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PRR 371 LSL clarification. Chris Ngai Market Project Group. Interim period is defined as the period between the implementation date of PRR371 and PRR359. Recap of LSL discussion at WMS on 9/17. LSL values will be collected through Addendum form from ERCOT during interim period

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Prr 371 lsl clarification

PRR 371LSL clarification

Chris Ngai

Market Project Group

ERCOT Market Operations Group


Recap of lsl discussion at wms on 9 17

Interim period is defined as the period between the implementation date of PRR371 and PRR359.

Recap of LSL discussionat WMS on 9/17

LSL values will be collected through Addendum form from ERCOT during interim period

Change of LSL is possible through NCI or updated Addendum Form

ERCOT Market Operations Group


Issue 1 29 units has no lsl values
Issue 1 implementation date of PRR371 and PRR359.:29 units has no LSL values

  • Reasons

    • tardiness

    • planning to resubmit

      • incorrect format

      • multiple values submitted

    • not planning to submit

ERCOT Market Operations Group


Proposed solution to issue 1 29 units has no lsl values
Proposed solution to Issue 1 implementation date of PRR371 and PRR359.:29 units has no LSL values

  • If ERCOT does not receive the LSL values in time for the implementation date of PRR 371

    • ERCOT will use Minimum Capacity in GARF

      • If ‘Minimum Capacity’ not exist in GARF

      • Use 3 month average LOL in RP

        • The average will be calculated once for the whole interim period

        • If 3 month average LOL in RP is not available

        • LSL = 0

ERCOT Market Operations Group


Proposed solution to issue 1 29 units has no lsl values cont d
Proposed solution to Issue 1: implementation date of PRR371 and PRR359.29 units has no LSL values, cont’d

  • The value will be used for the whole interim period until the Resource owner submit its own LSL value to ERCOT.

ERCOT Market Operations Group


Issue 2 process to change lsl values during interim period
Issue 2: implementation date of PRR371 and PRR359.Process to change LSL values during Interim Period

  • All units are allowed to change their own LSL value using the Addendum Form or NCI for future trade days

ERCOT Market Operations Group


Proposed solution to issue 2 process to change lsl values during interim period
Proposed solution to Issue 2: implementation date of PRR371 and PRR359.Process to change LSL values during Interim Period

  • The existing process of NCI will be followed

    • Effective dates of change in LSL must be a minimum of 3 days from receipt of NCI or addendum form

    • Faxing the forms in while mailing the original forms is recommended to expedite the changes in LSL

    • LSL values will not be changed for any trade day that occurs in the past

Note: The NCI form itself requires 30 days notice (unless otherwise specified in the Protocols); however, due to the nature of the information needed, a shorter timeline will be implemented.

ERCOT Market Operations Group


Issue 3 treatment of combined cycle plants
Issue 3: implementation date of PRR371 and PRR359.Treatment of Combined-Cycle Plants

  • unique characteristic of Combined-Cycle plants

    • different mode of operation

    • different LSL

  • limitation of LSL during interim period

    • constant for the entire operating day

    • needs at least 3 days in advance to change the value for the operating date

ERCOT Market Operations Group


Proposed solution to issue 3 treatment of combined cycle plants
Proposed solution to Issue 3: implementation date of PRR371 and PRR359.Treatment of Combined-Cycle Plants

  • minimum value on file

  • allows Combined-Cycle units to change LSL values used in Settlement if they can sign an affidavit that their LSL was different from the one ERCOT has on record at the time of instruction

  • sends LSL changes before Finals is recommended

  • only to the interim period

ERCOT Market Operations Group


Questions and comments

Questions implementation date of PRR371 and PRR359.and comments?

ERCOT Market Operations Group


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