Aliso Canyon Storage Facility

Learn more about the infrastructure, technology, and safety enhancements at Aliso Canyon.

Comprehensive Safety Review

As a result of comprehensive testing, physical changes, and the establishment of tubing flow only, SoCalGas® has demonstrated that Aliso Canyon storage facility is safe to resume injection operations. As part of the State’s Comprehensive Safety Review, developed by the Division of Oil, Gas and Geothermal Resources (DOGGR) in consultation with independent technical experts from the Lawrence Berkeley, Lawrence Livermore, and Sandia National Laboratories, DOGGR and the California Public Utilities Commission (CPUC) will determine if SoCalGas is authorized to resume injection operations. In contrast, the Root Cause Analysis will determine the specific mode and mechanics that caused the failure in the casing at the SS-25 well site.

The ability to resume injections at Aliso Canyon is critical to the reliability of the region’s natural gas and electricity systems. There is no dependency on or need to wait for the results of the Root Cause Analysis. SoCalGas has demonstrated that the field is safe to resume injection operations. 

To date, 49 storage wells at the Aliso Canyon Storage facility have passed all of the tests required under DOGGR's Comprehensive Safety Review. In compliance with the Safety Review, the remaining wells have been temporarily and mechanically sealed off from the storage reservoir.

In addition to being mechanically sealed and isolated from the pressure in the field, wells that are temporarily sealed are filled with fluid to provide a second barrier of protection. Daily observation of these temporarily sealed wells will continue and they are also being monitored in real time for pressure changes. A video explaining this process is available here.

Wells that have been temporarily and mechanically sealed will either complete the second phase of required testing or be permanently sealed and taken out of service, per regulation.