Arizona Public Service (APS), Extra High Load Factor (XHLF) rate
Large-load tariff for data centers: what is on file, the terms the filings state, and where each fact comes from. Terms a filing does not state are marked, never guessed.
StatusPending Last reviewed 2026-10-14
Applies atExisting XHLF: optional at 5,000 kW or more maximum demand and a 92% or higher load factor for at least nine of the prior 12 months. Proposed: mandatory for data centers that began service after January 2024 and similar large customers needing new generation outside APS's June 2025 resource plan.
What the filing saysPENDING CHANGES. APS's 2025 rate case (ACC Docket E-01345A-25-0105) proposes, per APS direct testimony (read): (1) data centers taking service after January 2024, and other similar large customers that need new generation not in APS's June 2025 resource plan, must take service on XHLF; (2) XHLF rates are updated to assign directly the cost of new generation built for load growth (about $1.57/kW of added production demand cost); (3) the market-price index option is replaced by a generation price based on the cost of the new resources, set in each customer's Electric Supply Agreement. APS also proposes changes to the minimum bill requirements. Reported: hearings ended in July 2026 and a Commission decision is expected by the end of 2026; no settlement was found. The ACC held a large-load workshop on April 16, 2026 (Docket E-00000A-25-0069).
Stated terms
This tariff does not yet have terms we can tabulate. The status text above is what the filings and our source state. See the source below.
Source
APS direct testimony of Jessica Hobbick in the 2025 rate case (APS investor site, read in part; the XHLF schedule attachments were not read); news coverage for hearing and decision timing; ACC news (azcc.gov).
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Screening information from public filings, not legal or investment advice. Tariffs change; confirm the current terms with the utility and the commission before relying on them.