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Revenue (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Summary of Revenue Disaggregated by Service Type and Contract Type
Gas operating revenues on the Consolidated Statements of Income of both the Company and Southwest include revenue from contracts with customers, which is shown below disaggregated by customer type, and various categories of revenue:
 December 31,
(Thousands of dollars)202120202019
Residential$1,035,612 $958,520 $972,788 
Small commercial270,214 221,541 249,117 
Large commercial57,371 44,633 48,935 
Industrial/other42,313 26,242 22,074 
Transportation92,240 88,215 92,380 
Revenue from contracts with customers1,497,750 1,339,151 1,385,294 
Alternative revenue program deferrals13,181 12,140 (25,112)
Other revenues (a)10,859 (706)8,757 
Total Gas operating revenues$1,521,790 $1,350,585 $1,368,939 
(a) Amounts include late fees and other miscellaneous revenues, and may also include the impact of certain regulatory mechanisms, such as cost-of-service components in current customer rates that are expected to be returned to customers in future periods. Also includes the impacts of a temporary moratorium on late fees and disconnection for nonpayment during the COVID-19 pandemic and impacts between periods, once lifted; 2020 and 2019 include amounts related to tax reform savings reserves/adjustments.
The following tables display Centuri’s revenue from contracts with customers disaggregated by service type and contract type:
December 31,
(Thousands of dollars)202120202019
Service Types:
Gas infrastructure services$1,302,340 $1,261,160 $1,238,974 
Electric power infrastructure services525,202 411,826 247,717 
Other331,119 275,302 264,287 
Total Utility infrastructure services revenues$2,158,661 $1,948,288 $1,750,978 
December 31,
(Thousands of dollars)202120202019
Contract Types:
Master services agreement$1,652,978 $1,490,009 $1,383,377 
Bid contract505,683 458,279 367,601 
Total Utility infrastructure services revenues$2,158,661 $1,948,288 $1,750,978 
Unit price contracts$1,369,082 $1,356,640 $1,380,256 
Fixed price contracts267,742 157,701 112,924 
Time and materials contracts521,837 433,947 257,798 
Total Utility infrastructure services revenues$2,158,661 $1,948,288 $1,750,978 
Summary of Information about Receivables, Revenue Earned on Contracts in Progress in Excess of Billings, and Amounts Billed in Excess of Revenue Earned on Contracts
The following table provides information about contracts receivable and revenue earned on contracts in progress in excess of billings (contract assets), both of which are included within Accounts receivable, net of allowances, and provides information about amounts billed in excess of revenue earned on contracts (contract liabilities), which are included in Other current liabilities as of December 31, 2021 and 2020 on the Company’s Consolidated Balance Sheets:
December 31,
(Thousands of dollars)20212020
Contracts receivable, net$296,005 $278,316 
Revenue earned on contracts in progress in excess of billings214,774 96,996 
Amounts billed in excess of revenue earned on contracts11,860 4,507 
Schedule of Utility Infrastructure Services Contracts Receivable
Utility infrastructure services contracts receivable consists of the following:
December 31,
(Thousands of dollars)20212020
Billed on completed contracts and contracts in progress$292,770 $273,778 
Other receivables3,492 6,692 
Contracts receivable, gross296,262 280,470 
Allowance for doubtful accounts(257)(2,154)
Contracts receivable, net$296,005 $278,316