California ISO (CAISO), large loads interconnection framework
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.
StatusLaw or process only Last reviewed 2026-10-30
Applies atNot a retail tariff -- an ISO-level interconnection framework for flexible large loads (data centers and similar) across CAISO's footprint
What the filing saysRULES_ONLY, NOT YET AT FERC. CAISO's Board of Governors approved a large-loads interconnection proposal on Oct 28, 2026, developed through CAISO's Large Loads stakeholder initiative (straw proposal posted Aug 11, 2026). Reported: the proposal creates new 'flexible interim load interconnection' service(s) letting large loads connect faster in exchange for enforceable curtailment flexibility tied to grid conditions, plus a monthly review window for large-load-driven transmission upgrades. CAISO is expected to file it at FERC by a Nov 16, 2026 deadline, responding to FERC's June 2026 Show Cause order on large-load interconnection delays. FERC had not acted as of Oct 30, 2026. This is a market/interconnection-process rule, not a retail rate tariff; it does not set a utility-specific MW threshold or billing terms, and it does not change PG&E's separate Rule 30 proceeding above.
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
publicpower.org coverage of the Oct 28, 2026 CAISO Board action (reported); CAISO Large Loads initiative straw proposal, Aug 11, 2026 (caiso.com, titles/summary read, not the full technical proposal); CAISO notices pages (caiso.com). The Board-approved final proposal and any FERC filing were not read directly.
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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.