Revenues (Tables)

3 Months Ended

Mar. 31, 2024

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2024	2023	2024	2023	2024	2023
Electric Utility:
Retail - residential	$297	$285	$150	$143	$147	$142
Retail - commercial	186	185	114	112	72	73
Retail - industrial	223	216	112	107	111	109
Wholesale	47	46	13	12	34	34
Bulk power and other	38	36	3	14	35	22
Total Electric Utility	791	768	392	388	399	380
Gas Utility:
Retail - residential	126	167	68	93	58	74
Retail - commercial	61	88	30	44	31	44
Retail - industrial	5	7	3	4	2	3
Transportation/other	13	14	7	9	6	5
Total Gas Utility	205	276	108	150	97	126
Other Utility:
Steam	12	10	12	10	—	—
Other utility	1	1	1	1	—	—
Total Other Utility	13	11	13	11	—	—
Non-Utility and Other:
Travero and other	22	22	—	—	—	—
Total Non-Utility and Other	22	22	—	—	—	—
Total revenues	$1,031	$1,077	$513	$549	$496	$506

IPL [Member]

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2024	2023	2024	2023	2024	2023
Electric Utility:
Retail - residential	$297	$285	$150	$143	$147	$142
Retail - commercial	186	185	114	112	72	73
Retail - industrial	223	216	112	107	111	109
Wholesale	47	46	13	12	34	34
Bulk power and other	38	36	3	14	35	22
Total Electric Utility	791	768	392	388	399	380
Gas Utility:
Retail - residential	126	167	68	93	58	74
Retail - commercial	61	88	30	44	31	44
Retail - industrial	5	7	3	4	2	3
Transportation/other	13	14	7	9	6	5
Total Gas Utility	205	276	108	150	97	126
Other Utility:
Steam	12	10	12	10	—	—
Other utility	1	1	1	1	—	—
Total Other Utility	13	11	13	11	—	—
Non-Utility and Other:
Travero and other	22	22	—	—	—	—
Total Non-Utility and Other	22	22	—	—	—	—
Total revenues	$1,031	$1,077	$513	$549	$496	$506

WPL [Member]

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2024	2023	2024	2023	2024	2023
Electric Utility:
Retail - residential	$297	$285	$150	$143	$147	$142
Retail - commercial	186	185	114	112	72	73
Retail - industrial	223	216	112	107	111	109
Wholesale	47	46	13	12	34	34
Bulk power and other	38	36	3	14	35	22
Total Electric Utility	791	768	392	388	399	380
Gas Utility:
Retail - residential	126	167	68	93	58	74
Retail - commercial	61	88	30	44	31	44
Retail - industrial	5	7	3	4	2	3
Transportation/other	13	14	7	9	6	5
Total Gas Utility	205	276	108	150	97	126
Other Utility:
Steam	12	10	12	10	—	—
Other utility	1	1	1	1	—	—
Total Other Utility	13	11	13	11	—	—
Non-Utility and Other:
Travero and other	22	22	—	—	—	—
Total Non-Utility and Other	22	22	—	—	—	—
Total revenues	$1,031	$1,077	$513	$549	$496	$506