Costs of Gas Distribution Replacement

Background

Gas Distribution Infrastructure Replacement Backgrounder

This backgrounder provides high-level information about gas distribution infrastructure replacement and its costs. 

Calculating Avoided Gas Replacement Costs: 

The CPUC’s Energy Division provides this template for calculating the average avoided gas replacement costs that could be saved by a decarbonization project.  

• Avoided Gas Replacement Costs Template (template xlsx, MockExample xlsx) 
• Ruling issuing this template and requesting party comments on it by September 18, 2026, and reply comments by October 2, 2026 

This template relies on the utility data discussed below.

Cost data provided by utilities to the CPUC:

These detailed cost documents are presented here as they were submitted to the CPUC by the gas utilities. They include revisions to the documents that utilities provided to the R.24-09-012 service list on November 5, 2025.

If you have questions about the data linked here, please direct them to the utility contacts found in the Cover Descriptions. 

Pacific Gas & Electric 

• Distribution Replacement Costs Data (xlsx)
• Regulator Station Replacement Costs Data (xlsx)
• Maintenance Costs (xlsx)
• Cover Description (pdf) (availability pdf) (update pdf) (availability update)

Southern California Gas Company

• Distribution Replacement Costs Data (xlsx)
• Regulator Station Replacement Costs Data (xlsx)
• Maintenance Costs (xlsx)
• Cover Description (pdf) (availability pdf) (update pdf)

San Diego Gas & Electric

• Distribution Replacement Costs Data (xlsx)
• Regulator Station Replacement Costs Data (xlsx)
• Maintenance Costs (xlsx)
• Cover Description (pdf) (availability pdf)  

Southwest Gas

• Distribution Replacement Costs Data, redacted (pdf)
• Maintenance Costs (xlsx)
• Confidentiality Motion (pdf)
• Cover Description (pdf) 

CPUC cost data direction to utilities:

• September 23, 2025 Templates (corrected October 14, 2025)
  • Distribution Replacement Costs Data - Template (xlsx)
  • Regulator Station Replacement Costs Data - Template (xlsx)
  • Maintenance Costs - Template (xlsx)
  • See Cost Data Ruling
• Correction: "Average cost of service-only replacement activities, per mile of main" should read "Average cost of service-only replacement activities, per mile of service."