GMP has 280 miles of transmission lines, and about 60 substations across the state. A majority of GMP’s transmission lines are operated at 34.5kV although the company has some 46kV and 69kV lines. A control center at the company's headquarters in Colchester operates 24 hours a day, and directs all switching for the transmission system. The controllers also direct the service restoration efforts on the transmission system, substations, and distribution lines involving substations, if there are outages or repairs needed. They also coordinate with Vermont Electric Power Company, better known as VELCO, the state's transmission company, as needed; and ISO New England, a regional transmission organization that monitors and ensures New England's constant power supply.
Open Access Transmission Information
On Feb. 1, 2005, ISO New England and participating transmission owners implemented a Regional Transmission Organization (RTO) governed by ISO New England FERC Electric Tariff No. 3 - Section II Open Access Transmission Tariff (RTO OATT). The RTO OATT superseded the OATT’s of all Participating Transmission Owners. The RTO OATT covers transmission service on all network facilities including pool transmission facilities and the Highgate Converter Facilities.
All transmission service types are briefly explained in the ISO New England matrix(see Transmission Service Types), which also contains application information.
OASIS: Registration information for access to the New England Open Access Same Time Information System (OASIS) may be found via:
Regional Network Service: Open access to integrate all resources to regional network load is provided under Schedule 9 – Regional Network Service of the RTO OATT. Application for Regional Network Service must be made to ISO New England. Call Bruce Kay at ISO New England at 413-535-4062 for more information.
- Schedule 9(See Section II Open Access Transmission Tariff)
Through or Out Service: Open access to utilize the Highgate Converter Facilities is provided under Schedule 8 – Through or Out Service of the RTO OATT. Application for Through or Out Service must be made to ISO New England. Call Bruce Kay at ISO New England at 413-535-4062 for more information.
- Schedule 8(See Section II Open Access Transmission Tariff)
Local Network or Point-to-Point Service: Open access to the GMP transmission system is provided under Schedule 21 – Common (common provisions applicable to local service from all local service providers) and Schedule 21 – GMP (provisions applicable to local service from GMP) of the RTO OATT. Application for firm or non-firm point-to-point transmission service over the GMP transmission system must be made to ISO New England. See link below for blank application. Call Chris Cole at GMP at 802-655-8464 for more information.
- Schedule 21
- Schedule 21- GMP
- Schedule 21 Firm and/or Non-Firm Point-to-Point Transmission Service over the GMP transmission system: Point-to- Point Application
Phase I/II HVDC Service: Open access to the GMP portion of the Phase I/II HVDC transmission facilities is provided under Schedule 20A – Point-to-Point Service over the Phase I/II HVDC Transmission Facilities and Schedule 20A of the RTO OATT. Application for firm or non-firm point-to-point transmission service over the GMP portion of the Phase I/II HVDC transmission facilities must be made to GMP. See link below for blank application. Call Chris Cole at GMP at 802-655-8464 for more information.
- Schedule 20A
- Application for Schedule 20A Firm and/or Non-Firm Point-to-Point Transmission Service over the GMP portion of the Phase I/II HVDC transmission facilities: Phase I/II HVDC-TF Application.
- Service Agreement for Firm and/or Non-Firm Point-to-Point Transmission Service over the GMP portion of the Phase I/II HVDC transmission facilities
- Form of PHASE I/II-TF Service Agreement For The Resale, Reassignment or Transfer of Long-Term Firm Point-To-Point Phase I/II HVDC-TF Service
Large Generator Interconnection: Large generator interconnections (over 20 MW) with the GMP transmission system are governed by Schedule 22 – Standard Large Generator Interconnection Procedures of the RTO OATT. A request for interconnectionwith the GMP transmission system must be made to ISO New England. Call Dave Forrest at ISO New England at 413-540-4584 for more information.
Small Generator Interconnection: Small generator interconnections (20 MW and under) with the GMP transmission system are governed by Schedule 23 – Standard Small Generator Interconnection Procedures of the RTO OATT. A request for interconnectionwith the GMP transmission system must be made to ISO New England. Call Dave Forrest at ISO New England at 413-540-4584 for more information.
Interconnection with GMP Distribution System: A request for interconnection with the GMP distribution system may be made to GMP by calling Chris Cole at GMP at 802-655-8464.
GMP Links:
FERC Order 2004 Standards of Conduct Information and other GMP OASIS related information can be found using the following link:
For customers with an OASIS digital certificate please use the following link:
