UNS Gas, Inc. Rate Selection Guide
UNS Gas, Inc. is a regulated natural gas distribution utility serving roughly 114,000 customers across Arizona under the UniSource Energy Services brand. A subsidiary of UNS Energy / Fortis Inc. (and sister company to Tucson Electric Power), it provides hourly AMI usage data through its My Account portal and authorizes third-party access via a Usage Data Release Form, under Arizona Corporation Commission regulation.
UNS Gas, Inc. Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| GGSVS (Small Volume Commercial) | commercial | $28.32/mo basic + ~$0.7914/therm effective | Small businesses and light commercial gas use |
| GILVS (Large Volume Industrial/Commercial) | industrial | $285.73/mo basic + ~$0.6385/therm effective | High-volume commercial/industrial gas users |
| T-1 / T-2 Transportation | industrial | Distribution-only transport (per tariff) | Customers procuring their own gas commodity |
| Negotiated Sales Program (NSP) | industrial | Negotiated; no PGA | Eligible large customers with negotiated supply |
Market Overview
UNS Gas is a regulated gas distribution utility under Arizona Corporation Commission jurisdiction (entity license G-04204A) with no competitive retail supplier choice. Base rates are set in ACC rate cases (new rates effective March 1, 2026, Decision No. 81653), with gas commodity costs passed through at cost via the Purchased Gas Adjustor (PGA) and annual true-ups through the new ARAM, LFCR and DSM riders.
Need to pull your actual usage data to compare rates? See the UNS Gas, Inc. Data Access Guide →
Current Rate Schedules
UNS Gas's current gas rates took effect March 1, 2026 under ACC Decision No. 81653, following a rate case that also approved the first Arizona Annual Rate Adjustment Mechanism (ARAM). Business customers are served on GGSVS (Small Volume Commercial) and GILVS (Large Volume Industrial/Commercial, including GTLVS/GTNILVS transport variants), with T-1/T-2 transportation and a Negotiated Sales Program available. Bills combine a fixed basic service charge, a per-therm base delivery rate, and the pass-through Purchased Gas Adjustor (PGA), plus LFCR and DSM riders.
Effective: March 1, 2026 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| GGSVS – Small Volume Commercial Service | commercial | Small-volume commercial gas customers. | Basic Service Charge $28.32/month (effective $28.37 with LFCR); base delivery $0.3134/therm plus $0.4765/therm gas cost ≈ $0.7914/therm effective tariff rate (excl. taxes). Effective March 1, 2026. | — |
| GILVS – Large Volume Industrial/Commercial Service | industrial | Large-volume commercial and industrial gas customers (includes GTLVS/GTNILVS transport variants). | Basic Service Charge $285.73/month; base delivery $0.1620/therm plus $0.4765/therm gas cost ≈ $0.6385/therm effective tariff rate (excl. taxes). Large-volume customers are not charged the LFCR. Effective March 1, 2026. | — |
| T-1 – Transportation Service 1 | industrial | Customers who procure their own gas supply and contract for distribution-only transportation (smaller transport class). | Transportation (delivery-only) rate; customer arranges its own gas commodity. See tariff for current per-therm transportation charges. Effective March 1, 2026. | — |
| T-2 – Transportation Service 2 | industrial | Larger transportation customers procuring their own gas supply for distribution-only delivery. | Transportation (delivery-only) rate for larger volumes; customer arranges its own gas commodity. See tariff for current per-therm transportation charges. Effective March 1, 2026. | — |
| NSP – Negotiated Sales Program | industrial | Eligible large customers under negotiated sales arrangements; NSP customers are not charged the PGA. | Negotiated per-therm pricing; commodity handled outside the standard PGA. See tariff for terms. Effective March 1, 2026. | — |
Rate Recommendations by Use Case
Small business / light commercial gas user (GGSVS)
Small commercial accounts on GGSVS pay a $28.32 monthly basic charge plus roughly $0.79/therm all-in (base delivery $0.3134 + gas cost $0.4765).
For modest volumes, GGSVS's lower fixed charge beats GILVS even though its per-therm delivery is higher.
- Enroll in My Account and track the billed therm usage graph
- Use My Energy Usage to spot weather-driven spikes
- Tap Business Energy Solutions rebates for efficient equipment
High-volume commercial / industrial site (GILVS)
Large-volume users on GILVS pay a $285.73 basic charge but only ~$0.64/therm all-in (base delivery $0.1620 + gas cost $0.4765), and avoid the LFCR rider.
The ~$0.151/therm lower base delivery offsets the higher fixed charge above roughly 1,900 therms/month, making GILVS the cheaper schedule for high-volume sites.
- Model GGSVS vs GILVS at your actual monthly volume
- Confirm eligibility and the GTLVS/GTNILVS transport variants
- Layer in efficiency rebates to further cut therms
Large user procuring its own gas (T-1/T-2 or NSP)
Customers who can buy their own gas can take T-1/T-2 transportation (distribution-only) or the Negotiated Sales Program, paying UNS Gas for delivery while sourcing the commodity separately.
Separating commodity from delivery can beat the bundled PGA and provide price certainty for large, steady loads.
- Compare delivered transport cost vs bundled GILVS+PGA
- Engage a gas marketer/broker for commodity supply
- Confirm NSP eligibility removes PGA exposure
Energy consultant / ESCO needing data access
Third parties obtain UNS Gas data after the customer files a Gas Usage Data Release Form (5–10 business days); automated feeds require arranged EDI 867/810.
There is no public API or Green Button, so plan around the manual form-based process or set up EDI for recurring multi-site data.
- Pre-fill the Usage Data Release Form for clients to sign
- Request Consumption History (first free per year) for quick baselines
- For portfolios, inquire about EDI trading-partner setup with UniSource
Historical Rate Trends
The Arizona Corporation Commission approved new UNS Gas base rates effective March 1, 2026 (Decision No. 81653), raising the basic service and delivery charges to support safe, reliable service. The same rate case made UNS Gas the first Arizona utility to adopt an Annual Rate Adjustment Mechanism (ARAM), allowing formula-based annual adjustments. Gas commodity costs continue to flow through at cost via the Purchased Gas Adjustor (PGA).
March 1, 2026
New ACC-approved base rates effective March 1, 2026 (Decision No. 81653), including higher basic service and per-therm delivery charges and adoption of the Annual Rate Adjustment Mechanism (ARAM).
varies by classOverall trend: Upward — new base delivery and fixed charges effective March 2026, with annual ARAM adjustments going forward.
Next expected change: Annual ARAM adjustment under the ACC-approved formula; PGA changes periodically with gas-market costs.
Cost Optimization Strategies
UNS Gas cost optimization centers on matching the right rate schedule to volume and, where feasible, procuring gas directly. Large users should evaluate the GILVS step-down and transportation/NSP options, and use hourly usage data plus efficiency rebates to cut therms.
Qualify for GILVS large-volume service
For: Commercial/industrial sites with high monthly therm volumes
GILVS cuts the base delivery rate from ~$0.3134 to ~$0.1620/therm and exempts the LFCR, at the cost of a $285.73 basic charge. High-volume sites recover that fixed charge quickly.
Transportation service (T-1/T-2)
For: Large customers able to contract for their own gas commodity
Customers who can procure their own gas supply take distribution-only transportation service, paying UNS Gas only for delivery and avoiding the bundled PGA commodity markup-free pass-through.
Negotiated Sales Program (NSP)
For: Eligible large/industrial customers
Eligible large customers under the NSP are not charged the PGA, with negotiated commodity terms — useful for price certainty or favorable supply arrangements.
Efficiency rebates + usage analytics
For: All commercial and industrial customers
Use Business Energy Solutions rebates and hourly My Energy Usage data to reduce therms, correlating usage with temperature to target weatherization and equipment upgrades.
To implement these strategies, you need your 15-minute interval data. Learn how to download UNS Gas, Inc. interval data →
Frequently Asked Questions
How can a C&I customer or consultant obtain UNS Gas hourly usage data?▾
Customers with AMI gas meters can view hourly therm usage in My Account under My Energy Usage, refreshed at least every 24 hours. There is no CSV export or Green Button, so for data files a consultant should have the customer file a Gas Usage Data Release Form (5–10 business days) or request a Consumption History extract. Business aggregators can also arrange EDI 867/810 feeds directly with UniSource.
Does UNS Gas support Green Button or a public API?▾
No. UNS Gas does not offer Green Button, Green Button Connect My Data, or a public RESTful API. Third-party data access is a manual, form-based process via the Usage Data Release Form, and automated delivery is only available through arranged EDI (ANSI X12) trading-partner connections.
What commercial and industrial gas rate schedules does UNS Gas offer?▾
UNS Gas's business schedules are GGSVS (Small Volume Commercial Service) and GILVS (Large Volume Industrial/Commercial Service, including the GTLVS/GTNILVS transport variants), plus T-1 and T-2 transportation rates and the Negotiated Sales Program (NSP). As of the March 1, 2026 Statement of Rates, GGSVS carries a $28.32 basic service charge with a $0.3134/therm base delivery rate (about $0.7914/therm all-in including gas cost), and GILVS large-volume service carries a $285.73 basic charge with a $0.1620/therm base delivery rate (about $0.6385/therm all-in).
Who regulates UNS Gas rates and is there supplier choice?▾
UNS Gas (entity license G-04204A) is regulated by the Arizona Corporation Commission; there is no competitive retail gas supplier choice. New base rates took effect March 1, 2026 under ACC Decision No. 81653, and UNS Gas became the first Arizona utility to implement an Annual Rate Adjustment Mechanism (ARAM). Gas commodity costs pass through at cost via the Purchased Gas Adjustor (PGA).
How can a business lower its UNS Gas bill?▾
Because gas bills combine a fixed basic service charge with a per-therm delivery and gas-cost component, large users benefit from qualifying for the large-volume GILVS schedule (much lower per-therm delivery: ~$0.162 vs ~$0.313 base) once volumes justify the higher $285.73 basic charge. Evaluate transportation service (T-1/T-2) or the Negotiated Sales Program if you can procure your own gas, and use hourly My Energy Usage data plus Business Energy Solutions rebates to cut consumption.
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