NOVEMBER 13-14, 2013|MARKETS COMMITTEE

Chris ParentCPARENT@ISO-NE.COM | 413.540.4599

Enhancements to reserve accounting

DARD Pump Reserve Designations

Self-Scheduled DARD are not designated for reserve due to software limitation• A generator and its corresponding DARD cannot be online at the

same time and if one generator at a station is generating then no DARD can be pumping

• Reserve Designations:– Generator and DARD Pump are not linked in ISO model for reserve

accounting within Unit Dispatch Software (UDS)– ISO Operations counts TMNSR on offline pumped storage generators

while not pumping– ISO Operations considers economically dispatched pumping DARD as

providing TMSR since the load can be curtailed immediately

• Currently, software limitations prevent UDS from counting reserve on a self-scheduled pump even though the load can be curtailed (i.e., is providing reserves)– Today, reserves from DARD pumps are accounted for in the reserve

monitor software, but manually approximated in the UDS

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Reserve Accounting on DARD Pumps can be enhanced with software improvements• Since self-scheduled pumping load can be immediately

curtailed, account for the full amount of operating reserve that is available with curtailment– No change in operating practice

• Unit Dispatch Software (UDS) will count TMSR on each self-scheduled pump equal to dispatch (DDP), similar to how reserves are calculated on an economically scheduled pump– This requires changes to UDS which will be in place Q2 2014

• Changes to ISO market settlement logic are also required to align settlement with operating reserve accounting and count reserve on self-scheduled pumps– Manual 28 requires modification

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Manual 28 – Market Rule 1 Accounting Manual

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Proposal Summary and Schedule

• Enhance dispatch software and settlement allows for more accurate accounting of reserves on self-scheduled DARD pumps

• The proposed scheduled is:– Markets Committee

• December 2013/January 2014– Participants Committee

• February 2014

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