Payment Acceleration Meter Data Estimation

Transcription

1 Payment Acceleration Meter Data Estimation Jill Powers Manager, Operations Data and Compliance Stakeholder Conference Call September 18, 2008

2 Purpose of Today s Meeting Clarify where we are at in the process Share the feedback we have already received Have open dialog to share comments / concerns / suggestions Identify the next steps Future Considerations 2Slide 2

3 CAISO Stakeholder Process Payment Acceleration We are here Project Project is is triggered triggered Issue Issue ID ID Paper Paper or or Study Study Plan Plan Straw Straw Proposal Proposal or or Study Study Results Results Final Final Draft Draft Proposal Proposal Board Board of of Governors Governors FERC FERC Opportunities for Stakeholder Input

4 Agenda Meter Data Submission and Estimation Proposals Initial White Paper White Paper Feedback Previous PAT Stakeholder Proposal DA Settlement Bifurcation (Calpine Proposal) Estimation Proposal Issues Meter Estimation using Current SAMC functionality in Credit Run Forecast/actual demand data Measurement File concept review 4Slide 2

5 Initial White Paper Proposal Meter Data (ISO polled + SC submitted) at T+5B and estimate remaining obligations based on schedules or forecasts applying a pre-determined estimation risk factor Estimation risk factor was never determined Schedules were assumed to be For load =Scheduled Demand: The MW of Energy of Demand cleared through the IFM and set in the Day-Ahead Schedule for the next Trading Day. For generation =Scheduled Generation: The MW of Energy of Generation cleared through the IFM and set in the Day-Ahead Schedule for the next Trading Day. Forecasts was not defined 5Slide 2

6 Proposal Based on White Paper Feedback Meter Data (ISO polled + SC submitted) at T+5B and estimate remaining obligations based on schedules. Schedules were again assumed to be For load =Scheduled Demand: The MW of Energy of Demand cleared through the IFM and set in the Day-Ahead Schedule for the next Trading Day. For generation =Scheduled Generation: The MW of Energy of Generation cleared through the IFM and set in the Day-Ahead Schedule for the next Trading Day. OR, For generation can also =Expected Energy: The total Energy that is expected to be generated or consumed by a resource, based on the Dispatch of that resource, as calculated by the Real-Time Market (RTM), and as finally modified by any applicable Dispatch Operating Point corrections Noting Forecast information could be used to increase DA Scheduled Demand to reflect Actual Forecast. 6Slide 2

7 Previous PAT Stakeholder Proposal Meter Data (ISO polled + SC submitted measurement file ) at T+5B and estimate remaining obligations Measurement file guidelines provided (noting measurement file guidelines could be used for any proposed early data submittal methodology). The CAISO would not dictate the exact method to calculate the SC submitted measurement file; however, the CAISO can provide some guidance on what would be reasonable approaches. Estimating remaining obligations (noting estimation would need to be updated for MRTU): For a load resource, the CAISO will use the final hour ahead schedule and add 10%; For a generation resource, the CAISO will use the final hour ahead schedule and subtract 10%; If no schedule is available, the CAISO will use a historic average and add 10% for a load resource or subtract 10% for a generator 7Slide 2

8 Calpine Proposal DA Settlement Bifurcation CAISO is still evaluating the impacts and benefits of this proposal Since the Day Ahead Market is not dependent on meter data, the need to estimate meter data would be eliminated CAISO is evaluating the level of effort between the changes to implement meter data estimation versus DA Settlement bifurcation CAISO is seeking input from Market Participants on the level of effort to implement meter data estimation versus DA Settlement bifurcation 8Slide 2

9 Estimation Proposal Issues Using all DA Demand and Generation Schedules does not take into account RT changes. Settlements will calculate all DA and RT charges and will create large deviations for RT calculations due to Expected Energy vs. DA schedule differences in Generation. Using a combination of Actual (i.e. polled generation) VS DA values (i.e.. schedules only) will create imbalance most likely between payments due Resources and payments received by Demand. 9Slide 2

10 Charge Codes Largely Impacted Using DA Schedules ONLY: The largest impact to charge codes will be related to Uninstructed Energy net negative deviation) to resources due to Metered Quantities < Expected Energy. Real Time CC Number Charge Code 6471 RT Instructed Imbalance Energy Settlement Resource receives payment based on expected energy of Resource 6475 RT Uninstructed Imbalance Energy Settlements Resource receives charge based on net negative deviation of Resource 6486 RT Excess Cost for Instructed Energy Allocation Resource receives charge based on net negative deviation of Resource 10Slide 2

11 Charge Codes Largely Impacted Using DA Schedules ONLY: Impact to A/S Obligations (Spin, Non Spin, Regulation) CC Number Charge Code 6090,6196,6296, 6596, 6696 A/S Neutrality Allocation Obligations are less than required/awarded Load and Exports receive charges Impact to GMC due to uninstructed deviations of resources CC Number Charge Code 4506,4535, 4536,4546 Various GMC Charges Resources charged based on instructed energy AND charges for net negative deviations 11Slide 2

12 Charge Codes Largely Impacted Using Polled (Actual) vs Estimated (Submitted and/or Estimated Meter Data Using DA Schedules): The largest impact to charge codes will be related to measured demand significantly less than Energy Settlement. Metered Demand < Energy Settlement Real Time CCNumber Charge Code 6474 RT Unaccounted for Energy Settlement Metered Demand allocated charges for cost of over generation (gen>load) 6475 RT Uninstructed Imbalance Energy Settlements 6477 Real Time Imbalance Energy Offeset 6480 Excess Cost Neutrality Allocation Measured Demand allocated charges to obtain neutrality in Energy Settlement 12Slide 2

13 Charge Codes Largely Impacted Using Polled (Actual) vs Estimated (Submitted and/or Estimated Meter Data Using DA Schedules): Impact to A/S Obligations (Spin, Non Spin, Regulation) CCNumber Charge Code 6090,6196,6296, 6596, 6696 A/S Neutrality Allocation Obligations are less than required/awarded Load and Exports receive charges 13Slide 2

14 Proposal to use Credit Liability Meter Data Estimation (current functionality in SAMC) CAISO currently has functionality to estimate Meter Data in SAMC based on logic used in T+7 Credit Liability Calculation. For a load resource, the CAISO will uses the IFM DA schedule and adds 10% For a generation resource, the CAISO will uses IFM DA ahead schedule and subtracts 10% 14Slide 2

15 Proposal for use of CAISO system demand data for non-submitted meter data estimation Available CAISO System Demand Data, there are two real time values that could be used: The Actual Load is an hourly value, and comes from PI The RTM Load Forecast is a 5-Minute value that comes from the RTN system. Why use actual/forecast? To estimate incremental change between DA and RT Create simple ratio to increase DA schedules to reflect RT actual load 15Slide 2

16 Example of how CAISO Actual Load might be used to Estimate Metered Demand DA Scheduled Demand: DA Scheduled Demand / Total DA Scheduled Demand Total DA Scheduled Demand - Total Actual Load Estimated Metered Demand Default Lap PGE SCE * * Custom Lap NCPA * * Total DA Scheduled Demand: Total Actual Load: Total (DA Scheduled Demand Actual Load): Slide 2

17 Guidelines for Estimation of SC submitted measurement file or SQMD file Interval metering at each SC Metered Entities metering facility (both Load and Generation) that is polled and processed prior to T+5B would be the preferred option and would be providing actual Settlement Quality Meter Data. City gate metering, if there is a meter at the points of interconnection with the CAISO grid (or the UDCs distribution system) and adjusted for behind the meter Generation and any Load not represented by the SC. Use of EMS (SCADA) data that is available with calculations to account for any behind the data points Generation and Load that is served by some other SCs. Use of schedules, forecasts, temperature data, operating logs, recorders, some interval metering, and historic data. This is more of a practice of blending all this information to make a reasonable representation of the Load used and the Generation delivered. 17Slide 2

18 Determining accuracy for SC submitted measurement file or SQMD file SCs can test their methodology at any time to see how well they are simulating the actual Settlement Quality Meter Data. For instance, an SC can calculate its early measurement file at T+5B and compare it to its actual SQMD when available. Refinement of this process can continue. The CAISO may request the results of the SCs review and validation prior to starting payment acceleration. 18Slide 2

19 Responsibilities for compliance for SC submitted measurement file or SQMD file The SC will be responsible to the CAISO to provide the early measurement file on behalf of any load and non-caiso polled generation resources it schedules. Therefore, the SC may use any information the ESP or QF owner makes available for the calculation of the early measurement file It is the SCs responsibility to assure that the early measurement file is submitted in a timely manner and that all steps are taken to assure that the file reasonably represents the load or generation served. The CAISO will implement a late measurement file compliance program based on the enforcement protocol. The CAISO will not initially implement a charge to SCs that under report load or over report generation based on a large difference in the early measurement file and the actual SQMD file, but will leave this as a future option if it is a significant problem. 19Slide 2

20 Next Steps: Determine feasibility of bifurcation of DA Markets for Payment Acceleration this will determine need for Meter Data Estimation Stakeholders to review options presented and provide feedback to CAISO Accelerated Meter Data Submittal and Estimation Methods Estimation using DA IFM Schedules Estimation using current SAMC credit run functionality Estimation using DA IFM + Actual/Forecast SC submitted SQMD (Measurement File Guidelines) CAISO to refine options based on Stakeholder Feedback Present option at next Stakeholder Meeting Scheduled for October 7, Slide 2

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