FERC Turns Scrutiny on New England Grid as States Challenge Asset-Condition Reviews
Federal regulators ordered ISO-NE to justify or rewrite its large-load tariff terms, amplifying a state-led push to tighten oversight of how transmission owners claim asset-condition exemptions.
The Federal Energy Regulatory Commission voted unanimously on June 18 (2026-06-18) to issue show-cause orders to all six major regional transmission organizations under its jurisdiction, directing each to either defend or overhaul their existing tariffs governing how large new electricity loads connect to the grid. ISO-NE is among the operators now required to respond.3
The action landed as New England's state governments were already pressing federal regulators over a separate but related problem: how transmission owners can claim asset-condition exemptions — labelling network upgrades as maintenance necessary to preserve aging infrastructure rather than as capacity expansion — to avoid competitive review and secure cost recovery directly from ratepayers. FERC's show-cause orders add a second regulatory front to an oversight dispute that has been building for months.2,3
In testimony filed on Monday (2026-06-01), the New England States Committee on Electricity told FERC that New England "severely lacks" regulatory oversight of asset-condition projects.2 States singled out Eversource Energy's X-178 transmission line proposal in New Hampshire as an example, calling it a project that "epitomizes" the case for reform in how ISO-NE reviews such requests.
Eversource rejected that characterisation. The company said the X-178 project had been "extensively reviewed" through ISO-NE's Planning Advisory Committee process and argued that state critics had failed to identify any rule the utility had violated. It also denied allegations that project scope or timing had been shaped by compensation incentives — a position the states had implied was a structural bias toward asset expansion.2
The classification matters for ratepayers because work designated as asset-condition maintenance bypasses competitive solicitation and is allocated to regional customers through rate base, giving transmission owners a financial incentive to characterise investments broadly. State advocates argue the current oversight framework provides insufficient visibility into how that line is drawn.2
FERC's Section 206 show-cause process puts the burden on ISO-NE to demonstrate its tariff terms are just and reasonable, or to propose alternatives.3 The commission issued tailored orders to each of the six affected operators rather than a single uniform directive — a structure suggesting the agency identified specific concerns with individual tariffs. That approach is consistent with the broader federal push that began in late 2021, when FERC directed all six major regional operators outside Texas to establish programs for improving transmission capacity as demand from data centres and large industrial loads accelerated.1
ISO-NE real-time power prices at the Massachusetts Hub stood at $47.18 per megawatt-hour as of Friday's close (2026-06-26). The link between tariff rules and day-to-day spot prices is indirect, but the asset-condition classification dispute carries direct implications for how future transmission capacity is planned, who bears the cost, and how quickly projects clear regulatory review.3
Eversource's response to NESCOE's complaint will set a template for how other regional transmission owners frame future project filings. Whether FERC sides with the states on documentation and competitive-comparison requirements — or accepts the utilities' position that existing rules are adequate — will determine how much additional regulatory friction is added to New England's transmission build-out.2