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Transmission Rules, Rates and Tariffs

The interconnection process is governed by the OATT (Open Access Transmission Tariff). The following schedules are contained within the OATT.

Schedule 22Schedule 23Schedule 25
Standard Large Generator Interconnection Procedures Standard Small Generator Interconnection Procedures Elective Transmission Upgrade (ETU) Interconnection Procedure
Generating facilities that are more than 20 MW Generating facilities that are 20 MW or less New or upgraded transmission facility that the requesting entity has agreed to pay all associated costs

Additional Resources

Planning Procedure No. 5 (PP05) - Additional technical guidance on the interconnection process

Open Access Tariff - Open Access Transmission information available on ISO-New England's website

OASIS - Eversource's page on the Open Access Same-time Information System (OASIS) website

Required Postings

Open Access Transmission Information - Information pertaining to FERC Order 890 and 676-E

Transmission Rates - Current Eversource open access transmission service rates in Connecticut, New Hampshire and Massachusetts

FERC Order 717 Requirements - Information and disclosures pertaining to FERC Order 717 for Connecticut, New Hampshire and Western Massachusetts transmission

Transmission Interconnections

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Learn more about transmission interconnections