Decoupling and Delivery Charge Adjustment Provision (DCA)
The DCA specifies the accounting procedures and rate setting adjustments necessary to assure the Utility neither over-recovers, nor under-recovers, the margin-per-customer amounts authorized in its most recent general rate case proceeding.
Graham County Utilities Acquisition
On December 3, 2021, Southwest Gas proposed to include customers of GCU in its cost of service and effective sales rates as part of its next general rate case filing. This was approved on January 10, 2023, and effective February 1, 2023.
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ARIZONA ENERGY EFFICIENCY AND RENEWABLE ENERGY RESOURCE TECHNOLOGY PORTFOLIO IMPLEMENTATION PLAN (DOCKET NO. G-01551A-23-0157)
On June 1, 2023, Southwest Gas filed an application with the Arizona Corporation Commission requesting approval of an Energy Efficiency and Renewable Energy Resource Technology Portfolio Implementation Plan for Program Years 2024-2025, which was designed in accordance with the Gas Utility Energy Efficiency Standards set forth in Sections R14-2-2501 through R14-2-2520 of the Arizona Administrative Code.
2021 Arizona Base Rate Adjustment
On December 3, 2021, Southwest Gas Corporation (“SWG”) filed an application with the Arizona Corporation Commission (“ACC”) for a permanent gross revenue increase. This was approved on January 10, 2023, and effective February 1, 2023. To learn more, check out
Invested in Arizona
Request Other Rates and Tariff Information
Use the link below to request Rates and Tariff information not available on this website. Should you have any questions regarding your bill, please contact Customer Assistance at 877-860-6020.
Download the Entire Arizona Gas Tariff
Driscopipe® 8000 Frequently Asked Questions (FAQs)
Low Income Ratepayer Assistance (LIRA)
Customer-Owned Yard Line (COYL) Program
You may be eligible to participate in our COYL leak inspection and replacement program. The COYL program is another way we can help keep your family, property and neighborhood safe. Call 800-654-2765 to see if your property qualities for a free line leak inspection.
Regulatory Expense Surcharge
Effective March 1, 2023, a Regulatory Expense Surcharge will collect the rate case expense up to $400,000 incurred in the 2021 Arizona General Rate Case. The balance will be recovered over a 48-month period. It will apply to Arizona customers only. The surcharge is $0.01 per customer and will appear as a line item on the bill.
Arizona Gas Tariff No. 7
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Other Regulatory Information
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Learn How Gas Rates Are Set
The rates used by Southwest Gas are set by state regulatory commissions using a process called the "rate case cycle." Because of individual state regulations, the rate case cycle differs slightly for each state. See how rates are set for your state.
Request Rates & Tariff Information
Use this form to request historical Rates and Tariff information not available on this website. This form may also be used as a request to be placed on Southwest Gas' California Advice Letter Service List. If you have any questions regarding your bill, please contact Customer Assistance at
Commission Websites
Check your state’s Commission office for more information on utility regulation and consumer programs and services.
