> ## Content Index > Fetch the complete content index at: https://www.calregulatory.com/llms.txt > Use this file to discover other available public pages before exploring further. # SoCalGas Compliance Filing: One Inspection Anomaly Put 90% of San Diego County Gas Supply at Risk - URL: https://www.calregulatory.com/socalgas-compliance-filing-one-inspection-anomaly-put-90-of-san-diego-county-gas-supply-at-risk/ - Published: 2026-05-18T13:30:35.000Z - Updated: 2026-05-18T14:52:55.000Z - Author: MC - Tags: Line 3010, Line 7000, Line 247 Pursuant to **ALJ Ormond**'s [April 16 ruling](https://docs.cpuc.ca.gov/PublishedDocs/Efile/G000/M604/K937/604937767.PDF?ref=calregulatory.com) in [A.26-01-009](https://docs.cpuc.ca.gov/PublishedDocs/Efile/G000/M595/K083/595083702.PDF?ref=calregulatory.com), SoCalGas filed a compliance document cataloging a decade of transmission outages across three operational categories: (i) receipt capacity, (ii) system resiliency, and (iii) customer service. [A.26-01-009 SoCalGas Compliance Filing - Within TerritoryA.26-01-009 SoCalGas Compliance Filing - Within Territory.pdf273 KBdownload-circle](https://www.calregulatory.com/content/files/2026/05/A.26-01-009-SoCalGas-Compliance-Filing---Within-Territory.pdf "Download") Below is a summary of the filing. ### **RECEIPT CAPACITY** An October 2017 rupture on Line 235 triggered a parallel shut-in of Line 4000, collapsing Northern Zone firm receipt capacity from 1,590 MMcfd to **550 MMcfd** (a two-thirds reduction). Capacity did not fully recover until the end of 2023, more than six years later. SoCalGas ties that period directly to Aliso Canyon withdrawal restrictions, arguing that constrained storage compounded transmission stress in ways neither problem would have produced alone. ### **RESILIENCY & RELIABILITY** In June 2025, simultaneous stress corrosion cracking on Lines 4000 and 4002 cut Northern Zone capacity by **655 MMcfd** and severed Northern Zone support for the Southern Zone entirely, pushing Southern Zone customers onto Ehrenberg deliveries heading into winter. Following February 2024 atmospheric rivers, a landslide exposed and destabilized a long segment of Line 1005 north of Ventura. SoCalGas shut the line from the slide area to Ventura, and insufficient crossovers with parallel Line 1004 effectively removed Line 1005 from transmission operations until July 2025\. For about 17 months, a single pipeline carried all large gas supplies between Ventura and Goleta. A Line 1004 failure during that window would have left no transmission path to coastal California. In January 2024, a safety condition on Line 5000 (combined with the prior abandonment of a Line 2000 segment across the Morongo Band Reservation) left the Southern System dependent on a single pipeline through a critical corridor, eliminating more than half of Ehrenberg receipt capacity during peak winter demand. A late-October 2025 outage on Line 225 cut Wheeler Ridge Zone receipt capacity to **50 MMcfd** against nominal capacity of 765 MMcfd (approximately 6.5%) while reducing injection and withdrawal capacity at both Honor Rancho and La Goleta. [A December 27 landslide](https://www.socalgas.com/castaic-line-break-repair?ref=calregulatory.com) then severed Line 225 north of Honor Rancho. As of the filing date, the line remains out of service. ### **CUSTOMER SERVICE** SoCalGas identifies three pipelines as critical to entire geographic areas with no meaningful backup: - **Line 3010:** San Diego County - **Line 7000:** San Joaquin Valley communities north of Bakersfield - **Line 247:** coastal communities from Gaviota to San Luis Obispo A routine inspection anomaly on Line 3010 in August 2025 nearly took down the gas supply for California's second-most-populous county. An anomaly on the pipeline carrying about 90% of San Diego County's gas supply triggered a curtailment watch across all of SDG&E's service territory during peak summer demand. Had Line 3010 required shut-in, most of SDG&E's gas-fired generation (nearly 60% of the county's electricity portfolio) would have faced curtailment. Field inspection determined the line could safely remain in service while repairs proceeded. ### HURRICANE HILARY August 2023's [Hurricane Hilary](https://en.wikipedia.org/wiki/Hurricane%5FHilary?ref=calregulatory.com) hit all three categories at once. Storm damage to Lines 2000 and 2001 triggered a force majeure declaration and reduced Southern System receipt capacity by **200 MMcfd**. Flooding severed Line 6916, cutting service to Twentynine Palms (including the Marine Corps base) through November 3, 2023\. Storm exposure of Lines 6902 and 6001 in the Imperial Valley came within an inspection determination of disrupting gas service to the entire regional customer base, including an international wholesale customer in Mexicali. ### **INSTANT ANALYSIS** SoCalGas is asking the CPUC to stop treating transmission outages as isolated maintenance events and start treating them as a recurring operating condition for a large, aging system under mounting integrity and compliance obligations. The Line 3010 example is striking: one inspection anomaly on a pipeline serving about 90% of San Diego County's gas came close to curtailing most of the county's electric generation during August peak demand. The Northern Zone section shows what happens when storage constraints and transmission impairment arrive simultaneously. The Line 1005 and Line 5000 events show what happens when prior infrastructure decisions (Aliso Canyon restrictions, a right-of-way abandonment) eliminate redundancy that a later emergency would have needed. The Wheeler Ridge section shows what a single-pipeline zone looks like when that pipeline fails. The 10-year outage record makes a case that extends beyond A.26-01-009\. By documenting hundreds of events across three categories, SoCalGas is building the predicate for a larger proposition: aging infrastructure operating under heightened compliance demands requires redundancy, storage flexibility, and room to conduct maintenance without converting that maintenance into a reliability crisis.