Receivables (Tables)

12 Months Ended

Dec. 31, 2023

Receivables [Line Items]

Accounts Receivable Details

Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):

	Alliant Energy		IPL		WPL
	2023	2022	2023	2022	2023	2022
Customer	$121	$114	$—	$—	$110	$102
Unbilled utility revenues	93	115	—	—	93	115
Deferred proceeds	216	185	216	185	—	—
Other	53	109	26	74	24	34
Allowance for expected credit losses	(8)	(7)	—	—	(8)	(7)
	$475	$516	$242	$259	$219	$244

Gross Write-offs for Accounts Receivable

In 2023, gross write-offs for accounts receivable were as follows (in millions):

	Originated in 2022	Originated in 2023
Alliant Energy	$12	$13
IPL	8	8
WPL	4	5

Maximum And Average Outstanding Cash Proceeds

IPL’s maximum and average outstanding aggregate cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program were as follows (in millions):

	Maximum			Average
	2023	2022	2021	2023	2022	2021
Outstanding aggregate cash proceeds	$110	$80	$110	$51	$14	$46

Receivables Sold Under the Agreement

As of December 31, the attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):

	2023	2022
Customer accounts receivable	$130	$145
Unbilled utility revenues	98	132
Other receivables	1	—
Receivables sold to third party	229	277
Less: cash proceeds	1	80
Deferred proceeds	228	197
Less: allowance for expected credit losses	12	12
Fair value of deferred proceeds	$216	$185
Outstanding receivables past due	$22	$26

Additional Attributes Of Receivables Sold Under The Agreement

Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):

	2023	2022	2021
Collections	$2,233	$2,302	$2,134
Write-offs, net of recoveries	12	9	9

IPL [Member]

Receivables [Line Items]

Accounts Receivable Details

Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):

	Alliant Energy		IPL		WPL
	2023	2022	2023	2022	2023	2022
Customer	$121	$114	$—	$—	$110	$102
Unbilled utility revenues	93	115	—	—	93	115
Deferred proceeds	216	185	216	185	—	—
Other	53	109	26	74	24	34
Allowance for expected credit losses	(8)	(7)	—	—	(8)	(7)
	$475	$516	$242	$259	$219	$244

Gross Write-offs for Accounts Receivable

In 2023, gross write-offs for accounts receivable were as follows (in millions):

	Originated in 2022	Originated in 2023
Alliant Energy	$12	$13
IPL	8	8
WPL	4	5

Maximum And Average Outstanding Cash Proceeds

IPL’s maximum and average outstanding aggregate cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program were as follows (in millions):

	Maximum			Average
	2023	2022	2021	2023	2022	2021
Outstanding aggregate cash proceeds	$110	$80	$110	$51	$14	$46

Receivables Sold Under the Agreement

As of December 31, the attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):

	2023	2022
Customer accounts receivable	$130	$145
Unbilled utility revenues	98	132
Other receivables	1	—
Receivables sold to third party	229	277
Less: cash proceeds	1	80
Deferred proceeds	228	197
Less: allowance for expected credit losses	12	12
Fair value of deferred proceeds	$216	$185
Outstanding receivables past due	$22	$26

Additional Attributes Of Receivables Sold Under The Agreement

Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):

	2023	2022	2021
Collections	$2,233	$2,302	$2,134
Write-offs, net of recoveries	12	9	9

WPL [Member]

Receivables [Line Items]

Accounts Receivable Details

Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):

	Alliant Energy		IPL		WPL
	2023	2022	2023	2022	2023	2022
Customer	$121	$114	$—	$—	$110	$102
Unbilled utility revenues	93	115	—	—	93	115
Deferred proceeds	216	185	216	185	—	—
Other	53	109	26	74	24	34
Allowance for expected credit losses	(8)	(7)	—	—	(8)	(7)
	$475	$516	$242	$259	$219	$244

Gross Write-offs for Accounts Receivable

In 2023, gross write-offs for accounts receivable were as follows (in millions):

	Originated in 2022	Originated in 2023
Alliant Energy	$12	$13
IPL	8	8
WPL	4	5