EX-21 11 ex2112312024.htm EX-21

EXHIBIT 21

SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY

an Oregon Corporation

Name of Subsidiary						Jurisdiction Organized
Northwest Natural Gas Company (dba NW Natural)						Oregon
Northwest Energy Corporation(1)						Oregon
NWN Gas Reserves LLC(1)						Oregon
NW Natural RNG Holding Company, LLC(1)						Oregon
Lexington Renewable Energy LLC(1)						Delaware
Dakota City Renewable Energy LLC(1)						Delaware
SiEnergy Operating, LLC						Delaware
Si Investment Co, LLC						Delaware
SiEnergy, LP						Texas
SiEnergy GP, LLC						Texas
SiEnergy Power Solutions, 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
NW Natural Water Company, LLC						Oregon
Salmon Valley Water Company						Oregon

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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

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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

(1)Subsidiary of Northwest Natural Gas Company