X. Methodologies for Transmission Capacity

a. TTC Methodology

The TTC Methodology is described in Section 4 of the  TTC Methodology document.

For those non-PTF facilities that serve as a path for the Company’s Transmission Customers, the Company has calculated the TTC as the rating of the limiting line that constitutes that path.

b. ATC Methodology

The ATC Methodology is described in Section 7 of the ATC Methodology document .

For those non-PTF facilities that serve as a path for the Company’s Transmission Customers, the Company has posted the ATC as 9999.  ATC on these paths varies depending on the time of day.  However, it is posted with an ATC of "9999" to reflect the fact that there are no restrictions on these paths for commercial transactions

c. TRM Methodology

The TRM Methodology is described in Section 5 of the ATC Methodology document. 

TRM is the portion of TTC that cannot be used for reservation of firm transmission service because of uncertainties in system operation.  It is used only for interfaces under the physical reservation system.  The Company provides transmission service over their non-PTF facilities that are connected only to the New England system and they do not interconnect with other systems.  Therefore, the Northeast Utilities Companies do not reserve Transmission Reliability Margin for these lines. 

d. Capacity Benefit Margin

The CBM Methodology is described in Sections 6 of the ATC Methodology document.

Wherever applicable, the administration of Schedule 21 - VERMONT TRANSCO LLC is consistent with the services provided under the ISO-NE OATT by ISO-NE.  The Company provides transmission service over their non-PTF facilities that are connected only to the New England system and they do not interconnect with other systems.  Therefore, the Company does not reserve Capacity Benefit Margin for these lines