Utility-specific tariffs and energy service agreements
Large-load customers are expected to fund customer-caused infrastructure and provide financial security; docket E-00000A-25-0069 remains under development.
Current position
Arizona is reviewing statewide consistency while APS, TEP, and other providers use utility-specific extra-high-load tariffs and negotiated agreements.
- Actions
- 2
- Published tariffs
- 0
- Legislation
- 0
- Status
- Adopted + under review
Regulatory and utility record
Tariffs, contracts, and proceedings
Each record is shown on its own terms. A utility-specific tariff or contract does not automatically apply to every large customer in the state.
Arizona Public Service · In progress
Arizona large-load and data-center policy
The ACC is reviewing definitions, tariffs, agreements, cost responsibility, and interconnection policy for large loads.
Why it matters
Current protections are utility-specific; the statewide policy docket remains open.
The current official record establishes the proceeding but does not yet publish normalized customer terms.
Arizona Public Service · Effective
APS Extra High Load Factor tariff
APS's current Extra High Load Factor schedule sets eligibility, contract, minimum-billing, facilities, and optional load-control terms for qualifying high-load-factor customers.
Why it matters
The tariff is effective; APS has separately proposed revisions in its pending 2025 rate case, so the current and proposed terms must not be conflated.
Enforceable terms
Key requirements
Eligibility threshold
5 MW and 92% load factor
The customer must reach at least 5 MW and maintain a 92% load factor in at least nine of the prior twelve months; specified economic-development options begin at 15 MW.
Minimum payment
Greater of tariff charges or the contract minimum
Billing demand is no lower than the minimum load stated in the electric service agreement.
Minimum contract term
Contract-specific electric service agreement
The schedule requires an agreement stating contract length, minimum and maximum load, facilities, maintenance, and special charges rather than one public term for every customer.
- Service structure
- Extra High Load Factor retail scheduleEffectiveThe current tariff is a high-load-factor service schedule, not a statewide data-center mandate.
- Charges and assessments
- Voltage-specific demand and energy charges plus applicable ridersEffectiveThe published schedule applies rate components by service voltage and retains the otherwise applicable adjustment riders.
- Credit and collateral
- Contract-specific security and contribution obligationsEffectiveThe service agreement and facilities arrangement establish the customer's payment and security obligations; the public schedule does not state one universal collateral percentage.
- Grid infrastructure
- Customer-funded extra-high-voltage facilitiesEffectiveQualifying customers may use contribution-in-aid-of-construction arrangements and bear maintenance and replacement obligations specified in the agreement; APS may finance eligible contributions for up to ten years.
- Capacity protection
- Controllable-load credit may applyEffectiveA qualifying customer may receive a capacity credit when APS can control the load under the tariff conditions.
Official sources supporting these requirements
“Not specified” means the current official tariff record does not establish a normalized term. Retail tariff requirements are not inferred from wholesale-grid rules, interconnection processes, or pending policy proceedings.