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Subsidiaries | Formation Jurisdiction | ||||
Bombard Electric, LLC | Nevada | ||||
Bombard Mechanical, LLC | Nevada | ||||
Capital Electric Construction Company, Inc. | Kansas | ||||
Capital Electric Line Builders, LLC | Kansas | ||||
Cascade Natural Gas Corporation | Washington | ||||
CEHI, LLC | Delaware | ||||
Centennial Holdings Capital LLC | Delaware | ||||
Desert Fire Holdings, Inc. | Nevada | ||||
Desert Fire Protection, a Nevada Limited Partnership | Nevada | ||||
Desert Fire Protection, Inc. | Nevada | ||||
Desert Fire Protection, LLC | Nevada | ||||
Duro Electric Company | Colorado | ||||
E.S.I., Inc. | Ohio | ||||
Fidelity Exploration & Production Company | Delaware | ||||
Frebco, Inc. | Ohio | ||||
FutureSource Capital Corp. | Delaware | ||||
Intermountain Gas Company | Idaho | ||||
International Line Builders, Inc. | Delaware | ||||
InterSource Insurance Company | Vermont | ||||
Lone Mountain Excavation & Utilities, LLC | Nevada | ||||
Loy Clark Pipeline Co. | Oregon | ||||
MDU BenefitCo, LLC | Delaware | ||||
MDU Construction Services Group, Inc. | Delaware | ||||
MDU Energy Capital, LLC | Delaware | ||||
MDU Industrial Services, Inc. | Delaware | ||||
MDU United Construction Solutions, Inc. | Delaware | ||||
Montana-Dakota Utilities Co. | Delaware | ||||
OEG, Inc. | Oregon | ||||
PerLectric, Inc. | Virginia | ||||
Prairie Cascade Energy Holdings, LLC | Delaware | ||||
Prairie Intermountain Energy Holdings, LLC | Delaware | ||||
Rocky Mountain Contractors, Inc. | Montana | ||||
USI Industrial Services, Inc. | Delaware | ||||
Wagner Group, Inc., The | Delaware | ||||
Wagner-Smith Company, The | Ohio | ||||
Wagner-Smith Equipment Co. | Delaware | ||||
WBI Canadian Pipeline, Ltd. | Federally Chartered | ||||
WBI Energy Midstream, LLC | Colorado | ||||
WBI Energy Transmission, Inc. | Delaware | ||||
WBI Energy, Inc. | Delaware | ||||
WBI Holdings, Inc. | Delaware | ||||