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Employee Benefit Plans
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
Nonqualified Deferred Compensation Plans 
In 2012, MDU Resources established a nonqualified deferred compensation plan for certain key management employees, including certain employees of the Company. In 2020, the plan was frozen to new participants and no new Company contributions were made to the plan after December 31, 2020. Vesting for participants not fully vested was retained. To replace the plan originally established in 2012, a new nonqualified deferred compensation plan was adopted in 2020 by MDU Resources, effective January 1, 2021.
In connection with the Separation, the Company adopted its own nonqualified deferred compensation plan, effective October 31, 2024, in which eligible employees of the Company may participate. Previous Company employee liability balances related to the MDU Resources 2020 plan were transferred to the Company. The original MDU Resources 2012 plan associated liability balances were assumed by MDU Resources.
Expenses incurred by the Company under these plans for the years ended December 31, 2024, 2023 and 2022 were $1.3 million, $1.6 million, and $1.1 million, respectively.
Defined Contribution Plans 
Prior to the Separation, MDU Resources sponsored a defined contribution plan in which the Company participated. As a result of the Separation, the Company now sponsors its own defined contribution plan, effective September 1, 2024, in which its employees participate and previous Company employee liability balances were transferred from the MDU Resources sponsored plan to the Company. The costs incurred by the Company under these plans for eligible employees were $6.2 million, $4.5 million and $4.5 million for the years ended December 31, 2024, 2023 and 2022, respectively. 
Multiemployer Plans 
The Company also contributes to a number of multiemployer pension plans under the terms of collective bargaining agreements that cover its union-represented employees. The risks of participating in these multiemployer plans are different from single-employer plans in the following aspects:
•Assets contributed to the multiemployer plans by one employer may be used to provide benefits to employees of other participating employers. 
•If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. 
•If the Company chooses to stop participating in some of its multiemployer plans, the Company may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability.
Amounts contributed to defined contribution multiemployer plans were $67.3 million, $73.3 million, and $67.6 million for the years ended December 31, 2024, 2023 and 2022, respectively.
Amounts contributed to defined benefit multiemployer plans were $82.8 million, $95.4 million, and $86.7 million for the years ended December 31, 2024, 2023 and 2022, respectively.
The Company also contributes to a number of multiemployer other postretirement plans under the terms of collective bargaining agreements that cover its union-represented employees. These plans provide benefits such as health insurance, disability insurance and life insurance to retired union employees. Many of the multiemployer other postretirement plans are combined with active multiemployer health and welfare plans. The Company’s total contributions to its multiemployer other postretirement plans, which includes contributions to active multiemployer health and welfare plans, were $91.5 million, $86.6 million, and $79.1 million for the years ended December 31, 2024, 2023 and 2022, respectively.
Approximately 83 percent of the Company’s total workforce is covered by collective bargaining agreements. Approximately 24 percent of the collective bargaining agreements are set to expire within one year.
The Company’s participation in the defined benefit multiemployer plans is outlined in the following table. Unless otherwise noted, the most recent Pension Protection Act zone status available in 2024, 2023 and 2022 is for the plan’s year-end as of December 31, 2024, 2023 and 2022, respectively. The zone status is based on information that the Company received from the plan and is certified by the plan’s actuary.
Among other factors, plans in the red zone generally are less than 65 percent funded, plans in the yellow zone are between 65 percent and 80 percent funded, and plans in the green zone are at least 80 percent funded.
Pension Fund 
EIN/ Pension 
Plan Number 
Pension Protection Act Zone Status FIP/RP Status Pending/ Implemented Contributions Surcharge Imposed Expiration Date of Collective Bargaining Agreement
2024
2023
2024
2023
2022
Edison Pension Plan
936061681-001
Green GreenNo $23,310 $16,957 $18,750 No 12/31/2026
IBEW Local 357 Pension Plan A
886023284-001Green GreenNo 4,376 18,936 12,876 No 
5/31/2027
IBEW Local 82 Pension Plan
316127268-001
Green as of 6/30/2024
Green as of 6/30/2023No 2,518 2,149 1,854 No 12/6/2026
IBEW Local 683 Pension Fund Pension Plan
341442087-001Green GreenNo 6,650 3,986 3,362 No 
5/30/2027
NEBF - National Electrical Benefit Fund
530181657-001Green GreenNo 18,233 19,040 18,060 No 
8/25/2024-1/31/2029
Pension and Retirement Plan of Plumbers and Pipefitters Local 525
886003864-001
Green as of 6/30/2024
Green as of 6/30/2022No 3,788 8,020 6,304 No 
9/30/2025
Sheet Metal Workers Pension Plan of Southern CA, AZ, and NV
956052257-001Green Green
No
2,189 3,631 3,400 No 
6/30/2028
Other Funds 
21,722 22,639 22,060 
Total Contributions
$82,786 $95,358 $86,666 
The Company was listed in the plans’ Forms 5500 as providing more than 5 percent of the total contributions for the following plans and plan years:
Pension Fund 
Year Contributions to Plan Exceeded More Than 5 Percent of Total Contributions (as of December 31 of the Plan’s Year-End) 
DB Pension Plan of AGC-IUOE Local 701 Pension Trust Fund
2023
Edison Pension Plan
2023 and 2022
Eight District Electrical Pension Fund
2022
Electrical Workers Local No. 26 Pension Fund
2023 and 2022
IBEW Local 82 Pension Plan
2023 and 2022
IBEW Local 124 Pension Trust Fund
2023 and 2022
IBEW Local 212 Pension Trust Fund
2023 and 2022
IBEW Local 357 Pension Plan A
2023 and 2022
IBEW Local 648 Pension Plan
2023 and 2022
IBEW Local 683 Pension Fund Pension Plan
2023 and 2022
National Electrical Benefit Fund
2023 and 2022
Pension and Retirement Plan of Plumbers and Pipefitters Local 525
2023 and 2022
Sheet Metal Workers Pension Plan of Southern, CA AZ and NV
2023 and 2022
Western States Insulators and Allied Workers’ Pension Plan
2023 and 2022