SO2 and NOx emission caps in aggregate for the Burlington, Dubuque, Lansing, M.L. Kapp, Ottumwa, Prairie Creek and Sutherland Generating Stations. IPL will also complete approximately $6 million in environmental mitigation projects.