High load factor customers identified in APS's 2025 rate review are addressed through proposed changes to the XHLF (Extremely High Load Factor) Tariff, filed as part of a larger rate review to put reasonable cost-recovery terms and risk-based conditions in place for this customer class.
Also active in Arizona: APS is also serving a landmark manufacturing load: Taiwan Semiconductor's Phoenix fab expansion, now valued at $165 billion, ramping from 200 MW in its first phase to roughly 1,000 MW at full build-out. APS has proposed a 2,000 MW natural gas plant partially available to large-load customers under a subscription model.
Named Projects Already Underway
| Customer | Location | Details |
|---|---|---|
| Taiwan Semiconductor Manufacturing Company (TSMC) | Phoenix, AZ | $165 billion semiconductor manufacturing expansion, ramping to approximately 1,000 MW |
| Beale Infrastructure | Tucson, AZ (Tucson Electric Power) | data centre project; TEP estimates a typical residential customer will save about $13/month from the 300 MW of associated load growth |
Figures compiled from the Edison Electric Institute's "Large Load Projects and Tariffs" (September 2026) member-company summary and public regulatory filings. Confirm current tariff terms directly with Arizona Public Service (Pinnacle West) and the relevant state public utility commission before relying on any figure for a capital decision.
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