Available Capacity

ISO-NE posts daily on behalf of GMP the GMP share of TTC for Phase I/II based on a 9.26191% share of Phase I/II (combined percentage interest per Restated Use Agreement effective 9/1/2001). The GMP TTC share is 185 MW based on a maximum TTC of 2000 for Phase I/II. The Phase I/II share includes interconnection rights of others per a brokering agreement with GMP. Effective April 1, 2003 GMP began brokering for Fitchburg Gas and Electric Light Company and Unitil Power Corp. based on a signed Brokering and Agency Agreement (Agreement). The Agreement provides for GMP to sell the Phase I/II Interconnection rights of Interconnection Rights Holders that are parties to the Agreement. The Aggregate Brokered Transmission Capacity is the sum of the available Phase I/II capacity of GMP and the two Other IRH that are parties to the Agreement.

Additionally, effective January 1, 2011 and extending to December 31, 2012 Braintree Electric Light Department assigned their use rights to GMP.

GMP Marketing has yearly Firm reservations for all of their available Phase I/II transmission rights on OASIS for the purpose of serving their long term Vermont Joint Owners (VJO) Contract. GMP releases unused capacity at the start of the operating horizon for GMP; specifically at 16:00 eastern prevailing time 2 business days prior to service. For example, Monday at 16:00 EST, the operating horizon would be set until Wednesday at 24:00. It would remain that way until Tuesday at 16:00 EST at which point unscheduled Firm capacity would be released for resale Thursday through 24:00. Thursday at 16:00 EST, unscheduled Firm capacity would be released through Sunday at 24:00; Friday at 16:00 EST capacity would be released through Tuesday at 24:00. GMP will offer this released capacity on a non-firm basis only.

Currently, the brokering agreement limits the sale of brokered transmission capacity to non-firm sales. As a result of this and the above and based on a TTC of 2000, GMP offers 26 MW non-firm service over Phase I/II beyond the operating horizon with a maximum term of one month. For hourly and daily service in the operating horizon, GMP will offer all transmission released as non-firm as outlined above. The amount of service release will vary from day to day, but GMP will offer at least 26 MW of non-firm service at all times and up to 185 MW of non-firm service for some hours depending on how much Firm service is released based on a TTC of 2000.

For northbound service, the maximum TTC for Phase I/II transmission from NEPOOL to Quebec is 1200 MW, resulting in ATC of 114 MW based on the combined percentage interest of the Aggregate Brokered Transmission Capacity and assigned rights of 9.57385%.

TTC data for Phase I/II and Highgate is updated daily by ISO-NE. See link: TTC Data included HQ I/II on GMP OASIS information menu.

Notes:
(1) Interconnection and Interconnection Rights Holders (IRH) are defined in the Third Amended and Restated Agreement with Respect to the Use of Quebec Interconnection, effective September 1, 2001.