Arizona Rates & Regulation

2024 Arizona General Rate Case

On March 27, 2025, the Arizona Corporation Commission approved a permanent gross revenue increase for Southwest Gas Corporation. To learn more, check out Invested in Arizona

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. 

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.

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

Arizona Gas Tariff No. 7

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Low Income Ratepayer Assistance (LIRA)

LIRA provides a discounted monthly basic service charge and a 30% reduction on the “per therm” rate year-round. Program eligibility is 250 percent of federal poverty level.
 
 

Regulatory Expense Surcharge

Effective March 27, 2025, a Regulatory Expense Surcharge will collect the rate case expense up to $400,000 incurred in the 2024 Arizona General Rate Case (GRC) and the remaining balance from the 2021 GRC. The balance will be recovered over a 36-month period. It applies to all Arizona customers except G-30, G-65, SB-1, and special contract customers. The surcharge will be assessed on a volumetric basis and will appear as a line item on the bill.
 

Driscopipe® 8000 Frequently Asked Questions (FAQs)

Southwest Gas is committed to your safety and taking steps to protect customers and non-customers from incidents of premature degradation in Driscopipe® 8000 natural gas piping.
 
 

Arizona Bills & Gas Prices FAQ

Have questions about your gas bill and energy usage during the cooler months? We have answers for your specific state and we’re here to help.
 
 
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Learn How Gas Rates Are Set

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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

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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

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Check your state’s Commission office for more information on utility regulation and consumer programs and services.