On the Record · Northwest Natural Holding
Northwest Natural Holding subsidiaries, as it lists them
The subsidiaries Northwest Natural Holding lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| Northwest Natural Gas Company (dba NW Natural) | Oregon |
| Northwest Energy Corporation | Oregon |
| NWN Gas Reserves LLC | Oregon |
| NW Natural RNG Holding Company, LLC | Oregon |
| Lexington Renewable Energy LLC | Delaware |
| Dakota City Renewable Energy LLC | Delaware |
| SiEnergy Operating, LLC | Delaware |
| SiEnergy Holding, LLC (fka Si Investment Co, LLC) | Delaware |
| SiEnergy Gas, LLC (fka SiEnergy, LP) | Texas |
| SiEnergy Power Solutions, LLC | Texas |
| Pines Holdings, Inc. (fka Hughes Gas Resources, Inc.) | Texas |
| Pines Gas, Inc. (fka EPCOR Gas Texas Inc.) | Texas |
| Pines Gas Development, Inc. (fka EPCOR Gas Texas Development and Services Inc.) | Texas |
| T2 Transmission, LLC | Texas |
| Terra Transmission, LLC | Texas |
| NW Natural Energy, LLC | Oregon |
| NW Natural Gas Storage, LLC | Oregon |
| NNG Financial Corporation | Oregon |
| KB Pipeline Company | Oregon |
| NW Natural Renewables Holdings, LLC | Oregon |
| NW Natural Ohio Renewable Energy, LLC | Oregon |
| Marquette Renewable Energy, LLC | Oregon |
| Toledo Renewable Energy, LLC | Oregon |
| NW Natural Water Company, LLC | Oregon |
| Salmon Valley Water Company | Oregon |
| NW Natural Water of Oregon, LLC | Oregon |
| Sunstone Water, LLC | Oregon |
| Sunstone Infrastructure, LLC | Oregon |
| Sunriver Water LLC (dba Sunriver Utilities Company) | Oregon |
| Sunriver Environmental LLC | Oregon |
| Bents Court Water Company, LLC | Oregon |
| Emerald Valley Wastewater Company, LLC | Oregon |
| Lakeshore Water Company, LLC | Oregon |
| OMSID Infrastructure Holdings Company, LLC | Oregon |
| Seavey Loop Water Company, LLC | Oregon |
| South Coast Water Company, LLC | Oregon |
| NW Natural Water of Washington, LLC | Washington |
| Cascadia Water, LLC | Washington |
| Cascadia Infrastructure, LLC | Washington |
| Suncadia Water Company, LLC | Washington |
| Suncadia Environmental Company, LLC | Washington |
| NW Natural Water of Idaho, LLC | Idaho |
| Avimor Water Reclamation Company, LLC | Idaho |
| Falls Water Co., Inc. | Idaho |
| Gem State Water Company, LLC | Idaho |
| Gem State Infrastructure, LLC | Idaho |
| Quigley Recycled Water Company, LLC | Idaho |
| NW Natural Water of Texas, LLC | Texas |
| Blue Topaz Water, LLC | Texas |
| Blue Topaz Infrastructure, LLC | Texas |
| T & W Water Service Company (dba Blue Topaz Utilities) | Texas |
| NW Natural Water of Arizona, LLC | Oregon |
| Foothills Water & Sewer, LLC (dba Foothills Utilities) | Arizona |
| Rose Valley Water Company, Inc. | Arizona |
| Turquoise Infrastructure, LLC | Oregon |
| NW Natural Water of California, LLC | Oregon |
| Blue Diamond Infrastructure, LLC | Oregon |
| NW Natural Water Services, LLC (dba King Water Company (WA); dba Hiland Water (OR)) | Oregon |
| Puttman Infrastructure Services Company, LLC | Oregon |
| Mines Park Infrastructure Holdings Company, LLC | Colorado |
From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from Northwest Natural Holding’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-27. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.