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Mist Underground Gas Storage Facility

Facility: The permitted facility consists of underground natural gas storage reservoirs, compressor stations, gathering pipelines, operations and maintenance facilities, and a gas transmission pipeline. The permitted storage area is approximately 5,472 acres and has a permitted daily throughput of 635 million standard cubic feet.

Status (Operating): EFSC approved Amendment #11 at the April 21, 2016 Council meeting. Construction of the Amendment #11 components has not yet begun. Amendment #11 1) expanded the current site boundary to include an additional underground gas storage reservoir and gas transmission pipeline, 2) construct and operate a new gas-driven compressor station, and 3) construct and operate an underground pipeline to transport natural gas from the new compressor station and reservoir to the Port Westward Industrial Park.
Location: Columbia County, near the community of Mist. (Map)
Site certificate holder: Northwest Natural Gas Company
Contact Information
Project Point of Contact
Mike Hayward
Maxwell Woods
220 NW 2nd Ave.
625 Marion St. NE
Portland, OR 97209
Salem, OR 97301-3737
To Receive Updates by E-mail:
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About Oregon’s siting process:
·          For more information about Oregon’s siting process outlined in the table below, please go here.
Project Status (Table details will be updated as project progresses)
Amendment 11
Request for Amendment #11: An amendment may be requested to extend the deadline for beginning or completing construction. An amendment must also be requested to design, construct or operate a facility in a manner different from the description in the site certificate if the proposed change could 1) result in a not previously addressed significant adverse impact to a resource protected by Council standards, 2) impair the certificate holder’s ability to comply with site certificate conditions, or 3) require a new condition or change to a condition in the site certificate.
Exhibit A, General Information about the Applicant
Exhibit B, Project Description
Exhibit C, Location
Exhibit D, Organizational Expertise
Exhibit E, Permits
Exhibit F, Property Owners
Exhibit G, Materials Analysis
Exhibit H, Geology
Exhibit I, Soils
Exhibit J, Wetlands and Other Jurisdictional Waters
              (Part I)
              (Part II)
              (Part III)
Exhibit K, Land Use
Exhibit L, Protected Areas
Exhibit M, Financial Capability
Exhibit N, Need for the Facility
Exhibit O, Water Use
Exhibit P, Fish and Wildlife Habitat
Exhibit Q, Threatened and Endangered Species
Exhibit R, Scenic Resources
Exhibit S, Historic, Cultural, and Archaeological Resources
Exhibit T, Recreation
Exhibit U, Public Services
Exhibit V, Solid Waste and Wastewater
Exhibit W, Site Restoration
Exhibit X, Noise
Exhibit Y, Facility CO2 Emissions
Exhibit Z, Cooling Tower Plume (Not applicable)
Exhibit AA, EMF's - Electric and Magnetic Fields (Not applicable)
Exhibit BB, Other Information (Not applicable)
Exhibit CC, Additional Statutes, Rules and Ordinances
Exhibit DD, Specific Standards for surface Facilities Related to Underground Gas Storage Reservoirs
Nov. 13, 2015
Public Notice ​May 7, 2015
Deadline to submit public comments on the request for amendment #11
June 8, 2015
Request for Additional Information: Request from the department to the certificate holder to provide additional information that is required in order for the department to make findings on the Request for Amendment.
Request for Additional Information
Response to Request for Additional Information
To be determined
To be determined
Proposed Order: The proposed order includes recommended findings of fact, conclusions of law and conclusions regarding compliance with applicable Council standards.
Feb. 5, 2016
Deadline to submit public comments and requests for Contested Case on the proposed order
March 7, 2016
Council Review of Proposed Order and Contested Case Requests: After close of the public comment period, the Council reviews the proposed order and comments or requests for contested case. If there are no requests for contested case, or if the Council denies the contested case request(s), the Council may issue an amended site certificate (see Final Order and Site Certificate below).
Order approving or denying contested case
Apr. 21, 2016
To be determined
Contested Case: If the Council grants a contested case, the Council appoints an independent hearing officer to conduct the proceeding. The applicant and the Oregon Department of Energy are parties to the contested case. Other persons wanting to participate in the contested case proceeding must request party status from the hearing officer. Notice of contested case is sent only to those who participated in writing before the close of the proposed order public comment period.
Contested case
Hearing officer recommended contested case order
Final Order and Site Certificate: Following the comment period for the proposed order and any contested case proceeding, the council decides whether to issue an amended site certificate. The council grants an amended site certificate if at least four members of the Council agree that the amendment meets all council standards. The council issues its decision to amend the site certificate in a final order on the amendment.
Apr. 21, 2016
Apr. 21, 2016
Apr. 21, 2016
Project Status (Table details will be updated as project progresses)
Declaratory petition: Requests EFSC declare that expansion of the facility should be reviewed as amendment #11 of the existing facility rather than an application for a new site certificate.  Requests public notice be as set forth in OAR 345-027-0060
June 21, 2013
April 8, 2013
May 23, 2013
Consolidated site certificate (amendment #10): Consolidates all previous approved amendments into a single Consolidated Site Certificate.
June 9, 2008
May 30, 2008
Site certificate amendment #9: Authorizes increase to the allowed throughput to 515 million cubic feet per day (MMcfd), authorizes construction of improvements and installation of new dehydration facilities and gas quality and monitoring equipment; authorizes development of related and supporting facilities associated with new underground storage reservoirs, allows termination of vibration monitoring program created in Amendment #1.
Dec. 8, 2003
Dec. 5, 2003
Sept. 12, 2003
Site certificate amendment #8: Authorizes increase to the allowed throughput to 317 MMcfd, authorizes installation of one new injection/monitoring well and installation of new compressor subject to carbon dioxide standards at OAR 345 Division 24.
Nov. 14, 2001

Nov. 14, 2001
Aug. 16, 2001
Site certificate amendment #7: Authorizes increase to the allowed throughput from 190 MMcfd to 245 MMcfd.
Dec. 12, 2000
Nov. 27, 2000
Aug. 29, 2000
Site certificate amendment #6: Authorizes development of related and supporting facilities associated with new underground storage reservoirs, removes operating restrictions added in Amendment #4, adds new site certificate conditions associated with further development.
April 20, 1999
March 30, 1999
Sept. 15, 1998
Site certificate amendment #5: Replaces the amendment process set forth in section VII of the original Site Certificate with the process set forth in OAR Chapter 345 Division 27. Does not make all Division 27 rules applicable, but only those related to Site Certificate Amendment process.
March 17, 1998
March 13, 1998
Site certificate amendment #4: Enlarges the site boundary, authorizes development and upgrade of related and supporting surface facilities, authorizes development and operation of new connecting pipelines, adds new site certificate conditions.
July 21, 1997
July 21, 1997
March 20, 1997
Site certificate amendment #3: Allows for the replacement of two poorly functioning injection/withdrawal wells and the addition of two new wells to increase withdrawal capacity.
Sept. 21, 1990
Aug. 3, 1990
Site certificate amendment #2: Allows for the addition of one monitoring well.
Oct. 2, 1988
March 24, 1988
Site certificate amendment #1: Extends construction completion date, incorporates a monitoring program, adds notification requirements for certain events and clarifies other language.
Oct.  29, 1987
June 19, 1981
Sept. 30, 1981
Complete Application ​Feb. 5, 1981