LFL Analysis

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Evan Neel

Resource Adequacy

ERCOT

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Large Flexible Load Task Force

February 17, 2023

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ERCOT Public

Contents

• Winter Storm Elliot LFL Response
• Voluntary Curtailment Program Back Cast

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Winter Storm Elliot LFL Response�

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Winter Storm Elliot LFL Response

• Prior to curtailment beginning on 12/21 there was 1,530 MW of LFL consumption on the system (250 MW RRS).
• At times of peak prices, LFL consumption fell to 130 MW (75 MW RRS).
• Including RRS, the total response from LFLs was 1,475 MW (96.4%).
• Of the 20 LFLs tracked, all demonstrated a curtailment in load to some extent.
• 6 LFLs curtailed their load for the entire duration of Elliot, independent of market prices.
• The remaining 14 LFLs behaved in a manner which suggested they were responding to real-time prices.

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Voluntary Curtailment Program Back Cast�

• In response to the new Interim Voluntary Load Curtailment program, we received a request inquiring about how often this program would be called upon by ERCOT.
• Language in the market notice sent out on 12/6/22 noted that this voluntary program would be deployed “during times of low or declining PRC after Non-Spinning Reserve Service has been deployed, but before ERS has been deployed.”
• ERCOT has performed a back cast with this criteria in order to identify how often the interim service would have been called upon had it existed in 2022.

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Voluntary Curtailment Program Back Cast

• Identified 5 min intervals in 2022 which satisfied two criteria:
• All offline Non-Spin had been deployed
• System PRC was below 3,200 MW

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• It is estimated that in 2022 the Voluntary Load Curtailment program would have been called on for approximately 9 hours (~ 0.1% of the year)

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Questions?

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Questions?

Email: evan.neel@ercot.com

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