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Related-party Transactions
 12 Months Ended
Dec. 31, 2025
Related Party Transactions [Abstract]  
Related-party Transactions Related-party Transactions
Allocation of corporate expenses
Prior to the Separation, Centennial and MDU Resources provided expense allocations for corporate services provided to us, including costs related to senior management, legal, human resources, finance and accounting, treasury, information technology, and other shared services. Some of these services were provided by MDU Resources on a temporary basis under a transition services agreement. For the year ended December 31, 2023, we were allocated $10.7 million for these corporate services and for the years ended December 31, 2025 and 2024, there were no expenses allocated. These expenses were allocated to us on the basis of direct usage when identifiable, with the remainder allocated on the basis of percent of total capital invested, the percent of total average commercial paper borrowings at Centennial or other allocation methodologies that are considered to be a reasonable reflection of the utilization of the services provided to the benefits received, including the following: number of employees paid and stated as cost per check; number of employees served; weighted factor of travel, managed units, national
account spending, equipment and fleet acquisitions; purchase order dollars spent and purchase order line count; number of payments, vouchers or unclaimed property reports; labor hours; time tracked; and projected workload.
Management believes these cost allocations were a reasonable reflection of the utilization of services provided to, or the benefit derived by, us during the periods presented. The allocations may not, however, be indicative of the actual expenses that would have been incurred had we operated as a stand-alone public company for these periods. Actual costs that would have been incurred if we had been a stand-alone public company would depend on a number of factors, including the chosen organizational structure, whether functions were outsourced or performed by our employees, and strategic decisions made in areas such as selling and marketing, information technology and infrastructure.
Transition services agreements
As part of the Separation, MDU Resources provided transition services to us and we provided transition services to MDU Resources in accordance with the Transition Services Agreement entered into on May 30, 2023. For the years ended December 31, 2024 and 2023, we paid $1.2 million and $3.0 million, respectively, related to these activities, which was reflected in selling, general and administrative expenses on the Consolidated Statements of Operations. For the years ended December 31, 2024 and 2023, we received $156,000 and $824,000, respectively, related to these activities, which was reflected in other income on the Consolidated Statements of Operations. The majority of the transition services were completed over a period of 1 year after the Separation and, as of December 31, 2024, no further obligation for services existed for either party.