The Aliso Canyon Natural Gas Storage Facility (Aliso Canyon), located in the Santa Susana Mountains of Los Angeles County, is the largest natural gas storage facility in California. Southern California Gas Company (SoCalGas) crews discovered a leak at a natural gas storage well at Aliso Canyon on October 23, 2015. After several attempts, SoCalGas stopped the leak on February 12, 2016, sealing the well on February 15, 2016. It was subsequently plugged and abandoned. More information on the well kill attempts can be found here.
On July 19, 2017, after inspection and analyses of all the wells at Aliso Canyon, the CPUC, along with the California Geologic Energy Management Division (CalGEM, formerly known as the Department of Conservation’s Division of Oil, Gas, and Geothermal Resources, or DOGGR), determined that the facility was safe to operate, and it was reopened at a reduced capacity. CalGEM, which has primary jurisdiction over Aliso Canyon’s underground facilities, determined the maximum allowable operating pressure in the field to be 2,926 psi, which translates to an inventory of 68.6 billion cubic feet (Bcf) of natural gas. This is a 17.4 Bcf reduction compared to Aliso Canyon’s pre-leak capacity of 86 Bcf. More information on CalGEM’s Aliso Canyon work can be found here.
In accordance with the direction provided by the legislature in California Public Utilities Code Section 715, the CPUC determines the inventory needed "to ensure safety and reliability for the region and just and reasonable rates in California.” The CPUC makes this determination in its “715 Reports,” which are known more formally as the Aliso Canyon Working Gas Inventory, Production Capacity, Injection Capacity, and Well Availability for Reliability Reports. In its last 715 Report, updated on July 6, 2018, the CPUC capped Aliso Canyon’s maximum allowable inventory at 34 Bcf.
The CPUC also develops the Aliso Canyon Withdrawal Protocol, which is a protocol describing the process to be followed before making a withdrawal from the Aliso Canyon storage facility. The Withdrawal Protocol is developed with input from the California Energy Commission (CEC), the California Independent System Operator (CAISO), and the Los Angeles Department of Water and Power (LADWP), together known as “the Joint Agencies.”
The CPUC works closely with the Joint Agencies to monitor the availability of natural gas in Southern California, protect public safety, and ensure energy reliability in the region. Since 2016, the CPUC has worked with the Joint Agencies to develop Summer and Winter Technical Assessments that assess energy reliability challenges in Southern California in the coming season. The CPUC also periodically creates Southern California Conditions and Operations Reports that look back on various seasonal reliability events.
On our investigation webpage you can find information on the proceeding we opened on Feb. 9, 2017 (called an Order Instituting Investigation; I.17-02-002) to determine the feasibility of minimizing or eliminating the use of Aliso Canyon.
On this page you will find information about the CPUC’s actions and links to information that is available on other state agency websites in reverse chronological order.
- October 19, 2020: Winter 2020-21 SoCalGas Technical Assessment
- October 13, 2020: Aliso Canyon Withdrawals in August
- August 5, 2020: Aliso Canyon Withdrawals in July
- August 4, 2020: I.17-02-002 Phase 3 – Expert Consultant Statement of Work and Proposal
- The CPUC has executed a contract for an expert consultant. See November 18, 2019 document below for more information.
- July 20, 2020: Summer 2019 SoCalGas Conditions and Operations Report
- May 15, 2020: SoCalGas Request for Authorization for Limited Withdrawal at Aliso Canyon to Perform Cleanup Flow Activities of Inspected Wells
- May 5, 2020: Aliso Canyon Withdrawals in April
- April 15, 2020: Summer 2020 Southern California Reliability Assessment
- April 2, 2020: Energy Division Responses to Questions About Various Aliso Canyon and System Capacity Topics
- April 1, 2020: SoCalGas Summer 2020 Technical Assessment
- April 1, 2020: Aliso Canyon Withdrawal Protocol
- March 4, 2020: Aliso Canyon Withdrawals
- February 5, 2020: Aliso Canyon Withdrawals
- January 6, 2020: Aliso Canyon Withdrawals
- January 6, 2020:Winter 2018-19 SoCalGas Conditions and Operations Report
- December 5, 2019: CPUC’s Safety and Enforcement Division Testimony Alleges Violations by SoCalGas in Aliso Canyon Leak
- December 4, 2019: Aliso Canyon Withdrawals in November
- November 18, 2019: Letter to CPUC President Batjer from Governor Newsom re: Request additional action by the CPUC
- November 1, 2019: Blade Root Cause Analysis Webinar Recording
- October 24, 2019: 2018-2019 Winter Load Impact Evaluation of SoCalGas Smart Therm Program (Demand Response)
- October 24, 2019: Winter 2019-20 Southern California Reliability Assessment
- October 22, 2019: Letter to CPUC from Senator Stern and Assemblymember Christy Smith re: Investigation pursuant to Senate Bill 380
- October 8, 2019: SoCalGas Winter 2019-20 Technical Assessment
- Sept. 19, 2019: CPUC Letter to SoCalGas re: Injection Required for Winter Reliability and Storage Inventory
- Aug. 2, 2019 Webcast: On August 2, 2019, from 10–11 a.m., Blade Energy Partners will host a webinar on how they collected the data and the key results of their Root Cause Analysis (see the May 17 bullets below). After the presentation there will be a question and answer period open to all the attendees. More information, including the webinar link: http://www.blade-energy.com/press-releases/
- July 23, 2019: CPUC Letter to SoCalGas re: Aliso Canyon Withdrawal Protocol
- July 1, 2019: Draft Aliso Canyon Withdrawal Protocol
- CPUC Letter re: Aliso Canyon Withdrawal Protocol
- This document provides proposed revisions to the process to be followed before making a withdrawal from the Aliso Canyon storage facility. You may provide comments on the draft Withdrawal Protocol for Energy Division to consider by e-mailing Aliso@cpuc.ca.gov. Comments must be submitted by 5:00 PST on Thursday, July 11.
- June 27, 2019: CPUC Opens Investigations into Sempra for Safety Issues
- May 17, 2019: Blade Root Cause Analysis Report Issue
- May 2019: Background on Aliso Canyon and Actions to Date
- May 2019: Root Cause Analysis of Aliso Canyon Well Leak Expected Soon
- Apr. 4, 2019: SoCalGas Summer 2019 Technical Assessment
- Mar. 29, 2019: CPUC Letter to SoCalGas re: Los Angeles County Department of Public Health Request for Data
- Mar. 15, 2019: Blade Energy Partner's update RCA Estimated Completion date
- Mar. 13, 2019: PRNC Letter to the CPUC
- Mar. 11, 2019: Aliso Canyon Withdrawal Notification
- Mar. 5, 2019: Aliso Canyon Withdrawal Notification
- Feb. 27, 2019: Aliso Canyon Withdrawal Notification
- Feb. 26, 2019: Letter to CPUC from SoCalGas re: Winter 2018-19 Lessons Learned
- Feb. 10, 2019: Aliso Canyon Withdrawal Notification
- Feb. 4, 2019: Aliso Canyon Withdrawal Notification
- Jan. 25, 2019: SoCalGas IEPR comments and Explanation of Pipeline Capacity Reductions and Outages
- SoCalGas has begun posting work progress notices to ENVOY. Please check ENVOY for updates.
- Jan. 22, 2019: Aliso Canyon Withdrawal Notification
- Jan. 15, 2019: Aliso Canyon Withdrawal Notification
- Jan. 8, 2019: SoCalGas Letter to CPUC re: Status of Southern California Gas Company's (SoCalGas) Underground Natural Gas Storage Levels and Use of Aliso Canyon
- Jan. 2, 2019: Aliso Canyon Withdrawal Notification
- Dec. 6, 2018: Winter 2017-18 SoCalGas Conditions and Operations Report
- Oct. 30, 2018: PRNC Letter to the CPUC
- Oct. 25, 2018: CPUC Approves Continuation of Smart Thermostat Program for SoCalGas to Support Reliability; Newly Enrolled Customers Can Receive Up To $75 for Participation
- Oct. 10, 2018: 2018-19 Joint Agencies Winter Risk Assessment Technical Report Supplement
- Sept. 5, 2018: CPUC Letter to SoCalGas re: Aliso Canyon WIthdrawal Protocol
- Sept. 5, 2018: Blade RCA Sept 2018 Estimated Timeline
- Aug. 28, 2018: CPUC - California Council on Science And Technology Workshop On Natural Gas Storage Fields In California
- July 19. 2018: Joint CPUC and DOGGR Letter to SoCalGas re: Casing and Tubing Removed from Aliso Canyon
- July 11, 2018: CPUC Letter to SoCalGas Memorializing Company's Failure to Cooperate with Safety and Enforcement Division in its Preliminary Investigation
- July 2, 2018: CPUC Letter to SoCalGas re: Directive to Maintain a Range of Working Gas in the Aliso Canyon Gas Storage Facility
- July 2, 2018: Aliso Canyon Working Gas Inventory, Production Capacity, Injection Capacity, and Well Availability for Reliability - Summer 2018 Supplemental Report (July 6, 2018 update)
- June 18, 2018: CPUC to Review SoCalGas Pipeline Outages That Contribute to Recommendation to Increase Aliso Canyon Gas Storage Volume
- May 22, 2018: Office of Environmental Health Hazard Assessment (OEHHA) Report and Well Control Fluid Data
- May 7, 2018: Aliso Canyon Mitigation Measures Impact Report (May 2018 Update)
- May 7, 2018: 2018 Summer Risk Assessment Technical Report
- April 4, 2018: ALJ Ruling on Contract with Los Alamos and Hydraulic Modeling
- April 3, 2018: SoCalGas Aliso Canyon Withdrawal Protocol 30-Day Report
- March 13, 2018: CPUC reply letter to Senator Stern regarding CPUC March 3 letter from Energy Division to SoCalGas
- March 13, 2018: CPUC letter to SoCalGas re: Injection Required for SoCalGas Summer Reliability and Storage Inventories
- March 12-16, 2018: Blade AC-RCA Phase 4 Projected Work Plan
- March 6, 2018: Aliso Canyon Withdrawal Notification
- March 2, 2018: SoCalGas Letter to CPUC re: Underground Natural Gas Storage and System Reliability Assessment for the Week of March 5, 2018
- March 1, 2018: Aliso Canyon Withdrawal Notification
- Feb. 25, 2018: Aliso Canyon Withdrawal Notification
- Feb. 23, 2018: Aliso Canyon Withdrawal Notification
- Feb. 21, 2018: Aliso Canyon Withdrawal Notification
- Feb. 19, 2018: Aliso Canyon Withdrawal Notification
- Feb. 15, 2018: Blade RCA SS-25 Metallurgical Protocol - Phase 4 RCA
- Feb. 15, 2018: Blade RCA 2-15-18 Estimated Timeline
- Dec. 15, 2017: Draft Resolution - Emergency Order Directing Southern California Gas Company to Implement a Moratorium on New Natural Gas Service Connections
- Dec. 11, 2017: Aliso Canyon Working Gas Inventory, Production Capacity, Injection Capacity, and Well Availability for Reliability Report (715 Report) - Final Supplemental Report for Winter 2017-18
- Dec. 4, 2017: Senator Feinstein Letter
- Dec. 4, 2017: CPUC and CEC Letter to L.A. County Board of Supervisors 5th District
- Nov. 30, 2017: Draft Update to Aliso Canyon Working Gas Inventory, Production Capacity, Injection Capacity, and Well Availability for Reliability Report (715 Report)
- Statute requires the CPUC to seek public comment on this report. Members of the public can comment on the report via email to Aliso@cpuc.ca.gov. These comments should include "715 Report" in the subject line. Comments are due by close of business on Dec. 6, 2017. Public comments received will help further inform the CPUC about reliability issues related to Aliso Canyon.
- SoCalGas Comment on Report
- Nov. 29, 2017: SoCalGas Request for Clarification on SoCalGas Rule 23 and the Aliso Canyon Withdrawal Protocol
- Nov. 28, 2017: Agencies Release Energy Assessment for SouthernCalifornia, Express Concern About Existing Pipeline Outages
- Nov. 28, 2017: Save Gas This Winter
- Nov. 14, 2017: CPUC Letter to SoCalGas re: Approval of SCG's Request for Authorization to Perform Flow Testing on Specified Wells at Aliso Canyon Storage Field
- Nov. 16, 2017: CPUC Letter to SoCalGas re: Clarification of Intent of March 16, 2017, Letter from Executive Director
- Nov. 13, 2017: CPUC and CEC Letter to FERC re: SoCalGas Letter
- Nov. 2, 2017: CPUC Letter to SoCalGas re: Aliso Canyon Withdrawal Protocol
- Oct. 30, 2017: CPUC Letter to SoCalGas re: Affiliate Transactions to Support Gas Flows to Otay Mesa
- Oct. 18, 2017: Blade Work Plan - Aliso Canyon RCA: SS-25 Tubing and Wellhead Logistics
- Oct. 18, 2017: Blade SS-25 Phase 3 Wellsite Equipment Handling Protocol for Houston, TX Warehouse
- Oct. 18, 2017: Blade Estimated Timeline
- Oct. 18, 2017: Draft Aliso Canyon Withdrawal Protocol that describes the process to be followed before making a withdrawal from the Aliso Canyon storage facility; a finalized protocol will be posted on Oct. 31, 2017, and will be effective Nov. 1, 2017.
- Oct. 17, 2017: CPUC and CEC Letter to SoCalGas
- Oct. 5, 2017: Blade Phase 3A Contingency Summary Steps
- August 28, 2017: SoCalGas letter to DOGGR and CPUC re: Aliso Canyon Daily Reservoir Pressure Estimates, Daily Injection and Withdrawal Volume Measurements, and Average Daily Tubing and Annulus Pressure Measurements
- July 31, 2017: Blade RCA: SS‐25 Phase 3 Wellsite Tubulars Handling Protocol
- July 27, 2017: Scientific Aviation Report on Aliso Canyon Natural Gas Leak Measurement
- July 21, 2017: Summary On The Operational Constraints at Aliso
- July 19, 2017: CPUC DOGGR Press Release: State Inspections Confirm Safety of Aliso Canyon
- July 19, 2017: DOGGR/CPUC Letter to SoCalGas and Public
- July 19, 2017: CPUC Letter to DOGGR re: SB 380 Concurrence Letter – Findings
- July 19, 2017: CPUC Letter to SoCalGas re: Directive to Maintain a Range of Working Gas That Ensures Safety and Reliability
- July 19, 2017: CPUC Revised Report - Aliso Canyon Working Gas Inventory, Production Capacity, Injection Capacity, and Well Availability for Reliability
- July 19, 2017: California Energy Commission letter to CPUC Urging the Future Closure of Aliso Canyon
- July 14, 2017: PHMSA Letter to SoCalGas
- June 16, 2017: CPUC Letter to SoCalGas re: Aliso Canyon Summer 2017 Withdrawals
- June 16, 2017: Public Comment Requested for Aliso Canyon Reliability and Economic Analyses Draft Pre-Solicitation
- 2017: 2017 SS-25 Daily Site Action Plans
- 2016: 2016 SS-25 Daily Site Action Plans
- May 2017: Aliso Canyon Demand-Side Resource Impact Report Update
- May 22, 2017: Documents from Joint Agency Workshop on Energy Reliability in Southern California
- May 22, 2017: Presentations from Joint Agency Workshop on Energy Reliability in Southern California
- May 2017 Update: Aliso Canyon Demand-Side Resource Impact Report
- May 9, 2017: SS25A Well Work Plan
- April 29, 2017: SS-25A Wellsite Tubulars Handling Protocol
- April 28, 2017: SS 25A Fluid Sampling and Analysis Protocol
- April 28, 2017: SoCalGas Letter to CPUC, ISO, and Energy Commission
- April 27, 2017: Operations Plan for SS25A
- April 21, 2017 to August 16: 2017 Daily Site Action Plans
- March 2017: Aliso Canyon SS25 Well Leak Investigation Overview
- March 30, 2017: CPUC to Hold Hearings in its Proceeding to Consider Future of Aliso Canyon Natural Gas Storage Facility
- March 29, 2017: DOGGR Letter to SoCalGas
- March 16, 2017:CPUC Letter to SoCalGas re: Storage Safety Enhancement Plan
- Feb. 15, 2017: SoCalGas Letter to CPUC re: Storage Safety Enhancement Plan
- Feb. 10, 2017: DOGGR/CPUC Letter to SoCal Gas on Well Standard Sesnon 25 - Review of Proposed Operations
- Feb. 9, 2017: CPUC to Consider Future of Aliso Canyon Natural Gas Storage Facility
- Feb. 1, 2017: CPUC Aliso Canyon Public Meeting Presentation
- Jan. 27, 2017:OII Issued that Sets Stage for Commissioner Consideration of Future of Aliso Canyon
- Jan. 2017: Aliso Canyon Demand-Side Management Impact Summary
- Jan. 24, 2017: SED Directive to SoCalGas to Conduct Leak Survey
- This Winter Withdrawal Protocol describes the process to be followed before making a withdrawal from the Aliso Canyon storage facility. The protocol was developed by the CPUC, the California Independent system Operator, and Los Angeles Department of Water and Power, with input from the California Energy Commission. The protocol revised the summer protocol, in recognition of the differences in the conditions that make up winter demand versus summer demand.
- Jan. 17, 2017: News Release - Public Invited To Comment On Safety Findings And Proposed Restrictions At Aliso Canyon
- Jan. 17, 2017: Aliso Canyon Storage Facility comprehensive gas storage well safety review and related documents and information are available on DOGGR’s website
- Jan. 17, 2017: The proposed minimum and maximum pressure for the Aliso Canyon Storage Facility and related documents and information are available on DOGGR’s website
- Jan. 17, 2017: Draft Update to Aliso Canyon Working Gas Inventory, Production Capacity, Injection Capacity, and Well Availability for Reliability Report
- Jan. 13, 2017: SoCalGas Notice Pursuant to PU Code Section 455.5
- Dec. 19, 2016: Memorandum of Understanding Between CPUC and DOGGR
- Nov. 14, 2016: Aliso Canyon
- Nov. 10, 2016: CPUC Authorizes Winter Conservation Programs For SoCalGas Customers
- Nov. 8, 2016: Veritas Report on Failure Analysis of Leak in Well Line from Aliso Canyon Natural Gas Storage Facility
- Nov. 1, 2016: Letter from SoCalGas requesting authorization for reinjection
- Oct. 25, 2016:Aliso Canyon SS25 Well Leak Investigation Overview
- Oct. 21, 2016: CPUC/DOGGR Letter to SoCalGas re: Safety Review for Underground Gas Storage Facilities at Aliso Canyon
- Oct. 21, 2016: The Internal Corrosion Assessment that SoCal Gas submitted
- Oct. 18, 2016: Federal Interagency Task Force on Underground Natural Gas Storage Safety Report: Ensuring Safe and Reliable Underground Natural Gas Storage
- Sept. 28, 2016: CPUC Letter to SoCalGas
- Sept. 27, 2016: Aliso Canyon Demand Side Management Activity and Impact Summary
- Sept. 20, 2016: CPUC Directive to SoCalGas to Conduct Internal Corrosion Threat Assessment
- Sep. 13, 2016: Letter from Energy Division Director to SoCalGas re Directing SoCalGas to File Winter Demand Response Programs for the Winter of 2016
- Aug. 25, 2016: CPUC Letter to SoCalGas Re: Authorization to Isolate and Remove from Service Wells Reserved for Withdrawal at Aliso
- Aug. 24, 2016: CPUC Letter to SoCalGas re: Authorization to Continue Flow Testing on Specified Wells
- Aug. 26 Workshop Notice to Discuss Action Plan to Preserve Southern California Energy Reliability This Winter
- Aug. 22, 2016: Energy Agencies Release Action Plan to Preserve Southern California Energy Reliability This Winter
- Aug. 18, 2016: CPUC approves contracts for SDG&E in continued support of the Governor’s Emergency Proclamation to protect public safety by ensuring the continued reliability of natural gas and electric supplies while there is a moratorium on gas injections at Aliso Canyon Natural Gas Storage Facility
- Aug. 3, 2016: Authorization of Gas Reinjection at PG&E's McDonald Island
- Aug.1, 2016: CPUC Response Letter to SoCalGas July 28, 2016 Letter
- July 28, 2016: Letter from SoCalGas - Authorization to Perform Flow Testing on Specified Wells at Aliso Canyon
- June 28, 2016: CPUC Issues Staff Report on Aliso Canyon Gas Availability and Reliability
- June 20, 2016: SoCalGas letter to CPUC regarding testing
- June 15, 2016: CPUC Letter to SoCal Gas re Aliso Canyon Natural Gas Storage Facility comprehensive safety testing
- June 15, 2016: DOGGR letter on Aliso Canyon Withdrawal Authorization
- June 2, 2016: Summer 2016 Aliso Canyon Withdrawal Protocol
- May 26, 2016: CPUC Continues to Plan for Southern California Energy Reliability by Approving Storage Procurement for Edison
- May 12, 2016: Resolution issued for comment authorizing expedited procurement of storage resources to ensure electric reliability in the Los Angeles Basin due to limited operations of Aliso Canyon Gas Storage Facility
- May 6, 2016: Disposition approving proposed amendments to the California Solar Initiative-Thermal Program Handbook. The changes will only apply to solar water heating installations in SoCalGas service territory and will be temporary in order to respond to the major natural gas leak that occurred at the Aliso Canyon Natural Gas Storage Facility on October 23, 2015.
- May 6, 2016: CPUC Letter to Edison on Accelerated Procurement to Address Reliability Risks Associated with the Moratorium on Injections into the Aliso Canyon Natural Gas Storage Facility
- 2015 SoCal Gas Usage Data (by high, medium and low usage)
- April 21, 2016: CPUC Continues to Support Conservation Efforts to Ensure Reliable Energy to Southern California Following Aliso Canyon Leak
- April 8, 2016: Energy Agencies Hold Workshop to Discuss Action Plan to Preserve Energy Reliability in Greater Los Angeles
- April 5, 2016: Risk Assessment Technical Report
- April 5, 2016: Energy Agencies Release Draft Action Plan to Preserve Energy Reliability in Greater Los Angeles This Summer in Wake of Aliso Canyon Leak
- April 8, 2016: Joint Agency Workshop: Aliso Canyon Action Plan for Local Energy Reliability in Summer 2016
- April 5, 2016: Key Energy Agencies Release Aliso Canyon Action Plan on Natural Gas Reliability for Greater Los Angeles Area
- March 23, 2016: Assigned Commissioner’s Ruling on Demand Response
- March 14, 2016: CPUC Issues Commissioner Ruling Directing SoCalGas and Edison to Enhance Energy Savings Assistance Program Efforts
- February 2016: SoCalGas Rates Fact Sheet
- Feb. 16, 2016: Preliminary CPUC Staff Analysis of Los Angeles Basin’s 2016 Energy Demand and the Role of Aliso Canyon Storage
- Feb. 11, 2016: Letter to Senator Hill
- Feb. 5, 2016: CPUC Staff Directive to SoCalGas to Preserve Evidence
- Feb. 4, 2016: Aliso Canyon Reliability Briefing to the Porter Ranch Community Advisory Committee by CPUC Energy Division Director
- Feb. 1, 2016: CPUC/CEC/CAISO Letter to the Governor
- Jan. 26, 2016: CPUC/DOGGR Request for Information from SoCalGas
- Jan. 26, 2016: CPUC Directive to Operators of Underground Gas Storage Facilities
- Jan. 22, 2016: CPUC Letter to SoCalGas on Selection of 3rd Party Contractor
- Jan. 21, 2016: Letter from Congressman Sherman to CAISO and CPUC
- Jan. 21, 2016: Letter from Congressman Sherman to the CPUC on Electric Reliability
- Jan. 21, 2016: Testimony of CPUC Safety and Enforcement Division Director, Elizaveta Malashenko
- Jan. 21, 2016: CPUC Letter to SoCalGas on Working Gas Level
- Jan. 20, 2016: CPUC Letter to SoCalGas on Records Retention
- Jan. 18, 2016: CPUC letter to SoCalGas re: Methane Capture System Proposal
- Jan. 15, 2016: SoCalGas Cost Update
- Jan. 14, 2016: CPUC Data Request to SoCalGas
- Jan. 13, 2016: Letter to the CPUC from Assemblymember Gatto, Chair, Assembly Utilities and Commerce Committee on Records Retention
- Jan. 11, 2016: Greenpeace Public Records Request
- Jan. 4, 2016: CPUC directive to SoCalGas to provide district call center information and perform area leak surveys
- Dec. 24, 2015: PHMSA letter to CPUC
- Dec. 23, 2015: CPUC Data Request to SoCalGas
- Dec. 23, 2015: CPUC Letter to SoCalGas re: Costs
- Dec. 21, 2015: Aguirre & Severson Public Records Request
- Dec. 17, 2015:Al Jazeera America Public Records Request
- Dec. 15, 2015: Frantz Law Group Public Records Request
- Dec. 15, 2015: Bloomberg News Public Records Request
- Dec. 15, 2015: State Agencies Detail Ongoing Investigations into Aliso Canyon Gas Leak
- Dec. 15, 2015: CPUC/DOGGR Joint Statement on Investigations
- Dec. 14, 2015: CPUC/DOGGR Letter to SoCalGas
- Dec. 14, 2015: CPUC Data Request to SoCalGas
- Dec. 11, 2015: CPUC Data Request to SoCalGas
- Dec. 9, 2015: Overview of Phone Conversation
- Dec. 9, 2015: Letter from Senator Pavley to DOGGR and CPUC
- Dec. 9, 2015: Letter from Senator Pavley to CPUC and DOGGR
- Dec. 8, 2015: LA Weekly Public Records Request
- Dec. 4, 2015: Letter from City of Lancaster to CPUC
- Nov. 25, 2015: Letter from City of Los Angeles to CPUC
- Nov. 23, 2015: Informal Complaint
- Nov. 4, 2015: Letter from EDF to CPUC
- Oct. 27, 2015: Informal Complaint
- Oct. 25, 2015: Incident Report Notification of Leak
- Aug. 25, 2014: CPUC Incident Investigation Report
- May 15, 2014: CPUC Incident Investigation Report
- Feb. 15, 2011: Informal Complaint
- Apr. 11, 2008: CPUC Incident Investigation Report
- Nov. 29, 2007: CPUC Letter to SoCalGas
- Oct. 18, 2006: CPUC Letter to SoCalGas
- SoCalGas Aliso Canyon Emergency Action and Fire Prevention Plan
- Visit the SoCalGas website for more information.
- Visit the CalOES website for more information.
- Read the CPUC’s Memorandum of Understanding with DOGGR
- Overview of SoCalGas System Operations and Aliso Canyon SS-25 Incident
- Pressures in a Well Fact Sheet
- Map of California Storage Fields and Capacity
- FAQs for Aliso Canyon