Transcript NPRR 505 Weather Sensitive ERS Loads Paul Wattles, ERCOT Staff December 2012 Background • Since 2008, Emergency Response Service (ERS) has been procured three times.

NPRR 505
Weather Sensitive ERS Loads
Paul Wattles, ERCOT Staff
December 2012
Background
• Since 2008, Emergency Response Service (ERS) has been
procured three times a year for 4-month Standard Contract
Terms
– Feb. thru May
– June thru Sept.
– Oct. thru Jan.
• ERS Resources are awarded and obligated based on a static
MW capacity offer, by Time Period
– They are expected to meet performance requirements based on
that static obligation across all hours, regardless of weather
conditions
• This has worked OK for commercial & industrial loads with DR
based on business processes unaffected by weather
• For weather-sensitive Loads, not so much
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Weather impacts on load by customer type
BUSIDRRQ
BUS (IDR not
required)
BUSIDRRQ
RES(IDR not required)
BUS
RES
Wed., Aug. 3, 2011
5:00 PM
ERCOT Load: 68,416 MW
Temperature in Dallas: 109°
Wednesday
March 9, 2011
5:15 PM
ERCOT Load: 31,262 MW
Temperature in Dallas: 64°
Residential 27.4%
(~8,500 MW)
Residential
51.2%
(~35,000 MW)
Small Commercial
25.2%
Small Commercial
28.9%
Large C&I
43.7%
3/9/2011 IE 17:15
3/9/2011 IE 17:15
Large C&I
23.7%
8/3/2011 IE 17:00
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• Customer class
breakdown is for
competitive choice
areas; percentages are
extrapolated for munis
and co-ops to achieve
region-wide estimate
• Large C&I are IDR Meter
Required (>700kW)
8/3/2011 IE 17:00
Average residential summer day load curve
July 23 to July 29, 2012
Source: Pecan Street Project Inc.
Used with permission.
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Background (continued)
• Typical weather-sensitive Load:
– Aggregation of residential premises with direct load control on the
AC units (thermostat or compressor switch)
• If this ERS Load is offered into the June-September Contract
Period, its offer must reflect the demand response it will have
available on the mildest weather day of the Contract Term
– It might have 2 MW to give on Aug. 24, but only 1 MW to give on
June 1
– It must limit its offer to 1 MW – because if deployed on June 1, it
will not be able to deliver any more than that
• The static obligation also does not allow the DR provider to add
members to its aggregation, and therefore capacity to its
obligation, over the course of the Contract Term
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NPRR Overview
• ERCOT Staff worked with DSWG stakeholders throughout 2012
to identify ways to make ERS friendlier to weather-sensitive
Loads
• NPRR 505 is the result of those discussions
• Proposed schedule (normal timeline):
– December: WMS, COPS, ROS review
– December 13: PRS consideration of NPRR language
– January: WMS, COPS, ROS further review (if requested)
– January 17: PRS consideration of Impact Analysis
– February 7: TAC consideration
– March 19: Board consideration
– April 1: Language gray-boxed into Nodal Protocols
• Gives DR providers certainty on market rules prior to summer
Contract Term
– June 1: Effective date
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NPRR main features
• Creates a new category of ERS Resource — Weather Sensitive
ERS Load — and provides for their participation in ERS under
the following conditions:
– Eligible to participate as ERS Weather Sensitive Loads only
during ERS Time Periods that correlate to peak weather
conditions (e.g., Business Hours 2 and Business Hours 3 during
the summer term)
• ERCOT may establish new Time Periods to accommodate
weekends/holidays and winter peaks
– Weather Sensitive Loads’ compensation would be based solely
on their performance during deployment events and
unannounced testing
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NPRR main features (continued)
– Because aggregations of small customer Loads may be subject
to growth and/or churn, QSEs would be allowed to adjust the
population of their aggregations on a monthly basis during an
ERS Standard Contract Term
– Accelerated payment reductions protect against overly
aggressive offers or overly aggressive projected program growth
• Continued overstatement of available DR is a Protocol violation
subject to PUCT administrative action
– Weather Sensitive Loads subject to:
• A maximum of eight deployment events of up to three hours per
event during an ERS Contract Period, plus
• Up to eight ERCOT-administered unannounced tests per ERS
Standard Contract Term
– Weather Sensitive Loads evaluated and settled separately from
the other (conventional) resources in the QSE’s portfolio
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Questions?
ON
OFF
[email protected]
512/248-6578
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