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Description

The Metered Energy Adjustment Factor (MEAF) Pre-calculation will perform the calculations necessary to implement the business rules identified in the Business Rules section below. In particular, the pre-calculation will provide ouput for the functional components listed with Business Rule 1.1. The association of each component with the various charge codes or pre-calculations that rely upon the Metered Energy Adjustment Factor Pre-calculation calculations is as follows:



Pre-calculation MEAF Component

Dependent Charge Code or Pre-calculation

Day-Ahead (DA) Metered Energy Adjustment Factor (MEAF)

Pre-calc IFM Net Amount

Real-Time Performance Metric

Pre-calc IFM Net Amount,
Pre-calc RUC Net Amount,
Pre-calc RTM Net Amount

Tolerance Band Flag for Day-Ahead MEAF Application

Pre-calc MEAF (for DA MEAF)

Tolerance Band Flag for RT Performance Metric Application

Pre-calc Start-up and Minimum Load Cost,
Pre-calc MEAF

Exceptional Dispatchal Metered Energy Adjustment Factor (ED MEAF)

CC 6482 – RT Excess Cost for Instructed Energy Settlement,
CC 6488 – Exceptional Dispatch Uplift Settlement

Determination of Persistent Deviation with 2-Hour Inspection Windows

Pre-calc MEAF (for Persistent Deviation Metric)

Persistent Deviation Metric

Pre-calc RTM Net Amount
Pre-calc Start-up and Minimum Load Cost


Charge Code Requirements

Business Rules





Bus Req ID

Business Rule



This pre-calculation shall be computed daily for each resource on a Dispatch Interval basis.



This precalculation configuration consists of calculations that generate results for the following functional components used by successor configurations:

  1. Day-Ahead (DA) Metered Energy Adjustment Factor (MEAF),

  2. Real-Time Performance Metric,

  3. Tolerance Band Flag for Day-Ahead MEAF Application,

  4. Tolerance Band Flag for RT Performance Metric Application

  5. Exceptional Dispatch Metered Energy Adjustment Factor,

  6. Determination of Persistent Deviation with 2-Hour Inspection Windows, and

  7. Persistent Deviation Metric

The calculated results shall be used by successor charge codes.



The Day-Ahead Metered Energy Adjustment Factor (DA MEAF) is a factor that serves to determine the portions of a Scheduling Coordinator’s resource’s relevant Day-Ahead Schedule that are to be included in the Bid Cost Recovery calculations based on the resource’s actual performance reflected in its Metered Energy. (Fact)



Effective Day-Ahead Scheduled Energy is defined to be the minimum of the Expected Energy and the Day-Ahead Scheduled Energy. (Fact)



The CAISO shall calculate the Day-Ahead Metered Energy Adjustment Factor for each resource through the following steps:










  1. For Generation Unit or resource Specific System Resource scheduled by CAISO in the Day-Ahead Market



      Step 1:

      If the resource’s Effective Day-Ahead Scheduled Energy is greater than or equal to its Day-Ahead Minimum Load Energy, and is greater than zero, then the calculation shall proceed to step two. Otherwise, the calculation shall proceed to step six.





      Step 2:

      If (1) the resource’s Metered Energy less Regulation Energy is less than its Day-Ahead Minimum Load Energy less the Tolerance Band; or (2) the resource’s Metered Energy less Regulation Energy is less than or equal to zero, then the Day-Ahead Metered Energy Adjustment Factor shall be set to zero (0). Otherwise, the calculation shall proceed to step three.





      Step 3:

      If the absolute value of the result of the resource’s Metered Energy less its Regulation Energy less the Effective Day-Ahead Scheduled Energy, is less than or equal to the Performance Metric Tolerance Band, then the Day-Ahead Metered Energy Adjustment Factor shall be set to one (1). Otherwise, the calculation shall proceed to step four.





      Step 4:

      If the resource’s Effective Day-Ahead Scheduled Energy less its Day-Ahead Minimum Load Energy is equal to zero, then the Day-Ahead Metered Energy Adjustment Factor shall be set to one (1). Otherwise, the calculation shall proceed to step five.





      Step 5:

The resource’s Day -Ahead Metered Energy Adjustment Factor (MEAF) shall be calculated asset to the minimum of:

    1. (A) the number one (1); or

    2. (B) the absolute valuemaximum of (i) the number zero (0), and (ii) the ratio of the resource’s

      1. (a) Metered Energy less the Day-Ahead Minimum Load Energy. and less the Regulation Energy, and

      the minimum of (i) the Expected Energy and (ii) the (b) the Effective Day-Ahead Scheduled Energy, less the Day-Ahead Minimum Load Energy. Then, the calculation shall proceed to step six.



      Step 6:

      If the resource’s Effective Day-Ahead Scheduled Energy is less than its Day-Ahead Minimum Load Energy and if the resource’s Effective Day-Ahead Scheduled Energy is greater than zero (0), then the resource's Day-Ahead Metered Energy Adjustment Factor shall be set to one (1). Otherwise, the calculation shall proceed to step seven.





      In cases where both the denominator and numerator produced by this calculation equal zero (0),Step 7:

      If the Day-Ahead Scheduled Energy is positive and the resource’s Expected Energy is less than or equal to zero, and its Metered Energy is less than or equal to zero,

      then the resource's Day-Ahead Metered Energy Adjustment Factor willshall be set to one (1);

      otherwise, the resource's Day-Ahead Metered Energy Adjustment Factor shall be set to zero (0).












  1. For Participating Load Pumped-Storage Hydro Unit or Pumping Load resource scheduled by CAISO to pump in the Day-Ahead Market



      Step 1:
      If the Day-Ahead Pumping Energy is negative and its Expected Energy is negative, then its Day-Ahead Metered Energy Adjustment Factor shall be the minimum of: (A) the number one (1); or (B) the maximum of (i) the number zero (0) and (ii) the ratio of the resource’s Metered Energy and its Expected Energy. Otherwise, the calculation shall proceed to step two.




      Step 2:
      If the denominator produced from this calculation equals zero (0), butDay-Ahead Pumping Energy is negative and the numerator is a non-resource’s Expected Energy is greater than or equal to zero, and its Metered Energy is greater than or equal to zero number, the, then its Day-Ahead Metered Energy Adjustment Factor willshall be be set to one (1). Otherwise, its Day-Ahead Metered Energy Adjustment Factor shall be set to zero (0).










  1. For a Non-Generating Resource



The metered energy adjustment factor will not apply to non-generator resources.



The CAISO will implement this in its software by simply setting the metered energy adjustment factor to “1” for all non-generator resources.









For the purposes of scaling a resource's Real-time Bid Cost Recovery amounts the Real-Time Performance Metric shall be calculated as the minimum of:

  1. the number one (1); or

  2. the absolute value of the ratio of the resource’s

    1. Metered Energy, less the Day-Ahead Scheduled Energy, and less the Regulation Energy, and

    2. the total Expected Energy less the Day-Ahead Scheduled Energy.



If the CAISO issues Real-Time Dispatch to the resource that is incremental to its Day-Ahead Schedule and the resource deviates downward from its Day-Ahead Schedule, the Real-Time Performance Metric will be set to zero (0).



If the CAISO issues Real-Time Dispatch to the resource that is decremental to its Day-Ahead Schedule and the resource deviates to a level above its Day-Ahead Schedule, the Real-Time Performance Metric will be set to zero (0).



If the resource’s total Expected Energy is equal to the Day-Ahead Scheduled Energy and if the Metered Energy minus Regulation Energy is equal to the Day-Ahead Scheduled Energy, then the Real-time Performance Metric is set to one (1).



If the resource’s total Expected Energy is equal to the Day-Ahead Scheduled Energy and if the Metered Energy minus the Regulation Energy is not equal to the Day-Ahead Scheduled Energy, then the Real-time Performance Metric is set to zero (0).



The Real-time Performance Metric is not applied during the time when a resource is Starting Up, Shutting Down, in an MSG Transition Period crossing over a Forbidden Operating Region, or the time period for which a Dispatch Operating Point correction is performed due to a verbal Dispatch Instruction issued by the CAISO Operator, as long as the resource is in fact in the operational mode instructed by the CAISO.



The Performance Metric Tolerance Band shall be applied to the Day-Ahead Metered Energy Adjustment Factor and the Real-Time Performance Metric calculations.



The Performance Metric Tolerance Band shall consist of the Tolerance Band plus an additional ramping tolerance.



For each Settlement Interval, the ramping tolerance is the difference between

  1. the Energy calculated based on the linear curve between two applicable Dispatch Operating Targets; and

  2. Expected Energy over the two applicable Dispatch Intervals.



The Tolerance Band is expressed in terms of Energy (MWh) for Generating Units, System Units and imports from Dynamic System Resources for each Settlement Interval and equals the greater of the absolute value of:

  1. five (5) MW divided by the number of Settlement Intervals per Settlement Period or

  2. three (3) percent of the relevant Generating Unit’s, Dynamic System Resource’s or System Unit’s maximum output (PMax), as registered in the Master File, divided by the number of Settlement Intervals per Settlement Period.



The maximum output (PMax) of a Dynamic System Resource will be established by agreement between the CAISO and the Scheduling Coordinator representing the Dynamic System Resource on an individual case basis, taking into account the number and size of the generating resources, or allocated portions of generating resources, that comprise the Dynamic System Resource. (Fact)



If for any given Settlement Interval, the absolute value of the resource’s Metered Energy less its Regulation Energy less the minimum of the Day-Ahead Schedule Energy and Expected Energy, is less than or equal to the Performance Metric Tolerance Band, then the CAISO will not apply the Day-Ahead Metered Energy Adjustment Factor to the IFM Energy Bid Cost or the IFM Market Revenue.



If for a given Settlement Interval the absolute value of the resource’s Metered Energy, less its Regulation Energy and less its Expected Energy, is less than or equal to the Performance Metric Tolerance Band, then the CAISO will not apply the Real-Time Performance Metric to the calculation of the RTM Energy Bid Cost, RUC and RTM Minimum Load Cost, or RTM Market Revenue.



The Persistent Deviation Metric is a threshold measurement used to evaluate a resource’s change in output between Settlement Intervals relative to the changed Dispatch by the CAISO between Settlement Intervals.



The Persistent Deviation Metric shall be applied by Settlement Interval and shall be applied for the twenty-four five-minute Settlement Intervals that comprise the previous two Trading Hours.



Thus, the evaluation window is a rolling two hours, incrementing in hourly Settlement Intervals.



The Persistent Deviation Metric for each Settlement Interval (t) is measured as the ratio of:

  1. Metered Energy in the prior Settlement Interval (t-1), less the Metered Energy in the given Settlement Interval (t); and

  2. Metered Energy in the prior Settlement Interval (t-1), less the Expected Energy in the given Settlement Interval (t), and less the Regulation Energy in the given Settlement Interval (t).



The CAISO will modify the Bid Cost Recovery calculations and Residual Imbalance Energy payments to address persistent deviations that expand Bid Cost Recovery payments beyond what is necessary for purposes of ensuring Bid Cost Recovery.



The CAISO will calculate the Persistent Deviation Metric and evaluate each resource’s response to a CAISO Dispatch in each Settlement Interval relative to the Persistence Deviation Metric Threshold.



The Persistent Deviation Metric Threshold evaluation will be based on the number of Settlement Intervals flagged within a rolling two-Trading Hour window.



The CAISO will flag each Settlement Interval pursuant to the following threshold conditions and apply the Persistent Deviation Metric pursuant to a set of rules for evaluating the resource's performance relative to the Performance Deviation Metric Threshold.



- Case 1 -

The CAISO will flag a Settlement Interval (t):



  1. if Expected Energy is greater than Day-Ahead Scheduled Energy in that Settlement Interval (t), the Metered Energy is greater than the Expected Energy in that Settlement Interval (t), and the Metered Energy in the prior Settlement Interval (t-1) is less than the Expected Energy in the given Settlement Interval (t); and

  2. if the Metered Energy less, Regulation Energy, less Expected Energy in that Settlement Interval (t) is greater than ten (10) percent of the amount the resource can be Dispatched at full ramp over the Settlement Interval (t) and the Persistent Deviation Metric is greater than one hundred and ten (110) percent.



- Case 2 -

The CAISO will flag a Settlement Interval (t):



  1. if the Expected Energy exceeds the Day-Ahead Schedule Energy in that Settlement Interval (t), and Metered Energy exceeds the Expected Energy in that Settlement Interval (t) and Metered Energy in the prior Settlement Interval (t-1) exceeds the Expected Energy in the given Settlement Interval (t); and

  2. if the Metered Energy less the Regulation Energy and less Expected Energy in that Settlement Interval (t) is greater than ten (10) percent of the amount the resource can be Dispatched at full ramp over the Settlement Interval (t) and the Persistent Deviation Metric is less than ninety (90) percent.



- Case 3 -

The CAISO will flag a Settlement Interval (t):



  1. if the Expected Energy is less than the Day-Ahead Schedule Energy, and Metered Energy is less than the Expected Energy in that Settlement Interval (t), and Metered Energy in the prior Settlement Interval (t-1) is less than the Expected Energy in the given Settlement Interval (t); and

  2. if the Metered Energy less Regulation Energy less Expected Energy in that Settlement Interval (t) is greater than ten percent (10) of the amount the unit could be Dispatched at full ramp over the Settlement Interval (t) and the Persistent Deviation Metric is less than ninety (90) percent.



- Case 4 -

The CAISO will flag a Settlement Interval (t):



  1. if the Expected Energy is less than the Day-Ahead Schedule Energy, and Metered Energy is less than the Expected Energy in that Settlement Interval (t), and Metered Energy in the prior Settlement Interval (t-1) is greater than the Expected Energy in the given Settlement Interval (t); and

  2. if the Metered Energy less Regulation Energy less Expected Energy in that Settlement Interval (t) is greater than (10) percent of the amount the resource can be Dispatched at full ramp over the Settlement Interval (t) and the Persistent Deviation Metric is greater than one hundred and ten (110) percent.



The ISO will apply the following rules to evaluate the resource’s performance relative to the Persistent Deviation Metric Threshold and will apply any attendant bid cost basis modification specified with each rule.



- Rule 1 -

If six (6) or fewer Settlement Intervals out of the previous twenty four (24) Settlement Intervals of the rolling two-Trading Hour persistent deviation evaluation window are flagged as exceeding the Persistent Deviation Metric Threshold, then:



  1. the RTM Energy Bid Costs will be based on the applicable Energy Bid price, as mitigated, and

  2. Residual Imbalance Energy is settled based on the reference hour Energy Bid.



- Rule 2 -

If seven (7) or more Settlement Intervals of the previous twenty four (24) Settlement Intervals of the rolling two-Trading Hour persistent deviation evaluation window are flagged as exceeding the Persistent Deviation Metric Threshold, then for all the previous twenty four (24) Settlement Intervals in the two-hour window:



  1. the RTM Energy Bid Costs

    1. for Optimal Energy above the Day-Ahead Scheduled Energy will be based on the lesser of the applicable Default Energy Bid price, the applicable Energy Bid price, as mitigated, or the applicable FMM or RTD Locational Marginal Price, and

    2. for Optimal Energy below the Day-Ahead Scheduled Energy the greater of the applicable Default Energy Bid price, the applicable Energy Bid price, as mitigated, or the applicable FMM or RTD Locational Marginal Price; and

  1. the Residual Imbalance Energy Bid Cost

    1. for Residual Imbalance Energy above the Day-Ahead Scheduled Energy will be based on the lesser of the applicable Default Energy Bid price, the relevant Energy Bid Price, as mitigated, or the applicable RTD Locational Marginal Price, and

    2. for Residual Imbalance Energy below the Day-Ahead Schedule Energy will be based on the greater of the applicable Default Energy Bid price, the relevant Energy Bid Price, or the applicable RTD Locational Marginal Price.



- Rule 3 -

Once a Settlement Interval is flagged as exceeding the Persistent Deviation Metric Threshold, it remains flagged when it is considered in the subsequent rolling two-Trading Hour evaluation window and its bid basis qualification for that Settlement Interval will not change.





- Rule 4 -

If a Settlement Interval’s bid basis is determined by the Rule 1 above in a previous evaluation and it has not been flagged, it can be re-determined and flagged pursuant to the additional rules in a subsequent rolling two-Trading Hour evaluation window based on the Persistent Deviation Metric Threshold.





PTB Charge Adjustment does not apply to the Metered Energy Adjustment Factor Pre-calculation process. (Fact)



For the calculation of Real-Time Bid Cost Recovery an EIM base schedule that is nonzero shall be treated as a Self-Schedule for which the Resource will not be eligible for recovery of Start-Up Costs and Minimum Load Costs, in accordance with the treatment of costs during self-commitment intervals.



For the calculation and application of the Real-Time Performance Metric an EIM base schedule that is nonzero shall be treated as a Day-Ahead Schedule.



For the calculation and application of the Persistent Deviation Metric an EIM base schedule that is nonzero shall be treated as a Day-Ahead Schedule.



PTB Charge Adjustment does not apply to the Metered Energy Adjustment Factor Pre-calculation process. (Fact)



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