Aliso Canyon Well Failure Order Instituting Investigation
Aliso Canyon Investigation
On February 9, 2017, the CPUC opened a proceeding (called an Order Instituting Investigation; I.17-02-002) to determine the feasibility of minimizing or eliminating the use of Southern California Gas Company’s Aliso Canyon Natural Gas Storage Facility while still maintaining energy and electric reliability for the Los Angeles region.
The purpose of the proceeding is to examine the long-term viability of the Aliso Canyon gas storage facility. The scope of the proceeding does not include the question of whether the facility should be reopened for injections, but rather the long-term feasibility of minimizing or eliminating the use of the facility while still maintaining energy and electric reliability for the Los Angeles region, consistent with maintaining just and reasonable rates.
Senate Bill 380 required the CPUC to open this proceeding no later than July 1, 2017, and to consult with the State Energy Resources Conservation and Development Commission, the California Independent System Operator, the local publicly owned utilities that rely on natural gas for electricity generation, the Division of Oil Gas and Geothermal Resources in the Department of Conservation (DOGGR), and relevant government entities, and others in making its determination. The CPUC expects and welcomes involvement and input from a wide range of interested entities to inform its decision-making process.
Visit the Docket Card (I.17-02-002) to view proceeding documents and make a comment on the proceeding.
- March 8, 2021: Phase 2 Energy Division Modeling Report (Unredacted Copy)
- February 3, 2021: Phase 2 Energy Division Modeling Report (Redacted Copy)
- November 2, 2020: Results of Econometric Modeling
- January 4, 2019: Scenarios Framework Final Version Adopted
- Commissioner Randolph and Administrative Law Judge Semcer issued a ruling adopting Scenarios Framework and Closing Phase 1 of Investigation 17-02-002.
- Jan. 14, 2019: Updated Appendix B
- September 14, 2018: Proposed Scenarios Framework Version 3
- Comments on Proposed Scenarios Framework Version 3
- June 15, 2018: Proposed Scenarios Framework Version 2
- Comments on Proposed Scenarios Framework Version 2
- October 4, 2017: Request for Proposal - Secondary: Notice to Prospective Proposers (RFP 17PS5004 for Aliso Canyon Economic Analysis - Addendum #1)
- August 22, 2017: Request for Proposal - Secondary: Notice to Prospective Proposers (Secondary RFP 16PS5016 - Aliso Canyon Reliability and Economic Analyses Addendum #2)
- June 26, 2017: Proposed Scenarios Framework Version 1
- Comments on Proposed Scenarios Framework Version 1
- June 15, 2017: Public Comment Requested for Aliso Canyon Reliability and Economic Analyses Draft Pre-Solicitation
- Feb 9, 2017: Press Release Opening Investigation
- Jan. 27, 2017: Press Release Announcing Investigation Proposal
- September 15, 2021: 2027 and 2035 Shortfall Memo
- February 3, 2021: Summary of Phase 2 Modeling Report
- June 8, 2020: Modeling Schedule Update
- May 27, 2020: Hydraulic Modeling Clarifications
- March 2020: Modeling Schedule Update
- October 2019: Modeling Schedule Update
- September 2019: Modeling Schedule Update
- August 2019: Modeling Schedule Update
- May 21, 2019: Winter 2018-19 SoCalGas Conditions and Operations Report
- May 2019: Modeling Schedule Update
- December 6, 2018: Winter 2017-18 SoCalGas Conditions and Operations Report
- IRP Datasets
- Energy Division slide decks and workshop materials for IRP events
- Proceeding Documents
- Testimony in Proceeding (choose “Supporting Document” from the Document Type dropdown menu and enter Proceeding Number I170200)
- Subscribe to Proceeding Documents
- Become a Party to the Proceeding
- Make Public Comment on the Proceeding: Email: firstname.lastname@example.org; Address: CPUC Public Advisor's Office, 505 Van Ness Ave., San Francisco, CA 94102
Background on Aliso Canyon Leak
On October 23, 2015, Aliso Canyon began to leak natural gas from its underground storage facility located near Porter Ranch, Calif. Upon discovery and reporting of the leak, multiple agencies began to work with Southern California Gas Company to remedy the situation and investigate its cause. On January 6, 2016, Governor Edmund G. Brown Jr. issued a proclamation declaring the gas leak an emergency and setting forth several orders to mitigate damage, including requiring Southern California Gas Company to maximize daily withdrawals of gas for use or storage elsewhere, a prohibition of any further injection into the storage facility until comprehensive review of the safety of the wells and the air quality of the surrounding community was completed, and ensuring that Southern California Gas Company bears responsibility for the costs related to the natural gas leak and strengthening oversight.
DOGGR has primary jurisdiction over the well and is focusing an investigation on the mechanical and operational condition of the well to determine the cause of well failure and the subsequent natural gas leak. The CPUC has jurisdiction over the above ground infrastructure beginning where the storage facility connects to the pipeline, or “at the wellhead.” In addition, the CPUC has jurisdiction over the recovery of costs related to the storage facility as well as ensuring that Southern California Gas Company provides safe, reliable service at just and reasonable rates.
The CPUC and DOGGR are conducting their respective investigations in parallel as part of a collaborative effort. The CPUC and DOGGR jointly directed Southern California Gas Company to retain an independent, third-party to perform a technical root cause analysis of the well to protect against future failures. At the conclusion of the investigation, the CPUC will have several enforcement options, depending upon what violations, if any, are identified. The options can include issuance of a staff Citation or opening a formal CPUC proceeding to consider fines and penalties.
The CPUC will address costs and cost responsibility related to the leak in a future proceeding. On December 23, 2015, the CPUC sent a letter to Southern California Gas Company directing it to track all costs associated with its actions related to the leaking well and to make that cost information publicly available.
FTI Presentation (original sent to service list) (revised posted April 2)
FTI Hydraulic Modeling Information
- This information is redacted per SoCalGas’ request. Parties to the proceeding may request the unredacted versions if they have Non-Disclosure Agreements with SoCalGas.
- Hydraulic Model Data Documentation
- Base 2027 Model Assumptions and Results
- Base 2035 Model Assumptions and Results
- Replica of CPUC SIM 01 Midnight Model - Model Data
- Summary Demand Table (2027 and 2035)
- Center for Energy Efficiency and Renewable Technologies
- Indicated Shippers
- Protect Our Communities Foundation
- Southern California Public Owned Utilities