ReferenceLarge-load power by market
Phoenix (APS): what a 50 MW connection costs under Arizona Public Service
What does a 50 MW connection cost in Phoenix (APS)?
In short. In Phoenix (APS), Arizona Public Service connects a 50 MW load under Extra High Load Factor (XHLF) rate update with minimum bill and collateral; long-term contracts with upfront contributions, docket ACC E-01345A-25-0105 (June 2025 rate case; pending). Minimum bill (level not public). Term: long-term contracts (length not public). Realistic energization: 2029. Open Factory's Large-Load Cost Table, as of August 21, 2026.
Facts
| Market | Phoenix (APS), AZ (APS (non-RTO)) |
|---|---|
| Utility | Arizona Public Service |
| Tariff or rule | Extra High Load Factor (XHLF) rate update with minimum bill and collateral; long-term contracts with upfront contributions |
| Docket | ACC E-01345A-25-0105 (June 2025 rate case; pending) |
| Status | pending |
| Large-load threshold | not published (XHLF class) |
| Study fee | not published |
| Security or collateral | collateral requirements (formula not public); upfront contributions to infrastructure under long-term contracts |
| Minimum bill | minimum bill (level not public) |
| Contract term | long-term contracts (length not public) |
| Ramp | not published |
| Exit fee | not published |
| CIAC exposure | customer funds new infrastructure through upfront contributions under long-term contracts (APS statement) |
| Realistic energization, 50 MW | 2029 |
| Verification | PARTIAL (utility statement and docket status verified; numbers not public) |
| Data as of | August 21, 2026 |
Questions
What does a 50 MW connection cost in Phoenix (APS)?
Arizona Public Service: study fee not published; collateral collateral requirements (formula not public); upfront contributions to infrastructure under long-term contracts; minimum bill minimum bill (level not public); term long-term contracts (length not public).
When can a 50 MW load be energized in Phoenix (APS)?
2029. JLL 2026 outlook: ~2.5 years average for a new 50 MW data center in Phoenix; APS had 4.5 GW committed and 19 GW in discussion (Aug 2025); Arizona task force flagged ~29 GW of proposed APS and SRP loads (Apr 2026).
Which tariff applies to large loads in Phoenix (APS)?
Extra High Load Factor (XHLF) rate update with minimum bill and collateral; long-term contracts with upfront contributions; docket ACC E-01345A-25-0105 (June 2025 rate case; pending); status: pending.
Is this rate proposed or approved?
Not yet final: pending. The table carries the filed terms and the docket to watch.
Sources
- Open Factory Large-Load Cost Table
- aps.com (accessed 2026-09-09)
- eta-publications.lbl.gov (Appendix 1)
- constructionowners.com (2026)
Data as of August 21, 2026. This page is rebuilt from the same table the Large-Load Interconnection Cost, the API and the MCP server read, so the figures cannot differ. Also available as plain markdown. Cite as Open Factory, Phoenix (APS): what a 50 MW connection costs under Arizona Public Service, August 21, 2026.
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