Avista (Washington and Idaho), large-load service
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 2026-10-14
Applies atNo tariff threshold; the first deal is 125 MW growing toward 500 MW
What the filing saysLOWER CONFIDENCE. Avista has no large-load tariff. It signed a non-binding agreement on May 29, 2026 with a data center developer in its Washington territory (125 MW from 2029, a path to 500 MW by 2032), subject to Washington UTC approval, then said on June 12 it would pause processing large data center requests while rules are developed. The Washington UTC is writing rules and a tariff for large energy loads. Avista says the customer would pay the added power supply, transmission and infrastructure costs. No Idaho tariff was found.
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
Spokesman-Review, KXLY and Inlander coverage of the Avista agreement (2026); UTC rulemaking not read.
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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.