Graded Minimal and tightening on how it connects a new large load. 6 states, 4 actions with sources, reviewed 10 October 2026.
No special large-load rules are in force; ISO-NE's tariff filing is planned for November 16, 2026.
No collateral or capacity charge for large loads exists; the prompt seasonal auction is targeted for May 2028.
No curtailment obligation is in force; the capacity-matching requirement is a July 2026 proposal.
Nothing restricts co-location today, though the July 2026 proposal would require new large loads to bring new generation.
ISO-NE's July 20, 2026 report cites healthy reserve margins and under 300 MW in study but names winter gas pipeline limits and large-load tariff gaps.
Scored on rules in force, 1 to 5. 5 is the most regulated. Pending rules set the arrow.
ISO-NE counts only projects of 20 MW or more with formal transmission study agreements: two projects, 285 MW at most, in formal study (CELT May 2026); 395 MW preliminary nameplate pipeline 2026-2040 in Feb 2026, to be derated up to 50%. 2026 CELT: large loads add about 110 MW to summer and winter peak in the 2030s and about 130 MW in the 2040s, with no system impact before winter 2027/2028 isonewswire.com Pace: ISO-NE 2026 large load forecast: zero peak impact for the upcoming summer through summer 2027 and winter 2026/27; under 300 MW in formal study, nothing under construction. No in-service MW published.
New England has seen little large-load growth and has a comfortable supply margin, so ISO-NE has no special large-load rules in force. In answer to FERC's June 2026 order it has said it expects to require new large loads to bring their own new generation and to leave them out of the capacity requirement it buys for the region, so that existing customers do not pay for them. FERC granted a 90-day pause on 14 August 2026.
ISO-NE plans its tariff filing for 16 November 2026, with detailed rules to follow in 2027 after a stakeholder process. Its first prompt, seasonal capacity auction is targeted for May 2028.
ISO-NE is graded Minimal and tightening on how it connects a new large load: Plans to require new large loads to bring new generation New England has seen little large-load growth and has a comfortable supply margin, so ISO-NE has no special large-load rules in force. In answer to FERC's June 2026 order it has said it expects to require new large loads to bring their own new generation and to leave them out of the capacity requirement it buys for the region, so that existing customers do not pay for them. FERC granted a 90-day pause on 14 August 2026.
395 MW of large-load interconnection requests as of May 2026, of which 285 MW approved or contracted. ISO-NE counts only projects of 20 MW or more with formal transmission study agreements: two projects, 285 MW at most, in formal study (CELT May 2026); 395 MW preliminary nameplate pipeline 2026-2040 in Feb 2026, to be derated up to 50%.
Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont. Each state page gives that state's own laws, incentives and local actions, which sit under the grid's connection rules.
4 of 6: Connecticut, Maine, Massachusetts, New Hampshire.
ISO-NE plans its tariff filing for 16 November 2026, with detailed rules to follow in 2027 after a stakeholder process. Its first prompt, seasonal capacity auction is targeted for May 2028.
4 items: each is a law, order, tariff, ruling, utility action or local decision that changes what a data center must do, pay or disclose, or where it may be built. Failed and pending measures are marked. Each links to its source.
FERC issued the order on 18 June 2026 and granted a 90-day abeyance on 14 August. ISO-NE plans a section 205 tariff filing on 16 November 2026 covering the five reform areas FERC named, after a stakeholder process.
Source: iso-ne.comISO-NE told FERC in July 2026 that it proposes to require new large loads to bring new generation, modeled on SPP's interim service rules, and to exclude them from the Installed Capacity Requirement that sets capacity auction demand. The November filing will give notice of both; detailed rules come in 2027.
Source: climatesolutionslaw.comISO-NE is moving from a three-year-forward auction to a prompt, seasonal capacity market, with the first auction targeted for May 2028. It describes its supply position as long, with healthy reserve margins.
Source: climatesolutionslaw.comOrder 202-26-03 of 25 January 2026 directed units to run at maximum output during the winter storm; it was extended to 14 February.
Source: energy.govNeed the capacity sooner than the queue allows? Every unit in the register is held by Genloop, restored and re-warrantied, and can move on your timeline.
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