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Subsidiaries | Formation Jurisdiction | ||||
| Cascade Natural Gas Corporation | Washington | ||||
| CEHI, LLC | Delaware | ||||
| Centennial Holdings Capital LLC | Delaware | ||||
| Fidelity Exploration & Production Company | Delaware | ||||
| FutureSource Capital Corp. | Delaware | ||||
| Intermountain Gas Company | Idaho | ||||
| InterSource Insurance Company | Vermont | ||||
| MDU BenefitCo II, Inc. | Delaware | ||||
| MDU BenefitCo, LLC | Delaware | ||||
| MDU BPT BenefitCo, Inc. | Delaware | ||||
| MDU Energy Capital, LLC | Delaware | ||||
| Montana-Dakota Utilities Co. | Delaware | ||||
| Prairie Cascade Energy Holdings, LLC | Delaware | ||||
| Prairie Intermountain Energy Holdings, LLC | 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 | ||||