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Revenues
 12 Months Ended
Dec. 31, 2021
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 sells 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, which began operations in 2021.
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202120202019202120202019202120202019
Electric Utility:
Retail - residential$1,115 $1,093 $1,092 $620 $602 $601 $495 $491 $491 
Retail - commercial763 718 770 508 474 510 255 244 260 
Retail - industrial893 841 889 505 488 504 388 353 385 
Wholesale187 168 177 57 57 64 130 111 113 
Bulk power and other123 100 136 62 74 102 61 26 34 
Total Electric Utility3,081 2,920 3,064 1,752 1,695 1,781 1,329 1,225 1,283 
Gas Utility:
Retail - residential257 214 259 146 116 149 111 98 110 
Retail - commercial139 107 133 79 59 75 60 48 58 
Retail - industrial17 12 16 12 8 12 5 4 4 
Transportation/other43 40 47 28 25 28 15 15 19 
Total Gas Utility456 373 455 265 208 264 191 165 191 
Other Utility:
Steam36 36 37 36 36 37 — — — 
Other utility13 13 9 10 8 7 3 5 2 
Total Other Utility49 49 46 46 44 44 3 5 2 
Non-Utility and Other:
Travero and other83 74 83 — — — — — — 
Total Non-Utility and Other83 74 83 — — — — — — 
Total revenues$3,669 $3,416 $3,648 $2,063 $1,947 $2,089 $1,523 $1,395 $1,476 
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 sells 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, which began operations in 2021.
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202120202019202120202019202120202019
Electric Utility:
Retail - residential$1,115 $1,093 $1,092 $620 $602 $601 $495 $491 $491 
Retail - commercial763 718 770 508 474 510 255 244 260 
Retail - industrial893 841 889 505 488 504 388 353 385 
Wholesale187 168 177 57 57 64 130 111 113 
Bulk power and other123 100 136 62 74 102 61 26 34 
Total Electric Utility3,081 2,920 3,064 1,752 1,695 1,781 1,329 1,225 1,283 
Gas Utility:
Retail - residential257 214 259 146 116 149 111 98 110 
Retail - commercial139 107 133 79 59 75 60 48 58 
Retail - industrial17 12 16 12 8 12 5 4 4 
Transportation/other43 40 47 28 25 28 15 15 19 
Total Gas Utility456 373 455 265 208 264 191 165 191 
Other Utility:
Steam36 36 37 36 36 37 — — — 
Other utility13 13 9 10 8 7 3 5 2 
Total Other Utility49 49 46 46 44 44 3 5 2 
Non-Utility and Other:
Travero and other83 74 83 — — — — — — 
Total Non-Utility and Other83 74 83 — — — — — — 
Total revenues$3,669 $3,416 $3,648 $2,063 $1,947 $2,089 $1,523 $1,395 $1,476 
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 sells 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, which began operations in 2021.
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202120202019202120202019202120202019
Electric Utility:
Retail - residential$1,115 $1,093 $1,092 $620 $602 $601 $495 $491 $491 
Retail - commercial763 718 770 508 474 510 255 244 260 
Retail - industrial893 841 889 505 488 504 388 353 385 
Wholesale187 168 177 57 57 64 130 111 113 
Bulk power and other123 100 136 62 74 102 61 26 34 
Total Electric Utility3,081 2,920 3,064 1,752 1,695 1,781 1,329 1,225 1,283 
Gas Utility:
Retail - residential257 214 259 146 116 149 111 98 110 
Retail - commercial139 107 133 79 59 75 60 48 58 
Retail - industrial17 12 16 12 8 12 5 4 4 
Transportation/other43 40 47 28 25 28 15 15 19 
Total Gas Utility456 373 455 265 208 264 191 165 191 
Other Utility:
Steam36 36 37 36 36 37 — — — 
Other utility13 13 9 10 8 7 3 5 2 
Total Other Utility49 49 46 46 44 44 3 5 2 
Non-Utility and Other:
Travero and other83 74 83 — — — — — — 
Total Non-Utility and Other83 74 83 — — — — — — 
Total revenues$3,669 $3,416 $3,648 $2,063 $1,947 $2,089 $1,523 $1,395 $1,476