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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 22 | Schedule 23 | Schedule 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
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Transmission Interconnections
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