XML 28 R9.htm IDEA: XBRL DOCUMENT
v3.23.3

Receivables | 9 Months Ended
--- | ---
Sep. 30, 2023
Receivables [Line Items] |
Receivables | RECEIVABLES NOTE 4(a) - Accounts Receivable - For the three and nine months ended September 30, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable were as follows (in millions):
| Originated in 2022 |  | Originated in 2023
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
Alliant Energy | $3 |  | $11 |  | $6 |  | $8
IPL | 2 |  | 7 |  | 4 |  | 5
WPL | 1 |  | 4 |  | 2 |  | 3
NOTE 4(b) - Sales of Accounts Receivable - IPL maintains a Receivables Purchase and Sale Agreement (Receivables Agreement) whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. In March 2023, IPL amended and extended through March 2024 the purchase commitment from the third party to which it sells its receivables. The limit on cash proceeds fluctuates between $5 million and $110 million, which IPL may change periodically throughout the year. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. As of September 30, 2023, IPL had $109 million of available capacity under its sales of accounts receivable program. IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Maximum outstanding aggregate cash proceeds | $94 |  | $36 |  | $110 |  | $66
Average outstanding aggregate cash proceeds | 46 |  | 3 |  | 68 |  | 8
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| September 30, 2023 |  | December 31, 2022
Customer accounts receivable | $161 |  | $145
Unbilled utility revenues | 88 |  | 132
Other receivables | 1 |  | —
Receivables sold to third party | 250 |  | 277
Less: cash proceeds | 1 |  | 80
Deferred proceeds | 249 |  | 197
Less: allowance for expected credit losses | 13 |  | 12
Fair value of deferred proceeds | $236 |  | $185
As of September 30, 2023, outstanding receivables past due under the Receivables Agreement were $18 million. Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Collections | $616 |  | $670 |  | $1,720 |  | $1,731
Write-offs, net of recoveries | 5 |  | 3 |  | 9 |  | 6
Effective October 2023, the limit on cash proceeds under the Receivables Agreement is $5 million.
IPL [Member] |
Receivables [Line Items] |
Receivables | RECEIVABLES NOTE 4(a) - Accounts Receivable - For the three and nine months ended September 30, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable were as follows (in millions):
| Originated in 2022 |  | Originated in 2023
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
Alliant Energy | $3 |  | $11 |  | $6 |  | $8
IPL | 2 |  | 7 |  | 4 |  | 5
WPL | 1 |  | 4 |  | 2 |  | 3
NOTE 4(b) - Sales of Accounts Receivable - IPL maintains a Receivables Purchase and Sale Agreement (Receivables Agreement) whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. In March 2023, IPL amended and extended through March 2024 the purchase commitment from the third party to which it sells its receivables. The limit on cash proceeds fluctuates between $5 million and $110 million, which IPL may change periodically throughout the year. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. As of September 30, 2023, IPL had $109 million of available capacity under its sales of accounts receivable program. IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Maximum outstanding aggregate cash proceeds | $94 |  | $36 |  | $110 |  | $66
Average outstanding aggregate cash proceeds | 46 |  | 3 |  | 68 |  | 8
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| September 30, 2023 |  | December 31, 2022
Customer accounts receivable | $161 |  | $145
Unbilled utility revenues | 88 |  | 132
Other receivables | 1 |  | —
Receivables sold to third party | 250 |  | 277
Less: cash proceeds | 1 |  | 80
Deferred proceeds | 249 |  | 197
Less: allowance for expected credit losses | 13 |  | 12
Fair value of deferred proceeds | $236 |  | $185
As of September 30, 2023, outstanding receivables past due under the Receivables Agreement were $18 million. Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Collections | $616 |  | $670 |  | $1,720 |  | $1,731
Write-offs, net of recoveries | 5 |  | 3 |  | 9 |  | 6
Effective October 2023, the limit on cash proceeds under the Receivables Agreement is $5 million.
WPL [Member] |
Receivables [Line Items] |
Receivables | RECEIVABLES NOTE 4(a) - Accounts Receivable - For the three and nine months ended September 30, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable were as follows (in millions):
| Originated in 2022 |  | Originated in 2023
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
Alliant Energy | $3 |  | $11 |  | $6 |  | $8
IPL | 2 |  | 7 |  | 4 |  | 5
WPL | 1 |  | 4 |  | 2 |  | 3

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
Name: | us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=lnt_IplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lnt_WplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |