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, 2021, IPL’s and WPL’s facilities by primary fuel type were as follows:
IPL Nameplate Generating
In-service Capacity Capacity
Name of Facility and Location Dates in MW in MW (a)
Marshalltown Generating Station (Units 1-3); Marshalltown, IA 2017 706 625
Emery Generating Station (Units 1-3); Mason City, IA 2004 603 532
Burlington Generating Station (Unit 1); Burlington, IA 1968 212 167
Marshalltown Combustion Turbines (Units 1-3); Marshalltown, IA 1978 189 144
Prairie Creek Generating Station (Unit 4); Cedar Rapids, IA 1967 149 113
Burlington Combustion Turbines (Units 1-4); Burlington, IA 1994-1996 79 35
Total Gas 1,938 1,616
Upland Prairie (121 Units); Clay and Dickinson Cos., IA 2019 299 89
Whispering Willow - North (81 Units); Franklin Co., IA 2020 201 36
Whispering Willow - East (121 Units); Franklin Co., IA 2009 200 28
Golden Plains (82 Units); Winnebago and Kossuth Cos., IA 2020 200 33
English Farms (69 Units); Poweshiek Co., IA 2019 172 27
Richland (53 Units); Sac Co., IA 2020 131 21
Franklin County (60 Units); Franklin Co., IA 2012 99 14
Total Wind 1,302 248
Ottumwa Generating Station (Unit 1); Ottumwa, IA (b) 1981 348 315
Lansing Generating Station (Unit 4); Lansing, IA 1977 275 206
George Neal Generating Station (Unit 4); Sioux City, IA (c) 1979 179 157
George Neal Generating Station (Unit 3); Sioux City, IA (d) 1975 164 140
Prairie Creek Generating Station (Units 1 and 3); Cedar Rapids, IA 1958-1997 65 29
Louisa Generating Station (Unit 1); Louisa, IA (e) 1983 32 28
Total Coal 1,063 875
Lime Creek Combustion Turbines (Units 1-2); Mason City, IA 1991 90 66
Total Oil 90 66
Dubuque Solar Garden; Dubuque, IA 2017 5 2
Marshalltown Solar Garden; Marshalltown, IA 2020 3 1
Total Solar 8 3
Battery Storage; Decorah, Wellman and Marshalltown, IA 2019-2021 4 —
Total Battery Storage 4 —
Total capacity 4,405 2,808
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WPL Nameplate Generating
In-service Capacity Capacity
Name of Facility and Location Dates in MW in MW (a)
Riverside Energy Center (Units 1-3); Beloit, WI 2004 675 503
West Riverside Energy Center (Units 1-3); Beloit, WI (f) 2020 658 595
Neenah Energy Facility (Units 1-2); Neenah, WI 2000 371 294
South Fond du Lac Combustion Turbines (2 Units); Fond du Lac, WI (g) 1994 191 161
Total Gas 1,895 1,553
Bent Tree (122 Units); Freeborn Co., MN 2010-2011 201 26
Kossuth (56 Units); Kossuth Co., IA 2020 152 25
Cedar Ridge (41 Units); Fond du Lac Co., WI 2008 68 8
Forward Wind Energy Center (37 Units); Dodge and Fond du Lac Cos., WI (h) 2008 59 7
Total Wind 480 66
Columbia Energy Center (Units 1-2); Portage, WI (i) 1975-1978 595 585
Edgewater Generating Station (Unit 5); Sheboygan, WI 1985 414 397
Total Coal 1,009 982
Prairie du Sac Hydro Plant (8 Units); Prairie due Sac, WI 1914-1940 33 12
Kilbourn Hydro Plant (4 Units); Wisconsin Dells, WI 1926-1939 10 6
Total Hydro 43 18
West Riverside Solar Garden, Beloit, WI (j) 2021 4 —
Total Solar 4 —
Total capacity 3,431 2,619
(a) Based on the accredited generating capacity of the EGUs as of December 31, 2021 included in MISO’s resource adequacy process for the planning period from June 2021 through May 2022. IPL’s Battery Storage did not receive any accredited generating capacity for the planning period from June 2021 through May 2022. Electricity generated from the West Riverside Solar Garden is used to offset electricity usage at the West Riverside Energy Center and does not receive any accredited generating capacity.
(b) Represents IPL’s 48% ownership interest in this 726 MW (nameplate capacity) / 656 MW (generating capacity) EGU, which is operated by IPL.
(c) Represents IPL’s 25.695% ownership interest in this 696 MW (nameplate capacity) / 610 MW (generating capacity) EGU, which is operated by MidAmerican Energy Company.
(d) Represents IPL’s 28% ownership interest in this 584 MW (nameplate capacity) / 501 MW (generating capacity) EGU, which is operated by MidAmerican Energy Company.
(e) Represents IPL’s 4% ownership interest in this 812 MW (nameplate capacity) / 708 MW (generating capacity) EGU, which is operated by MidAmerican Energy Company.
(f) Represents WPL’s 91% ownership interest in this 723 MW (nameplate capacity) / 654 MW (generating capacity) EGU, 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 in this 138 MW (nameplate capacity) / 17 MW (generating capacity) EGU, which is operated by Invenergy Services, LLC.
(i) Represents WPL’s 53.5% ownership interest in this 1,112 MW (nameplate capacity) / 1,093 MW (generating capacity) EGU, which is operated by WPL.
(j) Represents WPL’s 91% ownership interest in this 4 MW (nameplate capacity) EGU, 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, 2021 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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AEF - AEF’s principal properties included in “Property, plant and equipment, net” on Alliant Energy’s balance sheet at December 31, 2021 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 295 MW of generating capacity for MISO’s resource adequacy process for the planning period from June 2021 through May 2022.
Travero - Includes a short-line rail freight service in Iowa; a Mississippi River barge, rail and truck freight terminal in Illinois; freight brokerage services; and a rail-served warehouse in Iowa, which began operations in 2021.