Revenues

12 Months Ended

Dec. 31, 2022

Disaggregation of Revenue [Line Items]

Revenues

REVENUES

Revenues from Alliant Energy’s, IPL’s and WPL’s utility businesses are primarily from electric and gas sales provided to customers based on approved tariffs or specific contracts with customers. IPL’s and WPL’s primary performance obligations under such arrangements are to deliver electricity and gas, and their customers simultaneously receive and consume the electricity and gas. For such arrangements, revenues are recognized equivalent to the value of the electricity or gas supplied during each period, including amounts billed during each period and changes in amounts estimated to be billed at the end of each period. IPL and WPL apply the right to invoice method to measure progress towards completing performance obligations to transfer electricity and gas to their customers.

IPL provides retail electric and gas service to customers in Iowa, and WPL provides retail and wholesale electric and retail gas service to customers in Wisconsin. IPL also provides electricity to wholesale customers in Minnesota, Illinois and Iowa, as well as steam from its Prairie Creek Generating Station to high-pressure steam customers in Iowa.

IPL’s and WPL’s retail electric and gas revenues include sales to residential, commercial and industrial customers. IPL’s and WPL’s retail electric and gas customer prices are based on IPL’s and WPL’s cost of service and are determined through general rate review proceedings and various tariff filings with the IUB and PSCW, respectively. Such tariff-based services provide electricity or gas to customers without a defined contractual term.

IPL and WPL have wholesale electric market-based rate authority from FERC allowing them to participate in wholesale energy markets (e.g. MISO) and transact directly with third parties. This authority from FERC allows sales of electricity referred to as bulk power sales based on current market values. FERC also allows IPL and WPL to enter into power supply agreements with

municipalities and rural electric cooperatives with defined contractual terms, which include standard pricing mechanisms that are detailed in current tariffs accepted by FERC through wholesale rate review proceedings.

Revenues from Alliant Energy’s non-utility business customers are primarily from its Travero business, which includes a short-line rail freight service in Iowa; a Mississippi River barge, rail and truck freight terminal in Illinois; freight brokerage services; and a rail-served warehouse in Iowa.

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

	Alliant Energy			IPL			WPL
	2022	2021	2020	2022	2021	2020	2022	2021	2020
Electric Utility:
Retail - residential	$1,233	$1,115	$1,093	$673	$620	$602	$560	$495	$491
Retail - commercial	821	763	718	536	508	474	285	255	244
Retail - industrial	965	893	841	538	505	488	427	388	353
Wholesale	233	187	168	64	57	57	169	130	111
Bulk power and other	169	123	100	48	62	74	121	61	26
Total Electric Utility	3,421	3,081	2,920	1,859	1,752	1,695	1,562	1,329	1,225
Gas Utility:
Retail - residential	371	257	214	202	146	116	169	111	98
Retail - commercial	197	139	107	101	79	59	96	60	48
Retail - industrial	20	17	12	14	12	8	6	5	4
Transportation/other	54	43	40	34	28	25	20	15	15
Total Gas Utility	642	456	373	351	265	208	291	191	165
Other Utility:
Steam	39	36	36	39	36	36	—	—	—
Other utility	10	13	13	7	10	8	3	3	5
Total Other Utility	49	49	49	46	46	44	3	3	5
Non-Utility and Other:
Travero and other	93	83	74	—	—	—	—	—	—
Total Non-Utility and Other	93	83	74	—	—	—	—	—	—
Total revenues	$4,205	$3,669	$3,416	$2,256	$2,063	$1,947	$1,856	$1,523	$1,395

IPL [Member]

Disaggregation of Revenue [Line Items]

Revenues

REVENUES

Revenues from Alliant Energy’s, IPL’s and WPL’s utility businesses are primarily from electric and gas sales provided to customers based on approved tariffs or specific contracts with customers. IPL’s and WPL’s primary performance obligations under such arrangements are to deliver electricity and gas, and their customers simultaneously receive and consume the electricity and gas. For such arrangements, revenues are recognized equivalent to the value of the electricity or gas supplied during each period, including amounts billed during each period and changes in amounts estimated to be billed at the end of each period. IPL and WPL apply the right to invoice method to measure progress towards completing performance obligations to transfer electricity and gas to their customers.

IPL provides retail electric and gas service to customers in Iowa, and WPL provides retail and wholesale electric and retail gas service to customers in Wisconsin. IPL also provides electricity to wholesale customers in Minnesota, Illinois and Iowa, as well as steam from its Prairie Creek Generating Station to high-pressure steam customers in Iowa.

IPL’s and WPL’s retail electric and gas revenues include sales to residential, commercial and industrial customers. IPL’s and WPL’s retail electric and gas customer prices are based on IPL’s and WPL’s cost of service and are determined through general rate review proceedings and various tariff filings with the IUB and PSCW, respectively. Such tariff-based services provide electricity or gas to customers without a defined contractual term.

IPL and WPL have wholesale electric market-based rate authority from FERC allowing them to participate in wholesale energy markets (e.g. MISO) and transact directly with third parties. This authority from FERC allows sales of electricity referred to as bulk power sales based on current market values. FERC also allows IPL and WPL to enter into power supply agreements with

municipalities and rural electric cooperatives with defined contractual terms, which include standard pricing mechanisms that are detailed in current tariffs accepted by FERC through wholesale rate review proceedings.

Revenues from Alliant Energy’s non-utility business customers are primarily from its Travero business, which includes a short-line rail freight service in Iowa; a Mississippi River barge, rail and truck freight terminal in Illinois; freight brokerage services; and a rail-served warehouse in Iowa.

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

	Alliant Energy			IPL			WPL
	2022	2021	2020	2022	2021	2020	2022	2021	2020
Electric Utility:
Retail - residential	$1,233	$1,115	$1,093	$673	$620	$602	$560	$495	$491
Retail - commercial	821	763	718	536	508	474	285	255	244
Retail - industrial	965	893	841	538	505	488	427	388	353
Wholesale	233	187	168	64	57	57	169	130	111
Bulk power and other	169	123	100	48	62	74	121	61	26
Total Electric Utility	3,421	3,081	2,920	1,859	1,752	1,695	1,562	1,329	1,225
Gas Utility:
Retail - residential	371	257	214	202	146	116	169	111	98
Retail - commercial	197	139	107	101	79	59	96	60	48
Retail - industrial	20	17	12	14	12	8	6	5	4
Transportation/other	54	43	40	34	28	25	20	15	15
Total Gas Utility	642	456	373	351	265	208	291	191	165
Other Utility:
Steam	39	36	36	39	36	36	—	—	—
Other utility	10	13	13	7	10	8	3	3	5
Total Other Utility	49	49	49	46	46	44	3	3	5
Non-Utility and Other:
Travero and other	93	83	74	—	—	—	—	—	—
Total Non-Utility and Other	93	83	74	—	—	—	—	—	—
Total revenues	$4,205	$3,669	$3,416	$2,256	$2,063	$1,947	$1,856	$1,523	$1,395

WPL [Member]

Disaggregation of Revenue [Line Items]

Revenues

REVENUES

Revenues from Alliant Energy’s, IPL’s and WPL’s utility businesses are primarily from electric and gas sales provided to customers based on approved tariffs or specific contracts with customers. IPL’s and WPL’s primary performance obligations under such arrangements are to deliver electricity and gas, and their customers simultaneously receive and consume the electricity and gas. For such arrangements, revenues are recognized equivalent to the value of the electricity or gas supplied during each period, including amounts billed during each period and changes in amounts estimated to be billed at the end of each period. IPL and WPL apply the right to invoice method to measure progress towards completing performance obligations to transfer electricity and gas to their customers.

IPL provides retail electric and gas service to customers in Iowa, and WPL provides retail and wholesale electric and retail gas service to customers in Wisconsin. IPL also provides electricity to wholesale customers in Minnesota, Illinois and Iowa, as well as steam from its Prairie Creek Generating Station to high-pressure steam customers in Iowa.

IPL’s and WPL’s retail electric and gas revenues include sales to residential, commercial and industrial customers. IPL’s and WPL’s retail electric and gas customer prices are based on IPL’s and WPL’s cost of service and are determined through general rate review proceedings and various tariff filings with the IUB and PSCW, respectively. Such tariff-based services provide electricity or gas to customers without a defined contractual term.

IPL and WPL have wholesale electric market-based rate authority from FERC allowing them to participate in wholesale energy markets (e.g. MISO) and transact directly with third parties. This authority from FERC allows sales of electricity referred to as bulk power sales based on current market values. FERC also allows IPL and WPL to enter into power supply agreements with

municipalities and rural electric cooperatives with defined contractual terms, which include standard pricing mechanisms that are detailed in current tariffs accepted by FERC through wholesale rate review proceedings.

Revenues from Alliant Energy’s non-utility business customers are primarily from its Travero business, which includes a short-line rail freight service in Iowa; a Mississippi River barge, rail and truck freight terminal in Illinois; freight brokerage services; and a rail-served warehouse in Iowa.

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

	Alliant Energy			IPL			WPL
	2022	2021	2020	2022	2021	2020	2022	2021	2020
Electric Utility:
Retail - residential	$1,233	$1,115	$1,093	$673	$620	$602	$560	$495	$491
Retail - commercial	821	763	718	536	508	474	285	255	244
Retail - industrial	965	893	841	538	505	488	427	388	353
Wholesale	233	187	168	64	57	57	169	130	111
Bulk power and other	169	123	100	48	62	74	121	61	26
Total Electric Utility	3,421	3,081	2,920	1,859	1,752	1,695	1,562	1,329	1,225
Gas Utility:
Retail - residential	371	257	214	202	146	116	169	111	98
Retail - commercial	197	139	107	101	79	59	96	60	48
Retail - industrial	20	17	12	14	12	8	6	5	4
Transportation/other	54	43	40	34	28	25	20	15	15
Total Gas Utility	642	456	373	351	265	208	291	191	165
Other Utility:
Steam	39	36	36	39	36	36	—	—	—
Other utility	10	13	13	7	10	8	3	3	5
Total Other Utility	49	49	49	46	46	44	3	3	5
Non-Utility and Other:
Travero and other	93	83	74	—	—	—	—	—	—
Total Non-Utility and Other	93	83	74	—	—	—	—	—	—
Total revenues	$4,205	$3,669	$3,416	$2,256	$2,063	$1,947	$1,856	$1,523	$1,395