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Business segment data
 9 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
Business segment data Business segment data
The Company's reportable segments are those that are based on the Company's method of internal reporting, which generally segregates the strategic business units due to differences in products, services and regulation. The internal reporting of these operating segments is defined based on the reporting and review process used by the Company's chief executive officer. The Company's operations are located within the United States.
The electric segment generates, transmits and distributes electricity in Montana, North Dakota, South Dakota and Wyoming. The natural gas distribution segment distributes natural gas in those states, as well as in Idaho, Minnesota, Oregon and Washington. These operations also supply related value-added services.
The pipeline segment provides natural gas transportation and underground storage services through a regulated pipeline system primarily in the Rocky Mountain and northern Great Plains regions of the United States. This segment also provides non-regulated energy-related services, including cathodic protection.
The construction services segment provides a full spectrum of construction services through its electrical and mechanical and transmission and distribution specialty contracting services across the United States. These specialty contracting services are provided to utilities, manufacturing, transportation, commercial, industrial, institutional, renewable and governmental customers. Its electrical and mechanical contracting services include construction and maintenance of electrical and communication wiring and infrastructure, fire suppression systems, and mechanical piping and services. Its transmission and distribution contracting services include construction and maintenance of overhead and underground electrical, gas and communication infrastructure, as well as manufacturing and supplying transmission and distribution line construction equipment and tools.
The Other category includes the activities of Centennial Capital, which, through its subsidiary InterSource Insurance Company, insures various types of risks as a captive insurer for certain of the Company's subsidiaries. The function of the captive insurer is to fund the self-insured layers of the insured Company's general liability, automobile liability, pollution liability and other coverages. Centennial Capital also owns certain real and personal property. In addition, the Other category includes certain assets, liabilities and tax adjustments of the holding company primarily associated with corporate functions, as well as costs associated with certain strategic initiatives. Also included are certain general and administrative costs (reflected in operation and maintenance expense) and interest expense, which were previously allocated to Knife River, Fidelity and the refining business which do not meet the criteria for income (loss) from discontinued operations.
Discontinued operations includes Knife River's operations, associated separation costs and interest on debt facilities repaid in connection with the Knife River separation. Discontinued operations also includes the supporting activities of Fidelity other than certain general and administrative costs and interest expense as described above.
The information below follows the same accounting policies as described in Note 2 of the Notes to Consolidated Financial Statements in the 2023 Annual Report. Information on the Company's segments was as follows:
Three Months EndedNine Months Ended
September 30,September 30,
 2024 2023 2024 2023 
 (In thousands)
External operating revenues:   
Regulated operations:
Electric$108,384 $108,089 $315,268 $294,775 
Natural gas distribution133,517 134,896 794,418 919,487 
Pipeline44,152 36,549 102,929 79,697 
 286,053 279,534 1,212,615 1,293,959 
Non-regulated operations:
Pipeline3,476 3,855 9,542 9,389 
Construction services760,986 717,406 2,089,711 2,218,672 
Other1 — 18 — 
 764,463 721,261 2,099,271 2,228,061 
Total external operating revenues$1,050,516 $1,000,795 $3,311,886 $3,522,020 
Intersegment operating revenues:    
Regulated operations:
Electric$96 $27 $188 $82 
Natural gas distribution104 69 209 208 
Pipeline3,904 3,666 43,033 37,624 
4,104 3,762 43,430 37,914 
Non-regulated operations:
Pipeline27 35 263 265 
Construction services— — 336 — 
Other1,432 1,689 4,265 6,412 
1,459 1,724 4,864 6,677 
Total intersegment operating revenues$5,563 $5,486 $48,294 $44,591 
Operating income (loss):
Electric$32,079 $28,718 $73,498 $71,372 
Natural gas distribution(14,695)(15,258)44,747 45,674 
Pipeline22,179 17,767 68,101 44,693 
Construction services53,709 50,091 143,902 139,619 
Other(2,468)3,286 (13,751)(16,201)
Total operating income$90,804 $84,604 $316,497 $285,157 
Income (loss) from continuing operations:
Regulated operations:
Electric$24,292 $20,942 $57,689 $53,887 
Natural gas distribution(17,481)(17,764)17,581 18,007 
Pipeline14,810 11,450 47,054 29,029 
21,621 14,628 122,324 100,923 
Non-regulated operations:
Pipeline374 508 447 337 
Construction services41,767 35,975 108,953 105,951 
Other(1,603)27,107 (8,093)102,515 
40,538 63,590 101,307 208,803 
Income from continuing operations62,159 78,218 223,631 309,726 
Discontinued operations, net of tax2,456 (3,289)2,319 (65,752)
Net income$64,615 $74,929 $225,950 $243,974 
A reconciliation of reportable segment operating revenues to consolidated operating revenues is as follows:
Three Months EndedNine Months Ended
September 30,September 30,
2024 2023 2024 2023 
(In thousands)
Operating revenues reconciliation:
Total reportable segment operating revenues$1,054,646 $1,004,592 $3,355,897 $3,560,199 
Other revenue1,433 1,689 4,283 6,412 
Elimination of intersegment operating revenues(5,563)(5,486)(48,294)(44,591)
Total consolidated operating revenues$1,050,516 $1,000,795 $3,311,886 $3,522,020