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Nodal Regulation Service

Nodal Regulation Service. Regulation Service may be self-arranged or purchased from ERCOT In either event, Regulation Service is provided from specific Generation Resources

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Nodal Regulation Service

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  1. Nodal Regulation Service • Regulation Service may be self-arranged or purchased from ERCOT • In either event, Regulation Service is provided from specific Generation Resources • For each Generation Resource providing Regulation Service, the QSE must telemeter the Resource’s Reg-Up/Dn Responsibility and Regulation Participation Factor to ERCOT for the current hour and send the Resource’s Reg-Up/Dn Responsibility in the QSE Current Operating Plan (COP) for future hours • Each QSE providing Reg-Up/Dn has a QSE Participation Factor equal to the QSE Reg-Up/Dn Responsibility divided by the ERCOT total Reg-Up/Dn Capability • Each Generation Resource providing Reg-Up/Dn has a Unit Participation Factor equal to the Unit Reg-Up/Dn Responsibility divided by the QSE Reg-Up/Dn Responsibility (the sum of the Unit Participation Factors for each QSE equals 1.0)

  2. LFC Operation in Nodal • Every 4 secs, LFC determines the required Regulation Energy Deployment to correct the ACE • The Regulation Energy Deployment is distributed to each QSE providing Regulation Service based on the QSE Participation Factors • QSE’s distribute their Regulation Energy Deployment to each of their Resources providing Regulation Service based on the Unit Participation Factors • For settlement purposes, LFC calculates the expected energy deployment per Resource based on the telemetered Unit Participation Factors and the QSE Regulation Energy Deployment • For good frequency/control performance, individual generation Resources must follow SCED and LFC targets closely and QSE operators must send ERCOT (in a timely manner) unit parameters via ICCP that accurately represent each unit’s ability to follow their targets.

  3. PDCWG Proposal for Nodal Regulation Performance Monitoring and Qualification • The ability of each non-wind generation resource to track SCED targets and LFC Regulation energy deployments shall be monitored. A new Control Performance Error (%) for each generation resource during each SCED interval shall be calculated, summarized and reported. • A non-wind generation resource with “failed” performance during a given month shall be subject to a lower “tolerance” when calculating Base Point Deviation Charges (6.6.5.1) during the month after the next month [failure in January means a lower tolerance for that unit in March]. • An existing Zonal qualified resource shall be deemed qualified to provide an Ancillary Service in the Nodal Market • A new non-wind generation resource shall be qualified to provide an Ancillary Service in accordance with the qualification tests described in Section 8 of the Nodal Protocols.

  4. Control Performance Error Calculation • ERCOT shall compute a Control Performance Error (CPE) for each generation Resource released to SCED/LFC for each SCED interval. It will also keep track of the number of SCED Intervals in each calendar month that each Resource is released to SCED/LFC. • CPE(%)=ABS[(ATG-AERG)/(AUDG+ARI)-1.0]*100 • ATG(MW) and ARI(MW) for each SCED interval are calculated per Nodal Protocol Section 6.6.5 • AEGR(MW)=Average Estimated Governor Response = 10*GRF*HSL*(AvgFreqDev for the SCED interval) • GRF is a value provided to ERCOT by the respective QSE [usually between 0.014 and 0.033] • AUDG(MW)=Average Updated Desired Generation = the average of the ramped SCED target.

  5. Control Performance ErrorReporting • ERCOT shall prepare a monthly report summarizing the Control Performance of generation resources that have had MWH that month. • Each QSE shall receive the results for their Resources only. • For each resource, the following statistics shall be tabulated: • The percent of SCED intervals the Resource was released to SCED [based on telemetered Resource Status]. • The percent of SCED intervals the Resource was in a regulation mode [based on telemetered Resource Status]. • The percent of SCED intervals that CPE was less than 2.5% • The percent of SCED intervals that CPE was between 2.5% and 5.0% • The percent of SCED intervals that CPE was more than 5.0%

  6. Control Performance Pass/Fail Criteria • Based on the ERCOT CPS1 score for a given month, a CPE Maximum Percentage will be selected. If for 90% or more of the “released for SCED intervals” during the month, the Resource CPE was less than the CPE Maximum Percentage, the unit passes. If less than 90% it fails. ERCOT CPS1 ScoreCPE Maximum Percentage Greater than 125.0 5.0 % 110.0 – 125.0 4.5 % 100.0 – 110.0 4.0 % 90.0 – 100.0 3.5% 75.0 – 90.0 3.0% Less than 75.0 2.5 %

  7. Failed Control Performance • When a Resource fails the pass/fail test for a given month, the “tolerance” used to calculate the Base Point Deviation Charge (6.6.5.1) for that Resource shall be lowered from 5.0% to 3.5% during the month after the next month. When it passes, the tolerance will be 5.0% two months later. The extra month after the failed performance is needed to report the results and allow QSE’s to dispute the data. ILLUSTRATION Pass/Fail Pass Fail Pass Pass Pass Pass Month Jan Feb Mar April May June Tolerance 5.0% 5.0% 5.0% 3.0% 5.0% 5.0%

  8. New Resource Regulation Service Qualification Test • Reg-Up and Reg-Down qualification tests shall be conducted during continuous 60-minute periods agreed on in advance by the QSE and ERCOT. The SCED Base Point for the Resource being qualified shall be held constant during the test. • During the test, ERCOT shall send a random sequence of increasing ramp, hold, and decreasing ramp control signals to the QSE for the given Resource. The control signals may not request Resource performance beyond the HASL, LASL, and the Normal Ramp Rate defined in the RARF. • ERCOT shall maintain a duration interval, for each increasing ramp, hold, or decreasing ramp sequence, of no less than two minutes. • During at least one 10 minute duration interval selected to evaluate each of the Reg-Up and Reg-Down amounts being tested, the Control Performance Error (%) calculated by ERCOT for the 10 minute interval shall be less than 3.5%. • On successful demonstration of the above test criteria, ERCOT shall certify the Resource as capable of providing the tested Regulation Service and shall provide a copy of the certificate to the QSE and the Resource.

  9. Differences from the Luminant Proposal • The CPE measure: • Includes the effect of governor response. • Tracks the Updated Desired Generation rather than the SCED Base Point • Is calculated for each SCED Interval rather than for each Settlement Interval • The CPE is reported in histogram style rather than a monthly average. • The CPE pass/fail is based on a CPS2 style metric rather than monthly average. • Passing performance is used to restore the tolerance rather than qualification re-testing. • The CPE would not be used to disqualify a Resource from providing Ancillary Services. That would be based on criteria such as units not getting on-line within 10 minutes or a QSE not releasing RRS capacity to SCED in a timely manner. • New Resources would need to pass Qualification Testing before being allowed to provide Ancillary Services.

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