What changed in this filing

/stocks — the workspaceLOADING

Item 2. Properties

2023-02-24 compared with 2022-02-18 · 30 added, 24 removed, 95 unchanged (36% of the section changed)

2 unchanged sentences

Electric - At December 31, 2022, 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)

IPL Generating

In-service Capacity

Name of Facility and Location Dates in MW (a)

Marshalltown Generating Station (Units 1-3);

41 unchanged sentences

Mason City, IA 1991 63

Total Oil 90 66

Dubuque Solar Garden;

Dubuque Solar Facility;

Dubuque, IA 2017 5

Marshalltown Solar Garden;

Marshalltown Solar Facility;

Marshalltown, IA 2020 3

4 unchanged sentences

Total capacity 3,663

WPL Nameplate Generating

In-service Capacity Capacity

Name of Facility and Location Dates in MW in MW (a)

Table of Co ntents

WPL Generating

In-service Capacity

Name of Facility and Location Dates in MW (a)

Riverside Energy Center (Units 1-3);

21 unchanged sentences

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);

3 unchanged sentences

Total Hydro 19

West Riverside Solar Garden, Beloit, WI (j) 2021 4 —

Total Solar 4 —

Battery Storage;

Portage, WI 2022 5

Total Battery Storage 5

Total capacity 3,027

(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.

(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.

(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 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.

(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.

4 unchanged sentences

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.

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:

3 unchanged sentences

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.

and a rail-served warehouse in Iowa.

Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.

What changed 10-K

Item 2. Properties