Al McBride MANAGER, AREA TRANSMISSION PLANNING Existing Import Interfaces: Transmission Transfer Capabilities and The Calculation of Tie Benefits DECEMBER.

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Al McBride MANAGER, AREA TRANSMISSION PLANNING Existing Import Interfaces: Transmission Transfer Capabilities and The Calculation of Tie Benefits DECEMBER 17, 2014 | WESTBOROUGH, MA Reliability Committee

Agenda Describe the provisions that govern the development and use of import transfer capability for existing ties For illustration purposes, present the results of transfer capability analysis for RSP14 (2014 Regional System Plan) Describe the effect of new Elective Transmission Upgrades (ETU) on the development and use of import transfer capability for existing ties 2

PROVISIONS THAT GOVERN THE CALCULATION OF IMPORT TRANSFER CAPABILITY

4 FAC NERC Standard FAC ensures that Planning Coordinators have a methodology for, and perform an annual assessment to identify potential future Transmission System weaknesses and limiting facilities that could impact the Bulk Electric System’s ability to reliably transfer energy in the Near-Term Transmission Planning Horizon In New England, when identifying potential future Transmission System weaknesses, consideration will be given to rejected delist bids, generation retirements or other changes in system conditions

Alignment of Planning Processes NERC FAC activities are in alignment with – Regional System Plan (Attachment K): The Regional System Plan shall include the results of the annual assessment of transmission transfer capability, conducted pursuant to applicable NERC, NPCC and ISO New England standards and criteria and the identification of potential future transmission system weaknesses and limiting facilities that could impact the transmission system’s ability to reliably transfer energy in the planning horizon Each annual assessment will identify those portions of the New England system, along with the associated interface boundaries, that should be considered in the assessment of Capacity Zones to be modeled in the Forward Capacity Market pursuant to ISO Tariff Section III.12 – FERC 715 reporting of various aspects the transmission system and the transmission planning process 5

External import capability determinations – for use in FCM (Tariff Section III ) The import capability of all external interconnections with New England will be determined using studies of system conditions expected during the Capacity Commitment Period: Forecast 90/10 peak load Existing Generating Capacity Resources at their CNR Capability Existing Demand Resources reflecting their Capacity Supply Obligation Stressed Transfers The system will be modeled in a manner that reflects the design of the interconnection If an interconnection and its supporting system upgrades were designed to provide incremental capacity into the New England Control Area, simulations will assume imports up to the level that the interconnection was designed to support If the interconnection was not designed to be comparably integrated, simulations will determine the amount of power that can be delivered into New England over the interconnection 6

Analysis of the Delivery of Capacity To analyze the potential for the delivery of capacity over an existing external interface into New England: – For the study year and load level: Turn on New England Existing Generating Capacity Resources to their Capacity Network Resource Capability (CNRC) Turn on Existing Demand Resources Identify how much can be transferred into New England over the existing interface before reaching a constraint To analyze the potential to qualify new capacity within New England (overlapping impacts of new internal resources): – For the study year and load level: Turn on Existing Generating Capacity Resources to their CNRC Turn on Existing Demand Resources Increase imports to their limit or until an interface constrains Identify if there is any remaining headroom to qualify new internal capacity 7

EXAMPLE RESULTS OF THE APPLICATION OF THE CALCULATION PROCEDURES RSP14 – Transfer Capability Results

RSP14 Base Interface Limits (extract*) 9 *2014 Regional System Plan, Section 4.2

RSP14 Base Interface Limits, continued 1.Limits are for the summer period, except where noted to be winter – The limits may not include possible simultaneous impacts, and should not be considered as “firm” 2.The electrical limit of the New Brunswick-New England (NB-NE) Tie is 1,000 MW – When adjusted for the ability to deliver capacity to the greater New England Control area, the NB-NE transfer capability is 700 MW This is because of downstream constraints; in particular Orrington South 3.The Hydro-Quebec Phase II interconnection is a DC tie with equipment ratings of 2,000 MW. Due to the need to protect for the loss of this line at full import level in the PJM and NY Control Areas’ systems, ISO-NE has assumed its transfer capability for capacity and reliability calculation purposes to be 1,400 MW – This assumption is based on the results of loss-of-source analyses conducted by PJM and NY 10

RSP14 Base Interface Limits, continued 4.Import capability on the Cross Sound Cable (CSC) is dependent on the level of local generation 5.New York interface limits – These are without CSC and with the Northport Norwalk Cable at 0 MW flow – Simultaneously importing into NE and SWCT or CT can lower the NY-NE capability (very rough decrease = 200 MW) – Simultaneously exporting to NY and importing to SWCT or CT can lower the NE-NY capability (very rough decrease = 700 MW) 11

IMPORT TRANSFER CAPABILITIES AND THEIR USE IN THE CALCULATION OF TIE BENEFITS The effect of New ETUs

Increasing an Existing AC Interface An AC ETU with the objective of increasing the existing AC import capability: – An increase in capacity and energy import capability Once included in the FCM Network Model, the expanded PTF capability would be included in: – Tie benefits calculations – The transfer limit determining how many resources can clear over the interface in the FCM – Overlapping impact analysis of new internal resources 13 Existing Interface

A New Controllable MTF /OTF* ETU The new controllable MTF/OTF ETU will not affect the transfer capability of the existing interface – The tie benefits calculated for the existing tie(s) will be unaffected by the new ETU The existing tie(s) will still be analyzed using its own import capability with the neighboring Control Area modeled “at criterion” – The tie benefits for the new controllable ETU will be zero 14 ExistingNew *Controllable Merchant Transmission Facility/Other Transmission Facility

Summary All existing importing interfaces are evaluated annually using the same evaluation procedures, pursuant to: – NERC Standard FAC – Attachment K (Regional System Plan) – Tariff Section III Under the new ETU rules: – A new controllable External MTF/OTF will not affect the calculation of transfer capability or tie benefits on existing interfaces – An ETU to increase import capability across an existing external interface will be accounted for in transfer capability analysis and the resulting tie benefits calculations 15

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