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FERC approves ISO-NE review of transmission replacement projects

FERC approves ISO-NE review of transmission replacement projects

Rule Changes

Grid operator gains new role reviewing utility-planned asset condition projects

October 20th, 2026: ISO-NE confirms January 1 start for reviewer role

Overview

Updated Oct 24

The Federal Energy Regulatory Commission approved ISO New England's plan to review utility-planned transmission replacement projects. The order, issued October 16, 2026, takes effect January 1, 2027. The review is advisory: ISO New England reports its conclusions to its Planning Advisory Committee but does not decide whether a project proceeds or rule on whether its costs are prudent.

ISO New England will review projects forecast to cost $25 million or more on a single line or at one station within five years, and programs costing $100 million or more. Smaller programs also qualify if they touch at least 15% of a utility's lines or substations, spend more than $5 million on any one, and total at least $25 million over five years or less. Transmission owners expect about $5 billion in such projects by 2034, including roughly $1.3 billion in 2027, according to a June ISO New England presentation.

Why it matters

New England's grid operator will now scrutinize billions in utility-planned transmission replacements and report to its Planning Advisory Committee on need and cost-effectiveness.

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Key Indicators

$5 billion
Transmission replacement pipeline under review
Asset condition spending transmission owners expect through 2034, per a June ISO New England presentation.
$25 million
Individual project review threshold
Projects at or above this cost on a single line or station, within five years or less, trigger review.
$100 million
Program review threshold
One route to review: programs at or above this cost. Smaller programs can also qualify under a separate test.
$1.3 billion
Expected spending next year
Asset condition projects transmission owners expect to add in 2027, per the June ISO New England presentation.
2027-01-01
Effective date
ISO-NE formally assumes the Asset Condition Reviewer role.

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People Involved

David Rosner
David Rosner
FERC Commissioner
Concurring with the order
 Judy Chang
Judy Chang
FERC Commissioner
Concurring with the order

Organizations Involved

ISO New England
ISO New England
Regional transmission organization
Newly designated Asset Condition Reviewer

The grid operator for New England, now responsible for independently reviewing utility-planned transmission replacement projects.
Federal Energy Regulatory Commission (FERC)
Federal Energy Regulatory Commission (FERC)
US federal regulator
Approved the proposal

The federal agency that regulates interstate electricity transmission, which approved ISO-NE's asset condition review role.
Eversource
Eversource
Utility
Withdrew one project during interim review

A New England utility that paused a proposed $82.4 million project after an ISO-NE consultant questioned its near-term need.
NE
New England States Committee on Electricity
State Organization
Supported the proposal

The organization representing the six New England states, which supported the proposal and filed comments with FERC.

Timeline

August 2026 October 2026

5 events Latest: October 20th, 2026 · 3 weeks ago
Tap a bar to jump to that date

  1. ISO-NE confirms January 1 start for reviewer role

    Latest Announcement

    ISO Newswire reports FERC accepted the proposal, with tariff and Transmission Operating Agreement changes taking effect January 1. The grid operator calls the role the first of its kind in the U.S.

  2. Utility Dive reports FERC approval

    Reporting

    Utility Dive publishes the approval, noting commissioners urged other regions to adopt similar review processes.

  3. FERC accepts ISO-NE's review proposal

    Regulatory Decision

    FERC issues order accepting the tariff and TOA revisions, effective January 1, 2027. Rosner and Chang concur, urging other regions to follow.

  4. Eversource pauses $82.4 million project

    Decision

    Eversource pauses a proposed project near Boston after an ISO-NE consultant questions its near-term need during interim review.

  5. ISO-NE files asset condition review proposal

    Filing

    ISO-NE, NEPOOL, and Participating Transmission Owners jointly file to establish ISO-NE as the Asset Condition Reviewer.

Scenarios

1

Other grid operators adopt ISO-NE's review model

Possible Resolves by End of 2027

Discussed by: FERC Commissioners David Rosner and Judy Chang

Both commissioners urged other regions to adopt similar review processes in their concurring statements. If another RTO or ISO files a similar proposal, the model could become a national standard for transmission oversight.

2

Review process cuts transmission replacement spending

Possible Resolves by End of 2028

Discussed by: NESCOE, consumer advocates

Eversource withdrew one project during the interim review after questions about its need. If the pattern continues, the review process could reduce the $5 billion pipeline of planned replacements and save consumers money.

3

Process faces implementation friction

Unlikely Resolves by Q2 2027

Discussed by: NESCOE comments

The role is advisory only, and ISO-NE will not make legal findings on cost prudence. PTOs could resist findings, and FERC may need to intervene if disputes arise over project need or cost-effectiveness.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

August 2003

Northeast blackout (2003)

A cascading blackout left 50 million people without power across the Northeast and Midwest. The outage traced to a transmission line failure in Ohio that cascaded across the region.

Then

Congress passed the Energy Policy Act of 2005, giving FERC authority to enforce mandatory reliability standards.

Now

Reliability standards became legally binding, shifting grid oversight from voluntary industry cooperation to federal regulation.

Why this matters now

Like the blackout, the current change adds federal oversight to the grid. The blackout led to reliability standards; the current change adds cost-effectiveness review of transmission replacements.

April 1996

FERC Order 888 (1996)

FERC required utilities to provide non-discriminatory access to their transmission lines, leading to the creation of independent system operators and regional transmission organizations.

Then

Vertically integrated utilities opened their transmission systems to competitors, and ISOs formed to operate regional grids.

Now

The ISO model became the standard for grid operation, with independent operators managing markets and reliability.

Why this matters now

The current change extends the ISO model by giving ISO-NE oversight of local transmission spending, a function previously left to utilities themselves.

Sources

(11)
+5
Utility Dive Federal Energy Regulatory Commission NESCOE MGrid ISO Newswire RTO Insider ISO New England ISO Newswire ISO New England ISO New England ISO New England