New England ISO (ISO New England)

New England ISO (ISO New England)
Name	ISO New England
Formation	1997
Headquarters	Holyoke, Massachusetts
Region served	Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont
Leader title	President and CEO
Leader name	Gordon van Welie

New England ISO (ISO New England) is the independent system operator that coordinates New England's bulk electric power system and wholesale electricity markets across six states. It operates the regional transmission grid, administers competitive markets, and plans for resource adequacy and transmission expansion amid shifting generation mixes and policy goals. The organization interacts with state regulatory bodies, regional stakeholders, and federal agencies on reliability, market design, and integration of offshore wind and renewable energy resources.

Overview

ISO New England manages the high-voltage transmission system serving Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It operates the New England power grid to balance supply and demand in real time, administers day-ahead and real-time wholesale markets, and conducts long-term planning through regional transmission expansion and resource adequacy assessments. The ISO coordinates with entities such as the Federal Energy Regulatory Commission, North American Electric Reliability Corporation, regional transmission owners like National Grid and Eversource Energy, and independent generators including Exelon and NextEra Energy.

History

Formed after the restructuring of the Public Utility Regulatory Policies Act of 1978-era frameworks and in response to the California electricity crisis, ISO New England began operations in the late 1990s to replace vertically integrated utilities’ control of dispatch. The ISO’s development was shaped by decisions of the Federal Energy Regulatory Commission and precedents from other RTOs such as PJM Interconnection and New York Independent System Operator. Early milestones included implementation of locational marginal pricing, creation of capacity markets, and adoption of market rules influenced by stakeholders including the New England States Committee on Electricity and the Independent Market Monitor.

Structure and Governance

The ISO is governed by a board of directors and executive leadership that report to stakeholders and be subject to oversight by the Federal Energy Regulatory Commission. Its stakeholder governance processes include committees like the Participants Committee and working groups that engage utilities, transmission owners, generators, consumer advocates, and state officials. Transmission owners in the region include ISO New England transmission owners such as Avangrid, Eversource Energy, and Northeast Utilities-related entities, while market participants range from merchant developers to municipal utilities like Consolidated Edison subsidiaries and regional cooperatives.

Market Operations and Programs

ISO New England administers wholesale electricity markets including the energy market, capacity market known as the Forward Capacity Market, and ancillary services markets. The ISO operates a day-ahead market and a real-time market using locational marginal pricing to reflect transmission constraints and congestion, similar to mechanisms in PJM Interconnection and the California Independent System Operator. Programs include demand response initiatives, financial transmission rights, and market mitigation enforced by the Independent Market Monitor to prevent market power abuse. The ISO has implemented tariff changes and market reforms proposed by stakeholders and approved by the Federal Energy Regulatory Commission.

Grid Reliability and Planning

Reliability planning is coordinated with the North American Electric Reliability Corporation standards and regional planning bodies like the New England States Committee on Electricity and transmission owners. The ISO produces multi-year Forecasts and the Regional System Plan to identify transmission upgrades, generation retirements, and system reinforcements. It conducts resource adequacy studies, seasonal assessments, and outage coordination with entities such as U.S. Department of Energy offices and neighboring control areas including New York ISO and PJM Interconnection for tie-line contingencies.

Renewable Integration and Decarbonization Initiatives

Facing state-level decarbonization mandates in Massachusetts and Rhode Island, the ISO has undertaken initiatives to integrate offshore wind projects, large-scale solar power arrays, and distributed resources such as battery energy storage and demand response. Planning efforts align with state procurements, Regional Greenhouse Gas Initiative-related policies, and interconnection queue reforms involving developers like Vineyard Wind and Deepwater Wind affiliates. The ISO evaluates transmission solutions, clustering interconnection studies, and market rule changes to accommodate increasing variable renewable generation and storage deployments.

Criticisms and Controversies

ISO New England has faced criticism over market rules, capacity market design, and prices affecting consumer bills, drawing scrutiny from state attorneys general, consumer advocates, and market participants. Controversies include debates over treatment of nuclear subsidies for plants such as Millstone Nuclear Power Station and Seabrook Station, interconnection queue backlogs involving renewable developers, and disputes over transmission cost allocation for regional upgrades. Stakeholders have petitioned the Federal Energy Regulatory Commission and state regulators for reforms to address reliability, affordability, and fairness in market outcomes.

Category:Energy in New England Category:Independent system operators