NYISO Tariffs --> Open Access Transmission Tariff (OATT) --> 26 OATT Attachment T - Cost Allocation Methodology For Sched
The Day-Ahead commitment of generating units includes sufficient Generators and/or Interruptible LoadResources to provide for the safe and reliable operation of the NYS Power System. In cases in which the sum of all Day-Ahead Bilateral Schedules, excluding schedules of Bilateral Transactions with Trading Hubs as their POWs, and all Day-Ahead purchases and sales of energy to serve Load within the NYCA is less than the ISO’s Day-Ahead forecast of Load, the ISO willmay commit Resources in addition to the reserves it normally maintains to enable it to respond to contingencies(“Additional Resources”). Payments for Bid Production Cost Gguarantees (“BPCG”) made to such aAdditional Resources are to be recovered under Schedule 1. These “BPCG to Additional Resources” shall be allocated to Transmission Customers, to the extent they are not acting as Suppliers, allocated pursuant to the methodology set forth below and recovered under Rate Schedule 1 of the OATT, on the basis of their Real-Time energy purchases in their Load Zones or Composite Load Zones (see below). By design, when the NYISO forecast load exceeds actual load, the methodology below will only be used to allocate part of the BPCG to Additional Resources. Any residualBPCG payments made to Additional Resources that are not allocated pursuant to this methodology shall be allocated to Transmission Customers according to the provisions of Schedule 1, Section 6.1.7.22.2.4.2., of Rate Schedule 1 of the OATT
For purposes of this Attachment T, “Eligible Transmission Customers” are Transmission Customers that are scheduled to sell Energy at a Load bus specified for Virtual Transactions in the Day-Ahead Market and Transmission Customers purchasing Energy to serve load in the real-time market at a Load bus that is not a Load bus specified for Virtual Transactions and not a Proxy Generator Bus. Load Zones and composite Load Zones used in the allocation of Bid Production Cost guarantee payments made to Additional Resources are initially set as: (i) Load Zones A-E, (ii) Load Zones F-I, (iii) Load Zone J, and (iv) Load Zone K and may be adjusted by the ISO to reflect the most frequently constrained transmission interfaces in the NYCA.
More specifically, BPCG payments made to Additional Resources shall be allocated to each Eligible Transmission Customer, to the extent that Transmission Customer is not acting as a Supplier as follows:
Where:
BPCGc | Obligation of Transmission Customer “c” for the Bid Production Cost |
BPCGNYCA | Total Bid Production Cost |
c | An Eligible Transmission Customer. |
J | Index for Load Zones or Composite Load Zones in the set NYCA |
D | Index for eligible transmission customers in the NYCA |
E | Set of all eligible transmission customers |
L | Load Zone or Composite Load Zone |
KfeL | A scale factor calculated for each Load Zone or Composite Load Zone that determines the portion of BPCG to Additional Resources that will be allocated through the procedures described in this attachment. |
KlocL | A scale factor calculated for each Load Zone or Composite Load Zone “L” |
Kcustomerc,L | A scale factor calculated for Eligible Transmission Customer “c” in Load Zone or Composite Load Zone “L” which determines the portion of the BPCG to Additional Resources allocated to that Load Zone or Composite Load Zone |
RTPactL | Net |
RTPactc,L |
|
RTPfcstL | The sum of (1) Day-Ahead sales for each hour of the day in the Day-Ahead market at the Load bus specified for Virtual Transactions in Load Zone or Composite Load Zone “L” by Eligible Transmission Customers |
KfeL shall be calculated as shown below except that the value zero shall be used if the expression below yields a negative number and the value one shall be used if the expression yields a number greater than one.
KlocL shall be calculated as shown below.
Kcustomerc,L shall be calculated as shown below.
The residual between Bid Production Cost GuaranteeBPCG payments not allocated to such aAdditional Resources not allocated according to the methodology described above shall be allocated to all Transmission Customers using the methods described in Schedule 1, Section 6.1.7.2. 2.2.4.2, of Rate Schedule 1 of the OATT. The residual is determined according to:
Load Zones and Composite Load Zones used in the allocation of Bid Production Cost Guarantees for such additional resources are initially set as: (i) Load Zones A-E, (ii) Load Zones F-I, (iii) Load Zone J, and (iv) Load Zone K and may be adjusted by the ISO to reflect the most frequently constrained transmission interfaces in the NYCA.
Effective Date: 9/30/2010 - Docket #: ER10-1866-000 - Page 1