Aliso Canyon Well FailureOn October 23, 2015, a leak at a Southern California Gas Company natural gas storage well was discovered by crews at the Aliso Canyon Natural Gas Storage Facility. State agencies are working with SoCalGas and local agencies to monitor the situation and ensure public safety. On this page you will find information about the CPUC’s actions, and links to information that is available on other state agency websites, such as the Department of Conservation’s Division of Oil, Gas, and Geothermal Resources, which has primary jurisdiction over the Aliso Canyon wells. 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. Read our Summer and Winter Technical Assessments. Read our 715 Reports 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 Clean version, with additional reporting requirements Redline version, with additional reporting requirements 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 Read our Information Alert 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 December 10, 2019: CPUC reply letter November 1, 2019: Blade Root Cause Analysis Webinar Recording Webinar slides 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 November 8, 2019: CPUC reply letter 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 December 6, 2019: Resolution G-3560 Ratifying the Sept. 19, 2019 Executive Director Letter 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 CPUC Letter to Stakeholders and Parties Comments Received in Response to Draft Withdrawal Protocol and Energy Division Responses 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 Press Release Blade Video About Report Blade Report Supplemental Reports Volume 1: Approach Volume 2: SS-25 Well Failure Causes Volume 3: Post-22-25 Leak Events Volume 4: Aliso Canyon Casing Integrity CPUC and DOGGR Letter to SoCalGas Aug. 23, 2019: SoCalGas Response Letter 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. 11, 2019: Public Health Letter to SoCalGas Mar. 21, 2019: SoCalGas Letter to Public Health 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 Nov. 2, 2018: SoCalGas Winter 2018-19 Technical Assessment 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 CCST Presentation: Long-Term Viability of Underground Natural Gas Storage in California Video recording of the Workshop (on the CPUC's YouTube Channel) 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 Letter to SoCalGas SoCalGas Response SoCalGas Response Attachment Draft 715 Report Deadline Extension for 715 Report Comments View Comments May 22, 2018: Office of Environmental Health Hazard Assessment (OEHHA) Report and Well Control Fluid Data Potential Chemical Hazards Associated with the Well SS-25 Well-Control Materials at the Aliso Canyon Natural Gas Storage Facility Near Porter Ranch Well Control Fluid Data (data provided by SoCalGas) 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 5, 2018: Letter to CPUC from Senator Stern March 13, 2018: CPUC letter to SoCalGas re: Injection Required for SoCalGas Summer Reliability and Storage Inventories March 15, 2018: SoCalGas Reply March 19, 2018: CPUC Reply to SoCalGas April 20, 2018: Advice Letter 5275-A Requesting Approval of Second Injection Enhancement Plan May 10, 2018: Resolution G-3540 (SoCalGas AL 5275-A) 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 3, 2018: CPUC Reply 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 Public comment requested on this draft resolution. Comments are due Jan. 4, 2018. 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 CPUC directive to SoCalGas to maintain a range of working gas in the Aliso Canyon gas storage facility that ensures safety and reliability for the region, and just and reasonable rates in California. Jan. 9, 2018: Aliso Canyon Winter Risk Assessment Technical Report 2017-18 Supplement: January Situational Update Dec. 4, 2017: Senator Feinstein Letter Enclosure 1 Enclosure 2 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 Dec. 21, 2017: CPUC Response Nov. 28, 2017: Agencies Release Energy Assessment for SouthernCalifornia, Express Concern About Existing Pipeline Outages Aliso Canyon Winter Assessment Presentation on Winter Assessment 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 Nov. 2, 2017: 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. 30, 2017: SoCalGas Response 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 Sept. 1, 2017: DOGGR Response letter 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 See more information on DOGGR's website Enclosure 1: Department of Conservation DOGGR Updated Comprehensive Safety Review Findings 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 May 8, 2017: CPUC Response Letter to SoCalGas May 19, 2017: Advice Letter 5139 Requesting Approval of Injection Enhancement Plan June 29, 2017: Resolution G-359 (SoCalGas AL 5139) 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 March 30, 2017: SoCalGas Response Letter to CPUC March 16, 2017 Letter 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 Read our press release 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 DOGGR Public Notice 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 Phase 1 RCA Protocol: Blade Site Evidence Collection and Documentation Phase 2 RCA Protocol: SoCalGas Site restoration to Rig Readiness Phase 3 RCA Protocol: Blade Tubing, Casing, Wellhead Extraction 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 Attachment A (Fitness for Service Analysis) Attachment B Attachment C (Declaration of Mr. Schwecke) Attachment D (Confidentiality Request) DOGGR’s Acknowledgement of Request CPUC’s Acknowledgement of Request Statement from DOGGR on SoCalGas Request to Restart Injection at Aliso Canyon 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 May 2017 Update Sept. 20, 2016: CPUC Directive to SoCalGas to Conduct Internal Corrosion Threat Assessment Sept. 26, 2016: SoCalGas Response Appendix B to SoCalGas Response Confidentiality Declaration to SoCalGas Response Nov. 9, 2016: SoCalGas Response 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 Attachment to SoCalGas Letter - Proposed Tubing Flow Rate Verification Plan for 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 Attachment to letter (confidential information redacted) 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) CARE Tables Core Tables Non-Core Tables Total Tables 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: Action Plan 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 SoCalGas 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 Attachment 1 to Letter to Senator Hill Attachment 2 to 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. 29, 2016: SoCalGas Initial Response to CPUC/DOGGR Jan. 26 Request Jan. 26, 2016: CPUC Directive to Operators of Underground Gas Storage Facilities Survey Results 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. 22, 2016: SoCalGas Response Jan. 20, 2016: CPUC Letter to SoCalGas on Records Retention Response of SoCalGas to CPUC's Jan. 20, 2016 Letter on Records Retention SoCalGas Records Management and Retention Legal Policy Jan. 18, 2016: CPUC letter to SoCalGas re: Methane Capture System Proposal Jan. 15, 2016: SoCalGas Cost Update SoCalGas' spreadsheet from pdf 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 Jan. 5, 2016: CPUC response letter to PHMSA Dec. 23, 2015: CPUC Data Request to SoCalGas SoCalGas Response I to CPUC Dec. 23 Data Request SoCalGas Response II to CPUC Dec. 23 Data Request 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 Appendix A Appendix B Appendix C Dec. 14, 2015: CPUC/DOGGR Letter to SoCalGas SoCalGas’ supplemental response Dec. 14, 2015, Data Request providing an update as of Jan. 15, 2016 Aliso Incident Costs through Dec. 31, 2015 Dec. 14, 2015: CPUC Data Request to SoCalGas January 2016: SoCalGas Response to Dec. 14 Data Request SoCalGas' Aliso Canyon Costs as of November 30, 2015 Dec. 11, 2015: CPUC Data Request to SoCalGas Feb. 9, 2016: SoCalGas Response 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 Jan. 4, 2016: CPUC Response Letter to Senator Pavley Dec. 8, 2015: LA Weekly Public Records Request Dec. 4, 2015: Letter from City of Lancaster to CPUC Jan. 4, 2016: CPUC Response Letter to City of Lancaster Nov. 25, 2015: Letter from City of Los Angeles to CPUC Jan. 4, 2016: CPUC Response Letter to City of Los Angeles Nov. 23, 2015: Informal Complaint Nov. 4, 2015: Letter from EDF to CPUC Jan. 4, 2016: CPUC Response Letter to EDF 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