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Revenues
12 Months Ended
Dec. 31, 2023
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 EnergyIPLWPL
202320222021202320222021202320222021
Electric Utility:
Retail - residential$1,220 $1,233 $1,115 $641 $673 $620 $579 $560 $495 
Retail - commercial820 821 763 519 536 508 301 285 255 
Retail - industrial968 965 893 501 538 505 467 427 388 
Wholesale213 233 187 62 64 57 151 169 130 
Bulk power and other124 169 123 38 48 62 86 121 61 
Total Electric Utility3,345 3,421 3,081 1,761 1,859 1,752 1,584 1,562 1,329 
Gas Utility:
Retail - residential316 371 257 176 202 146 140 169 111 
Retail - commercial163 197 139 86 101 79 77 96 60 
Retail - industrial16 20 17 11 14 12 5 
Transportation/other45 54 43 27 34 28 18 20 15 
Total Gas Utility540 642 456 300 351 265 240 291 191 
Other Utility:
Steam45 39 36 45 39 36  — — 
Other utility7 10 13 4 10 3 
Total Other Utility52 49 49 49 46 46 3 
Non-Utility and Other:
Travero and other90 93 83  — —  — — 
Total Non-Utility and Other90 93 83  — —  — — 
Total revenues$4,027 $4,205 $3,669 $2,110 $2,256 $2,063 $1,827 $1,856 $1,523 
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 EnergyIPLWPL
202320222021202320222021202320222021
Electric Utility:
Retail - residential$1,220 $1,233 $1,115 $641 $673 $620 $579 $560 $495 
Retail - commercial820 821 763 519 536 508 301 285 255 
Retail - industrial968 965 893 501 538 505 467 427 388 
Wholesale213 233 187 62 64 57 151 169 130 
Bulk power and other124 169 123 38 48 62 86 121 61 
Total Electric Utility3,345 3,421 3,081 1,761 1,859 1,752 1,584 1,562 1,329 
Gas Utility:
Retail - residential316 371 257 176 202 146 140 169 111 
Retail - commercial163 197 139 86 101 79 77 96 60 
Retail - industrial16 20 17 11 14 12 5 
Transportation/other45 54 43 27 34 28 18 20 15 
Total Gas Utility540 642 456 300 351 265 240 291 191 
Other Utility:
Steam45 39 36 45 39 36  — — 
Other utility7 10 13 4 10 3 
Total Other Utility52 49 49 49 46 46 3 
Non-Utility and Other:
Travero and other90 93 83  — —  — — 
Total Non-Utility and Other90 93 83  — —  — — 
Total revenues$4,027 $4,205 $3,669 $2,110 $2,256 $2,063 $1,827 $1,856 $1,523 
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 EnergyIPLWPL
202320222021202320222021202320222021
Electric Utility:
Retail - residential$1,220 $1,233 $1,115 $641 $673 $620 $579 $560 $495 
Retail - commercial820 821 763 519 536 508 301 285 255 
Retail - industrial968 965 893 501 538 505 467 427 388 
Wholesale213 233 187 62 64 57 151 169 130 
Bulk power and other124 169 123 38 48 62 86 121 61 
Total Electric Utility3,345 3,421 3,081 1,761 1,859 1,752 1,584 1,562 1,329 
Gas Utility:
Retail - residential316 371 257 176 202 146 140 169 111 
Retail - commercial163 197 139 86 101 79 77 96 60 
Retail - industrial16 20 17 11 14 12 5 
Transportation/other45 54 43 27 34 28 18 20 15 
Total Gas Utility540 642 456 300 351 265 240 291 191 
Other Utility:
Steam45 39 36 45 39 36  — — 
Other utility7 10 13 4 10 3 
Total Other Utility52 49 49 49 46 46 3 
Non-Utility and Other:
Travero and other90 93 83  — —  — — 
Total Non-Utility and Other90 93 83  — —  — — 
Total revenues$4,027 $4,205 $3,669 $2,110 $2,256 $2,063 $1,827 $1,856 $1,523