Phoenix Arizona 2026 Gas Rates: The Number Homes Need
- 01. Snapshot: What Phoenix customers pay now
- 02. Detailed data table
- 03. How bills are built
- 04. Recent regulatory actions and filings
- 05. Historical context and recent trends
- 06. [How to estimate your bill]
- 07. Practical tips for Phoenix homeowners
- 08. Quick quote and timeline
- 09. Where to find authoritative updates
- 10. Additional numbers and context (data points)
Current residential natural gas rates in Phoenix (May 2026): most Phoenix-area residential customers served by Southwest Gas are paying a commodity (MGC/MGC or "per-therm") rate near $0.369 per therm for the Monthly Gas Cost (effective Jan 1, 2026) and a total typical winter bill around $70-75 per month for average-use customers; utilities that filed general rate cases (UniSource, Southwest Gas filings) are seeking modest delivery/base increases that could add roughly $5-$6 per month to average residential bills if approved in 2026-2027.
Snapshot: What Phoenix customers pay now
The headline commodity charge for many Phoenix households-Southwest Gas' Monthly Gas Cost (MGC) rate-fell to $0.36934 per therm effective January 1, 2026, after the company reported lower purchased gas costs to the Arizona Corporation Commission.
- Commodity (per therm): ~$0.369 (MGC effective Jan 1, 2026 for Southwest Gas customers).
- Typical winter bill: ~$70-75 per month for average residential customers using gas for space heating in cold months.
- Pending base rate requests: utilities have filed to recover investments, which would raise the basic monthly charge by roughly $3-$5 and add $5-$6 per month on average if approved.
Detailed data table
| Provider / metric | Published rate (2026) | Typical monthly impact | Effective date / note |
|---|---|---|---|
| Southwest Gas - MGC | $0.36934 per therm | Commodity savings vs prior month ≈ $1-2 | Effective Jan 1, 2026; monthly adjustment based on 12-month rolling average. |
| UniSource - base charge | Monthly basic charge increased to ~$11.94 (new tariff items) | Avg. increase $4-6 per month depending on usage | New rates taking effect March 1, 2026 (company filings and ACC review). |
| Statewide average (AZ) | ~$23.77 per thousand cf (October 2025 EIA/YCharts series reported monthly AZ residential price proxy) | Year-over-year change: small decline vs 2024-2025 | Monthly EIA-based series cited (YCharts aggregation through Oct 2025). |
How bills are built
Residential natural gas bills in Phoenix combine a monthly basic service charge, a delivery/delivery-related charge, and a volumetric commodity charge (per-therm or per-hundred cubic feet) that utilities adjust monthly to reflect purchased gas costs.
- Basic service charge - fixed monthly fee to maintain service meters and infrastructure; recent filings propose increases to this line item (UniSource examples show an increase from $10 to ~$11.94 or higher for some classes).
- Delivery / distribution - covers pipeline maintenance, customer service, and system upgrades; typically recovered through the base rates and is where utilities often seek multi-year recovery.
- Commodity / per-therm - passes through the cost of purchased gas; Southwest Gas' MGC moved down to $0.36934/therm on Jan 1, 2026 reflecting lower commodity costs.
Recent regulatory actions and filings
The Arizona Corporation Commission (ACC) approved adjustments and continues to review general rate cases and monthly gas cost updates, which means homeowners should expect periodic monthly MGC changes and occasional base rate proceedings with multi-month public review.
"Southwest Gas provided notice to the Commission that it is decreasing its Monthly Gas Cost rate due to lower commodity costs," the ACC noted in December 2025 when announcing the effective Jan 1, 2026 reduction.
Historical context and recent trends
Arizona residential gas prices rose and fell through 2022-2024 with winter peaks, then eased in 2025 as commodity markets softened; a YCharts/EIA series shows the Arizona residential proxy at about $23.77 per thousand cf in Oct 2025, slightly lower than some prior months.
Utilities are balancing lower commodity costs with higher capital and operating expenses, which has prompted filings to raise base delivery charges-UniSource's 2026/2027 proposals are an example of this dynamic and reflect a broader trend across regulated utilities in Arizona.
[How to estimate your bill]
To estimate your monthly residential gas bill, multiply your monthly therm usage by the commodity rate, then add the monthly basic charge and delivery fees; for Phoenix winter usage (typical 24-45 therms/month) that calculation yields the $70-$80 winter bill range for many customers.
- Step 1: record your monthly therm usage from a recent bill or online account. Monthly therms are usually printed on every statement.
- Step 2: multiply therms x per-therm commodity (e.g., 24 therms x $0.369 = $8.86). Commodity subtotal forms a small share when basic charge and delivery are added.
- Step 3: add basic service and delivery charges (varies by provider-see table). Final bill is the sum of these parts.
Practical tips for Phoenix homeowners
Small behavior and appliance steps can reduce gas usage and the impact of any base charge change: set thermostats modestly lower in winter, maintain furnaces annually, and insulate hot-water pipes to lower therm consumption. Home energy improvements get amplified when commodity prices rise.
- Enroll in budget billing if offered to smooth seasonal spikes. Budget billing can stabilize monthly outlays despite winter peaks.
- Check ACC case dockets for your utility to see pending rate requests and public hearing schedules. Regulatory dockets list expected customer impacts and dates.
- Consider income-qualified assistance and weatherization programs to reduce usage and bills long term. Assistance programs are noted in utility customer guides.
Quick quote and timeline
In December 2025 the ACC summarized the change: "Southwest Gas customers in Arizona ... can expect to see a reduction in next month's natural gas bill" when the MGC moved to $0.36934/therm effective Jan 1, 2026.
Where to find authoritative updates
For the most current, account-specific numbers consult your utility's customer portal, the Arizona Corporation Commission docket pages, or the EIA state price series for Arizona; these sources publish tariff changes, MGC notices, and historical series that track month-to-month movement. Official sources are updated faster than third-party aggregators.
Additional numbers and context (data points)
Representative figures reported in filings and public data: a reported Arizona residential proxy of $23.77 per thousand cf (Oct 2025 EIA/YCharts observation), Southwest Gas' MGC of $0.36934/therm (effective Jan 1, 2026), and company-provided customer impact estimates of roughly $4-6 per month from pending base rate cases in 2026-2027.
Everything you need to know about Phoenix Arizona 2026 Gas Rates The Number Homes Need
[Why did rates change in early 2026]?
Lower wholesale natural gas procurement costs pushed Southwest Gas' MGC downward, effective January 1, 2026, while separate rate case filings request higher fixed delivery charges to recover infrastructure investments.
[Will my bill rise again in 2026-2027]?
Possibly - several utilities filed general rate cases in late 2025 and early 2026 seeking increased revenue; if regulators approve those filings the average residential bill impact is estimated in company materials at roughly $4-$6 extra per month for typical users, with seasonal variations.
[How to check my exact rate and charges]?
Find your service provider on your gas bill (Southwest Gas, UniSource, etc.), then check the provider's tariff page or recent ACC filings; utilities publish monthly MGC/MSG notices and ACC posts decisions and public notices online.
[Are there low-income or discount programs available]?
Yes - utilities operating in Arizona offer low-income assistance, payment plans, and programs such as LIRA or bill credits; for example, UniSource and Southwest Gas describe discounts and targeted help in their public materials and filings.