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Demand Side Working Group Load Resource Performance Subgroup April 9, 2010

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Demand Side Working Group Load Resource Performance Subgroup April 9, 2010. Mary Anne Brelinsky EDF Trading North America. LaaR Zonal Market versus Nodal Market. LaaR Zonal Market versus Nodal Market (cont.). POTENTIAL AGENDA ITEMS FOR THE SUBGROUP:

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slide1

Demand Side Working GroupLoad Resource Performance SubgroupApril 9, 2010

Mary Anne BrelinskyEDF Trading North America

laar zonal market versus nodal market cont
LaaR Zonal Market versus Nodal Market (cont.)
  • POTENTIAL AGENDA ITEMS FOR THE SUBGROUP:
  • Produce recommendation to DSWG on whether to sponsor PRR and NPRR, or NPRR only.
  • Consider implications of proration on resource-specific RRS offers.
  • Add unannounced testing provisions for Load Resources.
  • Provide more detailed definition of a performance failure.
  • Determine appropriate penalties for LR performance failures.
  • Determine appropriate penalties for QSE performance failures.
slide4

Expected Load Resource Scheduling

A Load Resource is currently consuming 22 MWs and has a RRS schedule of 20 MWs. The Load Resource telemeters the following:

Current Load = 22 MW

RRS Schedule = 20 MW

LPC = 0 MW

LPC Limit = 0 MW

ERCOT calculated LASL = 20 MW (LPC + RRS Schedule)

Net Dependable Capability = 22 MW (Current Load – LPC)

Load Resource Limit Calculator

As depicted in Section 6.5.7.2

Of the Nodal Protocols

HSL = MPC

Increasing Consumption

Regulation Down

HASL

HASL

Normal Load

Fluctuations

Current Load

Telemetry

22 MW

Current Load

Telemetry

20 MW

LASL

LASL

Decreasing

Consumption

Decreasing

Consumption

Regulation Up

Responsive Reserve

Non Spinning Reserve

20 MW

RRS Schedule

0 MW

LSL = LPC = 0

LSL = LPC = LPC Limit

5 – 30 Minutes

5 – 30 Minutes

slide5

Expected Load Resource Event

What happens during a deployment?

A Load Resource is currently consuming 22 MWs and has a RRS schedule of 20 MWs. The Load Resource telemeters the following:

Current Load = 22 MW

RRS Schedule = 20 MW

LPC = 0 MW

LPC Limit = 0 MW

ERCOT calculated LASL = 20 MW (LPC + RRS Schedule)

Net Dependable Capability = 22 MW (Current Load – LPC)

Load Resource sheds 22 MWs in less than 10 mins.

8.1.1.4.2 (d) During periods when the Load level of a Load Resource (excluding Controllable Load Resources) has been affected by a Dispatch Instruction from ERCOT, the performance of a Load Resource in response to a Dispatch Instruction must be determined by subtracting the Load Resource’s actual Load response from its Baseline. “Baseline” capacity is calculated by measuring the average of the real power consumption for five minutes before the Dispatch Instruction if the Load level of a Load Resource had not been affected by a Dispatch Instruction from ERCOT. The actual Load response is the average of the real power consumption data being telemetered to ERCOT during the Settlement Interval indicated in the Dispatch Instruction.

The load would pass the event.

HASL

HASL

22 MW

22 MW

Current Load

Telemetry

Current Load

Telemetry

20 MW

20 MW

LASL

LASL

Decreasing

Consumption

20 MW

20 MW

RRS Schedule

RRS Schedule

0 MW

0 MW

LSL = LPC = LPC Limit

LSL = LPC = LPC Limit

Minutes

0

10 Minutes

slide6

Load Resource Failure and Remedy

What happens when a Load Resource fails to perform during a deployment?

A Load Resource is currently consuming 22 MWs and has a RRS schedule of 13 MWs. The Load Resource telemeters the following:

Current Load = 22 MW

RRS Schedule = 13 MW

LPC = 7 MW

LPC Limit = 7 MW

ERCOT calculated LASL = 20 MW (LPC + RRS Schedule)

Net Dependable Capability = 15 MW (Expected Power Consumption – LPC Limit)

Load Resource sheds 15 MWs

in 10 minutes, 7 MWs shy of the LPC of 0 MWs.

ERCOT Raises the LPC Limit by 7 MWs.

HASL

HASL

22 MW

22 MW

Current Load

Telemetry

Current Load

Telemetry

20 MW

20 MW

LASL

LASL

20 MW

13 MW

RRS Schedule

RRS Schedule

Load is at 7 MW

LSL = LPC =

LPC Limit

7 MW

0 MW

LSL = LPC =

LPC Limit

0

10 Minutes

0

10 Minutes

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