Natural Gas Rates Explained

Learn about the factors that determine the price you pay for natural gas.

How is My Natural Gas Bill Calculated?

Our rates are regulated by the California Public Utilities Commission, or CPUC, based on three components:

  1. Commodity Costs – The cost of the natural gas itself
  2. Transportation Costs – The cost of natural gas delivery
  3. Public Purpose Surcharge – The cost to fund natural gas-related programs

Overall, about 92% of your bill goes toward products and services provided to you essentially at cost, with the remaining eight percent going toward a return on SoCalGas’ investment in the gas system.

More information about how these charges are reflected on your bill can be found here.

How are Rates Calculated?

The costs associated with delivering natural gas are ultimately approved by the CPUC, with input from SoCalGas and public advocates. This process is repeated every three to four years.

1. Propose

  • SoCalGas analyzes the future needs of the natural gas system and estimates the funding needed for the next three years to upgrade utility infrastructure, operate systems safely, invest in new technology and provide responsive customer service.
  • During the process, the CPUC also analyzes the rate increases required by Public Purpose Programs, such as those mandated to assure natural gas service remains accessible to customers with low incomes.

2. Review

  • The CPUC takes about two to three years to hold public hearings, open comment periods and formal sessions before an administrative law judge. They also need that time to analyze the input gathered.
  • Public advocates comment on both the plans for the natural gas system and their proposed costs and raise issues they believe to be in the public’s interests. 
  • After its analysis, the CPUC determines SoCalGas’ budget for the next three years.

3. Implement

  • As a final step, the CPUC decides how to divide the increased need for funding into different rate increases to be paid by the different categories of natural gas customers. 
  • Commercial and industrial users usually fund a larger part of the rate increases because of their heavier demands on the system.
  • Residential rates are split into “tiers,” and customers who use more natural gas pay a greater percentage of the funding needed to operate and maintain the natural gas system.

Upcoming Rate Changes

Periodically, SoCalGas customers can expect key rate changes. All requests for rate changes must be submitted by SoCalGas to, and approved by, the California Public Utilities Commission (CPUC) pursuant to a four-year General Rate Case (GRC) application process, as well as other proceedings. At a minimum, there is a rate change at the beginning of each year.
These rate changes allow for investment in, and improvement of, the SoCalGas natural gas infrastructure that delivers fuel to cook food, dry clothes, provides heating and hot water, and power electric generation plants in Southern California. It is important to note that these rate changes are not related to the Aliso Canyon natural gas leak, which was repaired in 2016.
Besides these rate changes, the price you pay for natural gas (known as the Gas Commodity rate), varies monthly depending on the market prices. The current rates can be found here.
  • Rate Change

    Gas residential transportation rates are increasing by $0.038 per therm and $0.129 per therm for residential and small commercial customers, respectively, mainly due to continue safely providing utility service to customers, to maintain adequate system reliability, to provide responsive customer services, to comply with governmental regulations and orders, an under collection in the balancing account due to mild weather and an increase in the 2021 Greenhouse Gas revenue requirement. 

    The small commercial customers’ Triennial Cost Allocation Proceeding (TCAP) May 2020 rates increase was deferred to January 2021 due to COVID.

    Effective Date



Effective October 1, 2021, the procurement component of the core sales rate will increase 13.155 ¢/therm to 57.580 ¢/therm. This increase resulted from an overall 13.255 ¢/therm increase in commodity price and a decrease of 0.100 ¢/therm in account adjustments.  Compared to a year ago, the procurement rate is about 127.9% higher (25.268 ¢/therm) than what it was effective October 2020.  

Combined with the transportation rate, core residential and C&I sales customers will see about a 8.8% rate increase from last month.