Navajo Tribal Utility Authority (NTUA) Rate Selection Guide
The Navajo Tribal Utility Authority (NTUA) is a not-for-profit tribal enterprise of the Navajo Nation serving roughly 43,300 electric customers (plus water, wastewater, natural gas and off-grid solar) across 27,000 square miles of Arizona, New Mexico and Utah. While NTUA has deployed about 40,000 AMI smart meters, programmatic data access remains limited — no Green Button, API, or EDI programs exist today.
Navajo Tribal Utility Authority (NTUA) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| General Service | Commercial/industrial (all sizes) | Energy 8.40-11.00¢/kWh tiered; demand $4-6/kW above first 25 kW free; $11.45/mo | Most C&I facilities, especially those under 25 kW demand |
| Large Power Service (Primary) | Large industrial (≥1,000 kW) | $16.50/kW demand + 4.25¢/kWh, 12-month demand ratchet | High-load-factor primary-voltage loads under long-term contract |
| Oil and Gas Field Service | Industrial (oil & gas) | $12.00/kW demand + 5.20¢/kWh + $22.85/mo | Well-field and pipeline installations at primary voltage |
| Irrigation Service | Agricultural | $6.00/kW demand + 6.50¢/kWh + $11.45/mo | Seasonal crop irrigation pumping |
Market Overview
NTUA is an enterprise of the Navajo Nation, established in 1959, governed by its own Management Board rather than state utility commissions. There is no retail electric choice; customers take bundled service under NTUA's published rate schedules. All electric rates carry an Adjustment for Purchased Power Cost Changes against a Management Board-set baseline ($0.0800/kWh effective January 1, 2025), passing wholesale power cost variances through to customers.
Need to pull your actual usage data to compare rates? See the Navajo Tribal Utility Authority (NTUA) Data Access Guide →
Current Rate Schedules
NTUA's commercial and industrial electric rates are published on ntua.com. General Service covers most C&I loads with tiered energy and demand charges (first 25 kW free); Oil and Gas Field Service and Large Power Service (Primary, ≥1,000 kW with 36-month contract) serve heavy industrial loads with flat demand/energy pricing. All schedules carry a purchased power cost adjustment against the 2025 baseline of $0.0800/kWh, and demand is billed on maximum 15-minute integrated demand with power factor penalties below 85-90%.
Effective: January 1, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| General Service | commercial | Commercial, industrial, institutional, three-phase farm and other non-residential uses; demand meter required at ≥25 kW | $11.45/month service charge; demand: first 25 kW free, next 175 kW $6.00/kW, additional $4.00/kW; energy: first 200 kWh $0.1100, next 800 kWh $0.0920, next 6,000 kWh $0.0900, additional $0.0840/kWh; $16.20 monthly minimum; PF penalty below 85% | — |
| Large Power Service (Primary) | industrial | Primary-voltage (2,400V+) customers with minimum 1,000 kW billing demand and a written contract of at least 36 months | Demand $16.50/kW (all kW of billing demand, 12-month ratchet, min 1,000 kW); energy $0.0425/kWh all kWh; minimum charge = demand charge on billing demand; PF adjustment below 90% | — |
| Oil and Gas Field Service | industrial | Oil and gas industry installations at primary voltage, single meter, 12-month minimum contract | $22.85/month service charge; demand $12.00/kW all kW; energy $0.0520/kWh all kWh; $90.00 monthly minimum; PF penalty below 85% | — |
| Irrigation Service | agricultural | Irrigation pumping service for crops; demand meter required | $11.45/month service charge; demand $6.00/kW all kW; energy $0.0650/kWh all kWh; $17.55 monthly minimum; PF penalty below 90% | — |
Rate Recommendations by Use Case
Small commercial (trading post, office, chapter house)
Stay on General Service and keep demand under 25 kW to avoid demand charges entirely.
The first 25 kW of demand is free, so small facilities pay only tiered energy (mostly 8.40-9.00¢/kWh at volume) plus $11.45/month.
- Stagger HVAC and equipment startups to stay under 25 kW
- Track monthly usage in the myntua Usage Widget
- Install your own submetering if demand-critical
Mid-size industrial / institutional (50-500 kW)
Optimize within General Service tiers and correct power factor.
Demand above 200 kW drops to $4.00/kW and marginal energy is 8.40¢/kWh, but PF below 85% triggers kVA billing — correction is usually the fastest payback.
- Install capacitor banks on large motor loads
- Sequence 15-minute demand peaks
- Request a usage extract from NTUA before efficiency projects
Large industrial at primary voltage (≥1 MW)
Negotiate the Large Power Service contract demand carefully and protect against the 12-month ratchet.
At $16.50/kW with a ratchet and 1,000 kW floor, demand dominates the bill; the 4.25¢/kWh energy rate rewards high load factors.
- Right-size contract demand before signing the 36-month agreement
- Use soft starts and load sequencing to avoid ratchet-setting spikes
- Maintain power factor above 90%
Oil & gas field operations
Use the dedicated Oil and Gas Field Service schedule for well-field and pipeline loads.
Flat $12.00/kW + 5.20¢/kWh at primary voltage beats General Service for high-demand continuous field loads, with a 12-month contract minimum.
- Compare against General Service tiers for intermittent loads
- Correct power factor on pump motors to avoid 85% kVA billing
- Confirm primary-voltage service availability with the district office
Historical Rate Trends
NTUA's base rate schedules have been remarkably stable — the core General Service and Large Power structures date to a Management Board approval effective September 1, 2007 (per the WAPA-filed tariff). Year-to-year bill changes flow primarily through the annual Purchased Power Cost Adjustment baseline, set at $0.0800/kWh effective January 1, 2025.
September 1, 2007
Current base rate structures for General Service ($11.45 service charge, tiered demand/energy) and Large Power Service ($16.50/kW, $0.0425/kWh) approved by the Management Board (per WAPA-filed tariff)
Base rate resetJanuary 1, 2025
Annual Purchased Power Cost Adjustment baseline set at $0.0800/kWh for 2025, applied across all electric rate schedules
PPCA baseline updateOverall trend: Stable base rates with bill variability driven by the annual purchased power cost adjustment rather than base rate cases.
Next expected change: The Management Board resets the purchased power cost baseline annually each January; monitor ntua.com/utility-rates.html for the 2026 adjustment.
Cost Optimization Strategies
With no interval data access and demand-heavy industrial rates, NTUA C&I savings come from rate schedule selection, power factor correction, and demand management informed by the maximum 15-minute demand billing rules — plus careful contract structuring on Large Power's 12-month ratchet.
Exploit the free first 25 kW on General Service
For: General Service C&I customers
Facilities near or below 25 kW pay no demand charge at all; keeping peak demand under thresholds (25 kW, then 200 kW where the rate drops to $4.00/kW) directly cuts the bill.
Power factor correction
For: Motor-heavy industrial, irrigation, and oil & gas loads
NTUA bills 85% of kVA/kVAh when power factor falls below 85% on General and Oil & Gas Field service (90% on Large Power and Irrigation). Capacitor banks on motor-heavy loads eliminate this penalty.
Manage the Large Power 12-month demand ratchet
For: Large Power Service (Primary) customers
Billing demand is the higher of contract demand or the max 15-minute demand from the past 12 months (min 1,000 kW). A single spike locks in $16.50/kW for a year, so soft-start sequencing and contract demand right-sizing are critical.
Track the purchased power cost adjustment
For: All C&I customers
All schedules pass through wholesale power cost variances against the annual baseline ($0.0800/kWh in 2025). Budget and hedge facility energy costs around the January baseline reset.
Request manual usage extracts for audits
For: C&I customers undertaking audits or DER projects
Since no interval exports exist, request daily/hourly usage extracts from NTUA (1-800-528-5011) before energy audits or solar sizing studies; submarine metering may be warranted for demand-critical sites.
To implement these strategies, you need your 15-minute interval data. Learn how to download Navajo Tribal Utility Authority (NTUA) interval data →
Frequently Asked Questions
Can my energy consultant pull our NTUA usage data through an API or Green Button?▾
Not through the utility itself — NTUA offers no API or Green Button Connect My Data. Nectar provides API access to NTUA billing data; see docs.nectarclimate.com. The direct utility path is manual: the customer signs a written authorization letter, the consultant submits it with a letterhead request to the customer's NTUA district office (or via 1-800-528-5011), and NTUA may — at its discretion — release PDF statements or a CSV extract, typically within 10-15 business days.
Does NTUA support EDI billing (810/820/867) for multi-site commercial customers?▾
No. NTUA does not support EDI for any service (electric, gas, water or wastewater) and is not on the DOE's list of utilities offering EDI. Multi-site customers must manage accounts through the myntua.com portal or arrange manual statement delivery; ACH/e-check payment is available through the portal.
Which NTUA rate schedule applies to my commercial facility?▾
Most C&I loads fall under General Service, which requires a demand meter at 25 kW or more and bills tiered demand (first 25 kW free) and declining-block energy. Primary-voltage loads of at least 1,000 kW with a 36-month contract qualify for Large Power Service ($16.50/kW + 4.25¢/kWh), and oil and gas installations have a dedicated schedule ($12.00/kW + 5.20¢/kWh).
Can I get 15-minute interval data even though NTUA has smart meters?▾
Not through any self-service channel. NTUA's ~40,000 AMI meters feed an internal meter data management system, and commercial demand is billed on maximum 15-minute integrated demand, but the customer portal exposes only monthly usage summaries. You can call 1-800-528-5011 to request a daily or hourly extract; availability, format (likely CSV or PDF) and turnaround are not guaranteed.
What is the Purchased Power Cost Adjustment on NTUA bills?▾
Every NTUA electric rate schedule includes an adjustment that passes through differences between actual purchased power costs and a baseline set annually by the Management Board — $0.0800/kWh effective January 1, 2025. When NTUA's wholesale power and transmission costs exceed the baseline, bills rise; when they fall below it, bills are credited.
How does the power factor penalty work on NTUA commercial rates?▾
On General Service and Oil and Gas Field Service, if your power factor drops below 85%, NTUA bills 85% of the kVA and kVAh used instead of the metered kW/kWh. Large Power and Irrigation schedules use a 90% threshold. Capacitor banks on motor-heavy loads typically eliminate the penalty with fast payback.
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