Revenue (Tables)

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Summary of Revenue Disaggregated by Service Type and Contract Type

Southwest’s operating revenues included 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, in addition to other categories of revenue:

	December 31,
(Thousands of dollars)	2022		2021		2020
Residential	$	1,324,794	$	1,035,612	$	958,520
Small commercial	378,520		270,214		221,541
Large commercial	85,234		57,371		44,633
Industrial/other	50,894		42,313		26,242
Transportation	100,642		92,240		88,215
Revenue from contracts with customers	1,940,084		1,497,750		1,339,151
Alternative revenue program revenues (deferrals)	(18,478)		13,181		12,140
Other revenues (a)	13,463		10,859		(706)
Total Regulated operations revenues	$	1,935,069	$	1,521,790	$	1,350,585

(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 pandemic-period moratorium on late fees and disconnection for nonpayment during the majority of 2020 and part of 2021; 2020 also includes 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)	2022		2021		2020
Service Types:
Gas infrastructure services	$	1,531,818	$	1,302,340	$	1,261,160
Electric power infrastructure services	778,124		525,202		411,826
Other	450,385		331,119		275,302
Total Utility infrastructure services revenues	$	2,760,327	$	2,158,661	$	1,948,288

	December 31,
(Thousands of dollars)	2022		2021		2020
Contract Types:
Master services agreement	$	2,342,220	$	1,652,978	$	1,490,009
Bid contract	418,107		505,683		458,279
Total Utility infrastructure services revenues	$	2,760,327	$	2,158,661	$	1,948,288
Unit-price contracts	$	1,608,131	$	1,369,082	$	1,356,640
Fixed-price contracts	498,039		267,742		157,701
Time and materials contracts	654,157		521,837		433,947
Total Utility infrastructure services revenues	$	2,760,327	$	2,158,661	$	1,948,288

MountainWest Regulated operations revenues on the Consolidated Statements of Income of the Company include revenue from contracts with customers, which is shown below, disaggregated by categories of sales and service activities.

(Thousands of dollars)	December 31, 2022
Regulated gas transportation and storage revenues	$	248,304
NGL revenues	5,983
Other revenues	10,152
Revenue from contracts with customers	264,439
Other revenues	174
Total Regulated operations revenues	$	264,613

Summary of Information about Receivables, Revenue Earned on Contracts in Progress in Excess of Billings, Which are Included Within Accounts Receivable, Net of Allowances, 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, 2022 and 2021 on the Company’s Consolidated Balance Sheets:

	December 31,
(Thousands of dollars)	2022		2021
Contracts receivable, net	$	394,022	$	296,005
Revenue earned on contracts in progress in excess of billings	238,059		214,774
Amounts billed in excess of revenue earned on contracts	35,769		11,860

Schedule of Utility Infrastructure Services Contracts Receivable

Utility infrastructure services contracts receivable consists of the following:

	December 31,
(Thousands of dollars)	2022		2021
Billed on completed contracts and contracts in progress	$	395,771	$	292,770
Other receivables	2,569		3,492
Contracts receivable, gross	398,340		296,262
Allowance for doubtful accounts	(4,318)		(257)
Contracts receivable, net	$	394,022	$	296,005