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Condensed Parent Company Financial Statements | 12 Months Ended
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Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract] |
Condensed Parent Company Financial Statements | SCHEDULE I - CONDENSED PARENT COMPANY FINANCIAL STATEMENTS
ALLIANT ENERGY CORPORATION (Parent Company Only) | Year Ended December 31,
CONDENSED STATEMENTS OF INCOME | 2023 |  | 2022 |  | 2021
| (in millions)
Operating expenses | $3 |  |  | $9 |  |  | $5 |
Operating loss | (3) |  |  | (9) |  |  | (5) |
Other (income) and deductions: |  |  |  |  |
Equity earnings from consolidated subsidiaries | (742) |  |  | (707) |  |  | (664) |
Interest expense | 34 |  |  | 6 |  |  | 1 |
Other | 4 |  |  | 1 |  |  | 1 |
Total other (income) and deductions | (704) |  |  | (700) |  |  | (662) |
Income before income taxes | 701 |  |  | 691 |  |  | 657 |
Income tax expense (benefit) | (5) |  |  | 2 |  |  | (5) |
Net income | $706 |  |  | $689 |  |  | $662 |
Refer to accompanying Notes to Condensed Financial Statements.
ALLIANT ENERGY CORPORATION (Parent Company Only) | December 31,
CONDENSED BALANCE SHEETS | 2023 |  | 2022
| (in millions)
ASSETS |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies | $96 |  |  | $65 |
Other | 1 |  |  | 1 |
Total current assets | 97 |  |  | 66 |
Investments: |  |  |
Investments in consolidated subsidiaries | 8,405 |  |  | 7,801 |
Other | 2 |  |  | 2 |
Total investments | 8,407 |  |  | 7,803 |
Other assets | 90 |  |  | 97 |
Total assets | $8,594 |  |  | $7,966 |
LIABILITIES AND EQUITY |  |  |
Current liabilities: |  |  |
Commercial paper | $157 |  |  | $352 |
Notes payable to affiliated companies | 1,068 |  |  | 1,318 |
Other | 10 |  |  | 10 |
Total current liabilities | 1,235 |  |  | 1,680 |
Long-term debt, net | 568 |  |  | — |
Other liabilities | 2 |  |  | 1 |
Common equity: |  |  |
Common stock and additional paid-in capital | 3,033 |  |  | 2,780 |
Retained earnings | 3,768 |  |  | 3,518 |
Accumulated other comprehensive income | 1 |  |  | — |
Shares in deferred compensation trust | (13) |  |  | (13) |
Total common equity | 6,789 |  |  | 6,285 |
Total liabilities and equity | $8,594 |  |  | $7,966 |
Refer to accompanying Notes to Condensed Financial Statements.
ALLIANT ENERGY CORPORATION (Parent Company Only) | Year Ended December 31,
CONDENSED STATEMENTS OF CASH FLOWS | 2023 |  | 2022 |  | 2021
| (in millions)
Net cash flows from operating activities | $445 |  |  | $492 |  |  | $494 |
Cash flows used for investing activities: |  |  |  |  |
Capital contributions to consolidated subsidiaries | (325) |  |  | (530) |  |  | (295) |
Net change in notes receivable from and payable to affiliates | (281) |  |  | 369 |  |  | (21) |
Dividends from consolidated subsidiaries in excess of equity earnings | — |  |  | — |  |  | 50 |
Net cash flows used for investing activities | (606) |  |  | (161) |  |  | (266) |
Cash flows from (used for) financing activities: |  |  |  |  |
Common stock dividends | (456) |  |  | (428) |  |  | (403) |
Proceeds from issuance of common stock, net | 246 |  |  | 25 |  |  | 28 |
Proceeds from issuance of long-term debt | 565 |  |  | — |  |  | — |
Net change in commercial paper | (195) |  |  | 73 |  |  | 147 |
Other | 1 |  |  | (1) |  |  | — |
Net cash flows from (used for) financing activities | 161 |  |  | (331) |  |  | (228) |
Net increase (decrease) in cash, cash equivalents and restricted cash | — |  |  | — |  |  | — |
Cash, cash equivalents and restricted cash at beginning of period | — |  |  | — |  |  | — |
Cash, cash equivalents and restricted cash at end of period | $— |  |  | $— |  |  | $— |
Supplemental cash flows information: |  |  |  |  |
Cash (paid) refunded during the period for: |  |  |  |  |
Interest | ($27) |  |  | ($6) |  |  | ($1) |
Income taxes, net | $22 |  |  | $15 |  |  | $4 |
Refer to accompanying Notes to Condensed Financial Statements. ALLIANT ENERGY CORPORATION (Parent Company Only) NOTES TO CONDENSED FINANCIAL STATEMENTS Pursuant to rules and regulations of the SEC, the Condensed Financial Statements of Alliant Energy Corporation (Parent Company Only) do not reflect all of the information and notes normally included with financial statements prepared in accordance with GAAP. Therefore, these Condensed Financial Statements should be read in conjunction with the Financial Statements and related Notes included in the combined 2023 Form 10-K, Part II, Item 8, which is incorporated herein by reference. In the Condensed Financial Statements of Alliant Energy Corporation (Parent Company Only), investments in subsidiaries are accounted for using the equity method.

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- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 205 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04(Schedule I)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480922/205-10-S99-6 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481231/810-10-45-11 + Details
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