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Texas QSE To Pay $100,000 Under Settlement With PUC Staff

January 10, 2022

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Copyright 2010-21 EnergyChoiceMatters.com
Reporting by Paul Ring • ring@energychoicematters.com

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NRG Texas Power LLC (NRG) would pay $100,000 under a settlement with Staff of the Public Utility Commission of Texas to resolve alleged violations of ERCOT Nodal Protocols §§ 6.4.6, related to resource status; 6.5.5.2(7) related to operational data requirements; 6.5.7.5(2), related to Ancillary Service Capacity Monitor; and 8.1.1.3, related to ancillary service capacity compliance criteria

NRG provided the following statement concerning the matter:

"This settlement relates to errors that occurred between March 31, 2019 and June 5, 2019 in implementing rules established by ERCOT governing the provision of ancillary services. NRG has taken corrective actions to prevent further violations of ERCOT Nodal Protocols including changes to IT procedures for units with ancillary service obligations and additional training for our real-time desk operators. We’ve taken the needed corrective actions and are pleased to have reached a settlement that resolves this matter."

--- Statement from NRG

Under ERCOT Nodal Protocol § 6.4.6(1), QSEs must provide ERCOT with accurate telemetry of the current capability of each resource, including the resource status, ramp rates, high sustainable limit (HSL), and low sustainable limit (LSL). Under ERCOT Nodal Protocol § 6.5.5.2(7), a QSE providing any Regulation Service must provide telemetry indicating the appropriate status of resources providing Regulation-Up (Reg-Up) or Regulation-Down (Reg-Down), including status indicating whether the resource is temporarily blocked from receiving Reg-Up or Reg-Down deployments from the QSE. Under ERCOT Nodal Protocols § 6.5.7.5(2), each QSE must operate resources providing ancillary service capacity to meet its obligations. Under ERCOT Nodal Protocol § 8.1.1.3(3), a QSE must, within ten minutes of receiving an insufficient capacity notification from ERCOT, correct the telemetered ancillary services resource responsibility to provide sufficient capacity

The settlement states that, between March 31, 2019 and June 5, 2019, NRG failed to properly assign its ancillary service responsibilities on the following six occasions:

a. On March 31, 2019, NRG failed to assign 47 MW of Responsive Reserve Service (RRS).

b. On April 5, 2019, NRG failed to assign 19 MW of Reg-Up service.

c. On April 20, 2019, NRG failed to assign 24 MW of Reg-Up service.

d. On April 25, 2019, NRG failed to assign 35 MW of Reg-Up service.

e. On May 18, 2019, NRG failed to assign 35 MW of Reg-Up service

f. On June 5, 2019, NRG failed to properly assign 166.1 MW of RRS.

The settlement states that, between March 31, 2019 and June 5, 2019, NRG failed to telemeter the proper resource status code on the following three occasions:

a. On April 20, 2019, NRG failed to switch the resource status code for its unit WAP_G6 from ON to ONREG even though the unit was designated by NRG to provide Reg-Up service.

b. On April 25, 2019, NRG incorrectly switch the resource status code for its unit CBY_G2 from ONREG to ON even though the unit was designated by NRG to provide Reg-Up service.

c. On May 18, 2019 NRG the resource status code for its unit CBY_G2 from ONREG to ON even though the unit was designated by NRG to provide Reg-Up service.

The settlement states that NRG asserts that the instances in which it failed to properly assign its ancillary services responsibility and telemeter the correct resource status codes between March 31, 2019 and June 5, 2019 were due to the following circumstances:

a. On March 31, 2019, NRG’s unit WAP_G5 experienced operation issues requiring the unit’s shutdown; however, NRG’s operators failed to communicate during a shift change, which resulted a failure to reassign the ancillary service responsibility to a different unit.

b. On April 5, 2019, a database loading error reset NRG’s ancillary service responsibilities for NRG’s unit WAP_G6 to the previous day’s responsibilities.

c. On April 20, 2019, NRG resource WAP_G6 did not return to automatic control after valve testing which prevented the resource status code from automatically updating to reflect the unit’s ancillary service responsibility.

d. On April 25, 2019, NRG resource CBY_G2 did not return to automatic control after a mechanical issue which prevented the resource status code from automatically updating to reflect the unit’s ancillary service responsibility.

e. On May 18, 2019, NRG resource CBY_G2 did not return to automatic control after a mechanical issue which prevented the resource status code from automatically updating to reflect the unit’s ancillary service responsibility.

f. On June 5, 2019, a database loading error resulted in operational issues at several of NRG’s generating units resulted in a failure to properly assign RRS, Reg-Up service, and non-spinning reserve service.

The settlement states that, on July 10, 2020, NRG informed Commission Staff that corrective actions had been taken to prevent further violations of ERCOT Nodal Protocols and has updated its corrective actions based on current ancillary service methodology changes by ERCOT. Such corrective actions are further detailed in the settlement agreement

Docket 53058

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