Customer Data Modernization Initiative (CDMI)
The CDMI is intended to replace the Company's aging and outdated customer data systems. Approval of the application would allow the Company to track and defer the costs associated with the CDMI, so that the Company can present the Arizona jurisdictional portion of the costs to the Commission for review and consideration in a future rate case.
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.
2019 Arizona Base Rate Adjustment Request
In 2019, Southwest Gas filed a proposed $90 million rate adjustment with the Arizona Corporation Commission. In December, Southwest Gas received approval to increase rates by $36.7 million. 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
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
877-860-6020.
Commission Websites
Check your state's Commission Office for more information about rates and regulations.
