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 System Integrity Mechanism
On July 9, 2025 the Arizona Corporation Commission approved the Company’s request for a capital tracker, the System Integrity Mechanism (SIM). The SIM will enhance natural gas pipeline safety in Arizona by enabling Southwest Gas to more timely recover its investments in safety-related pipe replacement.
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
Low Income Ratepayer Assistance (LIRA)
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)
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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.
