Transmission, Markets, and Services Tariff

Created and authorized by the Federal Energy Regulatory Commission (FERC), ISO New England operates under the ISO New England Inc. Transmission, Markets, and Services Tariff. Known as the ISO Tariff, this document details: the rates, terms, and conditions for transmission, market, and other services provided by ISO New England; the rights and responsibilities of the ISO and market participants; and various schedules that define the revenues the ISO collects for its operations and those of the New England States Committee on Electricity (NESCOE). 

The ISO Tariff, in conjunction with the ISO’s Transmission Operating Agreements, also helps satisfy FERC requirements for the ISO’s functioning as a Regional Transmission Organization (RTO).

Section I–General Terms and Conditions

This section includes:

• General Terms and Conditions (07/09/2024)—defined terms and certain rights, privileges, and obligations of all parties, and actions they may or must take under the ISO Tariff
• Exhibit IA—The Financial Assurance Policy (08/27/2023)
• Exhibit IB (08/10/2017)—reserved for future use
• Exhibit IC (08/10/2017)—reserved for future use
• Exhibit ID—The Billing Policy (02/20/2023)

Section II—Open Access Transmission Tariff (OATT)

Visit the OATT page. The OATT:

• Helps ensure that all transmission owners and transmission customers have fair and open access to transmission service in New England
• Details the rights and responsibilities of transmission owners and transmission customers, as well as the procedures they must follow and the fees transmission customers must pay to access the transmission system
• Sets out the transmission system planning process for the region
• Sets out the cost recovery and allocation mechanisms for transmission and ancillary services in the region

Section III—Market Rule 1

Visit the Market Rule 1 page. Market Rule 1 governs the operation of New England’s wholesale electricity markets. It includes detailed information on pricing, scheduling, offering, bidding, settlement, and other procedures related to the purchase and sale of electricity.

Section IV—ISO Funding Mechanisms

This section details how ISO New England collects funds to pay for its functioning.

• Section IV.A—Recovery of ISO Administrative Expenses (01/01/2022) is known as the Self-Funding Tariff. It contains rates for the administrative functions of the ISO, including costs for scheduling and administering the movement of power through, out of, or within the balancing authority area; and costs for services the ISO provides to administer the energy and reliability markets. The collection of monies for NESCOE operation is also detailed, because the ISO acts as its billing and collection agent.
• Section IV.B—Capital Funding Arrangements Tariff (01/01/2014) describes how the ISO funds capital projects.

Attachments to the ISO Tariff

• Attachment A—Market Participant Service Agreement: (06/17/2013)

  This agreement provides the rights and responsibilities of businesses or organizations that generate, buy, sell, and transport electricity in the New England markets.

• Attachment A-1: (06/15/2013)

  This attachment is reserved for future filings.

• Attachment B—Pro Forma ITC Operating Agreement: (08/30/2010)
  

  This attachment is reserved for future filings.

• Attachment D—ISO New England Information Policy: (07/26/2024)

  This policy provides the rules and procedures the ISO and stakeholders follow in handling the information collected and created in the administration of New England’s wholesale electricity markets and the operation of the region’s transmission grid. See the List of Authorized Persons and Authorized Commissions per the Information Policy.

• Attachment E—Service Agreements: (06/17/2013)
  

  This attachment provides forms for service agreements under the ISO Tariff.

• Attachment F—Coordination Agreements: (05/04/2021)
  

  These agreements document the ISO’s coordination of operations with operators of neighboring control areas and the terms for pricing emergency energy and security energy. Other available agreements document the relationship among asset owners of the facilities subject to such coordination agreements.

  • ISO-NE/NYISO List of Interconnection Facilities
    Joint ISO-NE/NYISO document listing the ISO-NE/NYISO Interconnections and description of each of the interties that makes up those interconnections (previously included as a part of the Transmission, Markets, and Services Tariff-Attachment F).

• Attachment G—Procedure to Protect for the Loss of Phase II Imports: (08/30/2010)
  

  This procedure is designed to prevent the occurrence of a loss of Phase II contingency applicable when Phase II is operated in the isolated or synchronous mode.