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10 Years Since Aliso Canyon: Disaster Was Wake-up Call for US on Dangers of Underground Gas

Debate continues over Aliso Canyon's future as regulators balance safety concerns with its role in supplying 40% of California's electricity, with capacity set to be reduced by 10 billion cubic feet.

  • On October 23, 2015, Well SS-25 at the Aliso Canyon underground gas storage facility began a nearly four-month leak that released 109,000 metric tons of methane and relocated 8,000 families.
  • Well SS-25 at Aliso Canyon, drilled in 1953 and repurposed for storage, failed due to external corrosion likely caused by groundwater contact, state regulators determined.
  • Researchers are conducting a $21 million UCLA-led Aliso Canyon Disaster Health Research Study, with early findings linking low birthweight to 666 exposed cases from over 1 million records.
  • CPUC staff recommended lowering the facility's maximum storage to 58.6 Bcf, but last December the CPUC board voted to keep Aliso Canyon operating for energy reliability and consumer price control.
  • The Porter Ranch Community Air Monitoring Project provides real-time methane data and sent an Oct. 3 alert later retracted; SoCalGas said it added safety measures, while nearly 36,000 plaintiffs sued.
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Los Angeles Times broke the news in Los Angeles, United States on Thursday, October 23, 2025.
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