Item 2. Properties
ITEM 2. PROPERTIES
Alliant Energy - As a holding company, Alliant Energy doesn’t directly own any significant properties other than the stock of its subsidiaries. The principal properties of those subsidiaries are as follows:
IPL and WPL
Electric - At December 31, 2022, IPL’s and WPL’s facilities by primary fuel type were as follows:
IPL Generating
In-service Capacity
Name of Facility and Location Dates in MW (a)
Marshalltown Generating Station (Units 1-3); Marshalltown, IA 2017 528
Emery Generating Station (Units 1-3); Mason City, IA 2004 514
Burlington Generating Station (Unit 1); Burlington, IA 1968 162
Marshalltown Combustion Turbines (Units 1-3); Marshalltown, IA 1978 141
Prairie Creek Generating Station (Unit 4); Cedar Rapids, IA 1967 99
Burlington Combustion Turbines (Units 1-4); Burlington, IA 1994-1996 32
Total Gas 1,476
Upland Prairie (121 Units); Clay and Dickinson Cos., IA 2019 299
Whispering Willow - North (81 Units); Franklin Co., IA 2020 201
Whispering Willow - East (121 Units); Franklin Co., IA 2009 200
Golden Plains (82 Units); Winnebago and Kossuth Cos., IA 2020 200
English Farms (69 Units); Poweshiek Co., IA 2019 172
Richland (53 Units); Sac Co., IA 2020 131
Franklin County (60 Units); Franklin Co., IA 2012 99
Total Wind 1,302
Ottumwa Generating Station (Unit 1); Ottumwa, IA (b) 1981 309
Lansing Generating Station (Unit 4); Lansing, IA 1977 146
George Neal Generating Station (Unit 4); Sioux City, IA (c) 1979 158
George Neal Generating Station (Unit 3); Sioux City, IA (d) 1975 137
Prairie Creek Generating Station (Units 1 and 3); Cedar Rapids, IA 1958-1997 31
Louisa Generating Station (Unit 1); Louisa, IA (e) 1983 29
Total Coal 810
Lime Creek Combustion Turbines (Units 1-2); Mason City, IA 1991 63
Total Oil 63
Dubuque Solar Facility; Dubuque, IA 2017 5
Marshalltown Solar Facility; Marshalltown, IA 2020 3
Total Solar 8
Battery Storage; Decorah, Wellman and Marshalltown, IA 2019-2021 4
Total Battery Storage 4
Total capacity 3,663
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Table of Co ntents
WPL Generating
In-service Capacity
Name of Facility and Location Dates in MW (a)
Riverside Energy Center (Units 1-3); Beloit, WI 2004 438
West Riverside Energy Center (Units 1-3); Beloit, WI (f) 2020 436
Neenah Energy Facility (Units 1-2); Neenah, WI 2000 289
South Fond du Lac Combustion Turbines (2 Units); Fond du Lac, WI (g) 1994 162
Total Gas 1,325
Bent Tree (122 Units); Freeborn Co., MN 2010-2011 201
Kossuth (56 Units); Kossuth Co., IA 2020 152
Cedar Ridge (41 Units); Fond du Lac Co., WI 2008 68
Forward Wind Energy Center (37 Units); Dodge and Fond du Lac Cos., WI (h) 2008 59
Total Wind 480
Columbia Energy Center (Units 1-2); Portage, WI (i) 1975-1978 584
Edgewater Generating Station (Unit 5); Sheboygan, WI 1985 356
Total Coal 940
Wood County Solar Facility, Wood Co., WI 2022 150
Bear Creek Solar Facility, Richland Co., WI 2022 50
North Rock Solar Facility, Rock Co., WI 2022 50
West Riverside Solar Facility, Beloit, WI (j) 2021 4
Customer- and Community-hosted Solar; various locations in WI 2021-2022 4
Total Solar 258
Prairie du Sac Hydro Plant (8 Units); Prairie due Sac, WI 1914-1940 13
Kilbourn Hydro Plant (4 Units); Wisconsin Dells, WI 1926-1939 6
Total Hydro 19
Battery Storage; Portage, WI 2022 5
Total Battery Storage 5
Total capacity 3,027
(a) Based on the accredited generating capacity included in MISO’s resource adequacy process for the planning period from June 2022 through May 2023, except for wind facilities, solar facilities and battery storage, which are based on nameplate capacity.
(b) Represents IPL’s 48% ownership interest, which is operated by IPL.
(c) Represents IPL’s 25.695% ownership interest, which is operated by MidAmerican Energy Company.
(d) Represents IPL’s 28% ownership interest, which is operated by MidAmerican Energy Company.
(e) Represents IPL’s 4% ownership interest, which is operated by MidAmerican Energy Company.
(f) Represents WPL’s 91% ownership interest, which is operated by WPL.
(g) Represents Units 2 and 3, which WPL owns. WPL also operates, but does not own, South Fond du Lac Combustion Turbines Units 1 and 4.
(h) Represents WPL’s 42.64% ownership interest, which is operated by Invenergy Services, LLC.
(i) Represents WPL’s 53.5% ownership interest, which is operated by WPL.
(j) Represents WPL’s 91% ownership interest, which is operated by WPL.
IPL and WPL own overhead electric distribution line, underground electric distribution cable and substation distribution transformers, substantially all of which are located in Iowa for IPL and Wisconsin for WPL.
Gas - IPL’s and WPL’s gas properties consist primarily of mains and services, meters, regulating and gate stations and other related transmission and distribution equipment. IPL’s and WPL’s gas distribution facilities include gas mains located in Iowa and Wisconsin, respectively.
Other - IPL’s other property includes steam service assets. Refer to Note 10 for information regarding WPL’s lease of the Sheboygan Falls Energy Facility from AEF’s Non-utility Generation business.
Corporate Services - Corporate Services’ property included in “Property, plant and equipment, net” on Alliant Energy’s balance sheet at December 31, 2022 consisted primarily of a customer billing and information system for IPL and WPL and other computer software, and the corporate headquarters building located in Madison, Wisconsin.
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Table of Co ntents
AEF - AEF’s principal properties included in “Property, plant and equipment, net” on Alliant Energy’s balance sheet at December 31, 2022 were as follows:
Non-utility Generation - Includes the Sheboygan Falls Energy Facility, a 347 MW, simple-cycle, natural gas-fired facility near Sheboygan Falls, Wisconsin that was placed in service in 2005 and is leased to WPL. The Sheboygan Falls Energy Facility was accredited with 291 MW of generating capacity for MISO’s resource adequacy process for the planning period from June 2022 through May 2023.
Travero - Includes a short-line rail freight service in Iowa; a Mississippi River barge, rail and truck freight terminal in Illinois; and a rail-served warehouse in Iowa.