Senate Bill 1221 Distribution System Mapping

Pursuant to Senate Bill (SB) 1221 (2024, Min) and the April 18, 2025 Assigned Commissioner’s Ruling Issuing Senate Bill 1221 Mapping Directions to Utilities (ACR) in Rulemaking (R.) 24-09-012, SoCalGas provides the following maps to support the determination of priority neighborhood decarbonization zones in compliance with the requirements and definitions contained therein. The gas and electric infrastructure and other data represented on these maps is not exhaustive and these maps should not be used for any purpose other than to support SB 1221 implementation.  Certain map layers required by the ACR are sourced from third parties and SoCalGas has attempted to incorporate this data as completely and accurately as possible. SoCalGas is not responsible for this third-party content or for any party’s use of, or reliance upon, such third-party content.¹ SoCalGas makes no warranties, express or implied, regarding the accuracy or quality of such third-party content.

Background on SB 1221 Maps

The ACR requires that SoCalGas provide maps containing information depicting ten years² of foreseeable distribution pipeline replacement projects identified in its distribution integrity management plan (DIMP) and further specifies that this should include at least 2,000 miles for SoCalGas.  It is unclear at this time whether 2,000 miles of distribution main could be replaced over this ten-year period.

Moreover, energy infrastructure may be subject to preventative maintenance and other ongoing investment, which is informed by several factors. In compliance with the ACR, the following maps contain information depicting where 2,000 miles of distribution main pipeline segments exist that have been identified using preliminary DIMP analyses for potential replacement. For many of these segments, a complete analysis including all factors that inform a DIMP investment plan is not available at the time of mapping, and therefore the segments depicted on these maps do not represent an actual replacement plan.  In addition to DIMP risk analyses, which are subject to change over time as conditions change and industry knowledge of risk factors evolves, pipeline replacement investments are optimized to maximize risk reduction and minimize cost through project bundling, project prioritization, and other considerations. Program budgets which ultimately support this replacement work are also contingent on regulatory approval.  As a result of these and potentially other reasons, significant variation between these maps and actual replacement investments may exist.

Consistent with the ACR’s requirement to map Potential and Foreseeable Gas Distribution Pipeline Replacement, SoCalGas has categorized mapped main segments in two tranches representing current estimates at the time of publication with the anticipated project replacement years and identified segments, which are subject to change:

• Planned Replacement: Main segments represented in the following maps which have the highest degree of replacement likelihood fall in this category and have been assigned a replacement year.  This assignment requires an initial segment-level risk assessment, a secondary risk aggregation assessment, execution planning and cost optimization, and budget certainty. As a result, these segments are limited to plans within our current general rate case cycle, which ends in 2027.  Projects in this category are therefore assigned a gas project year of “2026/2027.”
   
• Unknown Potential for Replacement: Remaining main segments required to satisfy the 2,000-mile requirement have been included based on preliminary risk assessment data but have not been further qualified for replacement and carry significant uncertainty regarding the timing and need for their replacement. These main segments have been assigned a gas project year of “TBD”

These maps have been initially provided on July 1, 2025, and will be updated annually, until at least July 1, 2029, pursuant to SB 1221 and PUC 661.

How to Use the SB 1221 Maps

By accessing the map, you will be able to navigate to the various features made available in compliance with the ACR. This data includes:

• Jurisdictional Boundaries (city, county, tribal lands, service territory) and Census Tracts within Utility Service Territories
• Potential and Foreseeable Gas Distribution Pipeline Replacement (aggregated at a census-tract level) including:
       o    Gas Utility
       o    Total length of identified pipelines within a given census, broken out by estimated replacement year and replacement program budget code
• Disadvantaged Communities including select attributes available from the Office of Environmental Health Hazard Assessment (OEHHA)
• Electricity Layers sourced from investor-owned electric utility (PG&E, SDG&E, and SCE) integration capacity analysis (ICA) maps

Additional information on these maps is available in the User Guide.

A data facilitator is available to assist parties, other jurisdictions, and members of the public in accessing and understanding these initial SB 1221 maps. This data facilitator can be reached SB1221maps@semprautilities.com.