Massachusetts electric distribution companies (Eversource/NSTAR, National Grid, Unitil)
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 2026-10-12
Applies atNo tariff threshold yet; policy threshold is above 25 MW peak demand
What the filing saysExecutive Order 658 (Sept 8, 2026) requires data centers above 25 MW peak to procure new clean generation matching annual consumption, and the DPU is to develop large-load rate schedules so other ratepayers do not fund data-center distribution upgrades. On Sept 24, 2026 the DPU directed the utilities to file reports on queued load projects above 25 MW and on all data-center projects above 1 MW (a reporting threshold, not a tariff). No tariff text or docket 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
mass.gov DPU directive to the electric distribution companies; trade coverage (taiyangnews.info) of Executive Order 658. Primary text partly unread.
Compare with other utilitiesEstimate the commitment in dollarsCheck a site in Massachusetts electric distribution companies (Eversource/NSTAR territory
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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.