UNS Electric, Inc. Rate Selection Guide
UNS Electric, Inc. (UniSource Energy Services) is an investor-owned utility serving roughly 107,000 electric customers in Mohave and Santa Cruz counties, Arizona. A subsidiary of UNS Energy / Fortis and sister to Tucson Electric Power, it offers AMI-based hourly usage via the My Account portal and a signed Usage Data Release Form for third-party access, regulated by the Arizona Corporation Commission.
UNS Electric, Inc. Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| Medium General Service (EGMGS) | Commercial | $100/mo + $14.67/kW + $0.074955/kWh + PPFAC | Mid-size commercial loads (20-750 kW) |
| Large General Service (EGLGS) | Commercial | $300/mo + $14.58/kW + $0.074848/kWh + PPFAC (3% primary credit) | Larger commercial loads below 69 kV |
| Large Power Service (EILPS) | Industrial | $1,500/mo + $17.74/kW + $0.058744/kWh + PPFAC | Transmission-voltage industrial sites (>= 500 kW) |
Market Overview
UNS Electric is an investor-owned utility regulated by the Arizona Corporation Commission. C&I customers buy bundled service and cannot shop for a competitive supplier. Rates are set through ACC rate cases; current rates stem from Decision No. 79277, effective February 1, 2024.
Need to pull your actual usage data to compare rates? See the UNS Electric, Inc. Data Access Guide →
Current Rate Schedules
UNS Electric C&I customers are served under demand-metered General Service and Power Service tariffs approved by the Arizona Corporation Commission (Decision No. 79277), effective February 1, 2024. The figures below are verified from the filed tariff sheets and reflect bundled Standard Offer Service; a per-kWh PPFAC (Rider-1) varies and is added to the energy charge. A 3% demand-charge credit applies to Large General Service customers taking primary-voltage service.
Effective: February 1, 2024 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Medium General Service (EGMGS) | commercial | General power and lighting; mid-size loads (customers at/above 750 kW may move to Large General Service). Minimum billing demand 20 kW. | Basic Service Charge $100.00/month; Demand Charge $14.67 per kW; Energy Charge $0.074955 per kWh bundled (Delivery $0.005022 + Base Power Supply $0.069933) plus PPFAC. Agricultural variant demand $15.65/kW. | — |
| Large General Service (EGLGS) | commercial | General power and lighting below 69 kV; larger loads. Primary metering required above 2,500 kW. Minimum billing demand 450 kW. | Basic Service Charge $300.00/month; Demand Charge $14.58 per kW (3% credit at primary voltage); Energy Charge $0.074848 per kWh bundled (Delivery $0.004915 + Base Power Supply $0.069933) plus PPFAC. | — |
| Large Power Service (EILPS) | industrial | Three-phase service at transmission voltages of 69 kV or greater; large industrial loads. Minimum billing demand 500 kW; 2-year minimum contract with 12-month termination notice. | Basic Service Charge $1,500.00/month; Demand Charge $17.74 per kW; Energy Charge $0.058744 per kWh bundled (Delivery $0.000503 + Base Power Supply $0.058241) plus PPFAC. Power-factor adjustment below 95%. | — |
| Large General Service Time-of-Use (EGLGST) | commercial | Large general service customers electing time-of-use energy pricing. | Demand and TOU energy structure with on-/off-peak periods; see filed tariff for current per-kW and per-kWh figures plus PPFAC. | — |
| Stand-Alone EV Charging (EGDCFCX) | ev | Commercial stand-alone DC fast-charging EV stations. | Dedicated EV charging tariff; see filed tariff for demand/energy components plus PPFAC. | — |
Rate Recommendations by Use Case
Mid-size commercial facility
An office park, retail center, or light-commercial building with demand in the tens to low hundreds of kW.
EGMGS pairs a moderate $100/mo basic charge with a $14.67/kW demand charge; managing peak kW is the primary lever since energy is $0.074955/kWh plus PPFAC.
- Shave coincident peaks to lower billed demand
- Watch the 20 kW minimum and ratchet provisions
- Use My Energy Usage to find demand drivers
Large commercial load below 69 kV
A large store, campus, or facility with several hundred kW of demand served at distribution/primary voltage.
EGLGS has a $300/mo basic charge and $14.58/kW demand; taking primary-voltage service earns a 3% demand-charge credit, and primary metering is required above 2,500 kW.
- Pursue primary-voltage service for the 3% demand credit
- Mind the 450 kW minimum billing demand
- Consider the EGLGST TOU variant if load is shiftable
Transmission-voltage industrial site
A manufacturer or large industrial customer able to take service at 69 kV or above with high, steady demand.
EILPS offers the lowest energy charge ($0.058744/kWh) but the highest demand charge ($17.74/kW) and a $1,500/mo basic charge, rewarding high load factor; a power-factor penalty applies below 95%.
- Maximize load factor to dilute the demand charge
- Keep power factor >= 95% to avoid penalties
- Plan for the 2-year contract and 12-month termination notice
Historical Rate Trends
UNS Electric's current rates were approved in ACC Decision No. 79277 and took effect February 1, 2024, raising bills to support reliability investments.
February 1, 2024
New electric rates effective under ACC Decision No. 79277; large general service plans rose roughly 7% and an approximately 12% overall bill increase was reported for customers.
~7-12%Overall trend: Rates have risen with the 2024 rate case; the company describes long-run increases below inflation. PPFAC adjusts energy costs periodically.
Next expected change: Future changes occur through ACC rate cases and periodic PPFAC adjustments; a 2026 gas rate proposal is separate from electric.
Cost Optimization Strategies
Because UNS Electric C&I bills are demand-driven, the largest savings come from reducing billed peak kW and improving load factor. High-voltage customers can also benefit from the lower Large Power Service energy charge, and primary-voltage Large General Service customers earn a 3% demand credit.
Peak demand reduction
For: All demand-metered C&I (EGMGS/EGLGS/EILPS)
Stagger equipment startups and shave peaks to lower the billed 15-minute demand; note the 75%-of-prior-11-month and minimum-kW ratchets that keep demand charges sticky.
Service-voltage optimization
For: Large EGLGS / EILPS
Larger loads taking service at transmission voltage qualify for Large Power Service's lower energy charge ($0.058744/kWh); Large General Service primary-voltage customers receive a 3% demand-charge credit.
Power-factor correction
For: Large Power Service (EILPS)
Maintain power factor at or above 95% to avoid the Large Power Service power-factor adjustment penalty.
Interval data analytics
For: All C&I
Use My Energy Usage hourly data (or aggregator interval feeds) to pinpoint demand drivers, baseload waste, and TOU opportunities.
To implement these strategies, you need your 15-minute interval data. Learn how to download UNS Electric, Inc. interval data →
Frequently Asked Questions
How does a C&I customer share UNS Electric usage data with a consultant?▾
Submit a signed Electric Usage Data Release Form. UNS Electric verifies the authorization and delivers billing and usage data (typically 12-24 months) to the third party by email or secure transfer within 5-10 business days. For automated, ongoing access, use Nectar — see docs.nectarclimate.com.
Does UNS Electric support Green Button or a public API?▾
No. UNS Electric has not implemented Green Button (DMD/CMD) or a public developer API. Programmatic access is achieved through Nectar, which authenticates with the customer's authorization and exposes billing and interval data via API — see docs.nectarclimate.com.
What interval granularity is available?▾
Hourly interval data is confirmed through My Energy Usage, with data back to 2017 and updates at least every 24 hours. Finer 15- or 30-minute granularity is not publicly documented; request confirmation from UNS Electric if your analysis requires it.
Which rate applies to a large commercial or industrial site?▾
Large General Service (EGLGS) applies to larger general loads below 69 kV, while Large Power Service (EILPS) applies to transmission-voltage customers at 69 kV or above. Medium General Service (EGMGS) covers mid-size loads. All are demand-metered with verified per-kW charges effective February 1, 2024.
Can our business choose a competitive electricity supplier?▾
No. Arizona does not offer retail electric choice to UNS Electric's customers. Rates are bundled and set by the Arizona Corporation Commission through formal rate cases.
Automate UNS Electric, Inc. Rate Analysis with Nectar
Nectar continuously monitors your UNS Electric, Inc. rate options and alerts you when a better schedule is available. Save 10-30% on energy costs.
Nectar for Energy & Sustainability Teams
Managing utility costs for commercial or industrial buildings? Nectar offers a free rate analysis — we'll review your current rate schedules and identify where switching tariffs or shifting load can save 10-30%.
Get a Free Rate AnalysisNectar for Energy Brokers & Consultants
Advising clients on rate optimization? Nectar works with energy consultants who need reliable interval data and automated rate comparison tools.
Partner with Us