Transcript 2012 Five Year Plan Scope RPG Comments

2012 5YTP Scope and
Process – RPG Comments
RPG meeting
May 11, 2012
2012 5YTP Scope – RPG comments

Section 1 Five-Year Transmission Plan Goals
 1.1 Identify projects to meet needs for ERCOT Operating Guide Section 5 and NERC TPL001, TPL-002, TPL-003 and TPL-004 Reliability Standards in the years 2013, 2014 , 2015
and 2017

Section 2 Assumptions
2.1 Transmission Topology
 2.1.3 Dynamic ratings will be used for the economic portion of the analysis, but will not be
used for the reliability portion
Suggested change
 Static ratings will be used for the economic portion of the analysis as a proxy to offset the
impact of historically typical transmission unavailability associated with construction and
maintenance clearances.
New
 Transmission Interfaces will be modeled with historically typical limits (i.e. Valley Import Limit
is historically typical 1,100 MVA, West – North historical typical 2,000 MVA)
May 11, 2012
2
RPG meeting
2012 5YTP Scope – RPG comments

Section 2.2 Generation
 Wind plants will be dispatched at the SSWG base case levels for the reliability analysis
except as noted below
 Wind plants will be dispatched according to AWS Truepower profiles selected for each plant
for the economic analysis
Suggested change
 Wind Generation Resources will be dispatched as follows: Reliability Analysis: At zero MW in
the Super Zone (described in 2.3 below) being studied, and dispatched in the remaining
Super Zone at the SSWG base case levels
 Economic Analysis: Wind plants will be dispatched according to AWS Truepower profiles
selected for each plant for the economic analysis
May 11, 2012
3
RPG meeting
2012 5YTP Scope – RPG comments

Section 2.2 Generation
New
 Run a sensitivity study removing units which have a signed generation interconnection
agreement but have not provided required security and a notice to proceed.
 All existing generation plants and units with a signed generation interconnection agreement
by the start of the analysis will be used in the study with the below exceptions
Suggested change
 All future generation plants and units will be modeled in the study, if they meet the following
conditions: 1) Interconnecting Entity (IE) has notified ERCOT that it has given the
Transmission Service Provider (TSP) a financial commitment sufficient to fund the
interconnection facilities and Notice to proceed with the construction of the interconnection,
2) notified ERCOT that it has obtained all required air permits from the Texas Commission
on Environmental Quality (TCEQ), and 3) demonstrated that it has obtained the rights to
sufficient water to operate the facility (if needed).
May 11, 2012
4
RPG meeting
2012 5YTP Scope – RPG comments

Section 2.3 Load
 The load will be evaluated by weather zone. The higher of 1. the aggregated weather zone
load in the SSWG base cases or 2. the ERCOT weather zone load forecast will be used for
the reliability portion of the analysis. In addition, if there is not sufficient generation to meet
the load and reserve requirements, the base cases may be the split into multiple study
regions, defined by combinations of weather zones. For each region studied, the
corresponding weather zone demand will be set to the higher of the either the SSWG or
ERCOT econometric demand forecast. For the weather zone outside the study area the
demand will be set to the ERCOT econometric forecast.
Suggested change
 The load will be evaluated by weather zone. The studies will be performed using ERCOT’s
published 90th percentile high-temperature driven load forecasts within the group of weather
zones being studies (Super Zone), with the remaining weather zones set to ERCOT’s
econometric expected coincident peak load level. The following weather zone groupings
define each Super Zone which will be studied:
• Super Zone North: Comprised of Weather Zones NorthCentral, North, West, and
FarWest
• Super Zone South: Comprised of Weather Zones SouthCentral, South, East and C
 If there is not sufficient generation to meet the load and reserve requirements, mothballed
units will be placed in-service in the reliability analysis per the SSWG Procedure Manual
Section 4.3.3. If necessary, loads outside of the study area may be reduced until the load
and reserve requirements are met.
May 11, 2012
5
RPG meeting
2012 5YTP Scope – RPG comments

Section 3.2 Reliability Analysis
New
 As a case validation method, compare preliminary and final study findings of reliability
violations to actual facilities that experienced an insecure state lasting at least 30 minutes
during previous peak load conditions.
May 11, 2012
6
RPG meeting
2012 5YTP Scope – RPG comments
Other General:

Section 2.2 Generation
 General - Will the generation dispatch include the new responsive reserve and regulation
requirements and the non-spinning reserve requirement?
 ERCOT should consider using the average SPP of the load zone for the Wind Production
Cost instead of 0$/MWh? Wind generators on the coast would use the south load zone $,
wind generators in the west would use the west load zone $, etc… If not, ERCOT should
consider doing a sensitivity study using the average SPP of the load zone for the Wind
Production Cost?

Section 2.2 Load
 Reasonable variations in load specifically recent events in West Texas or other areas where
the future load is growing faster than the current processes can see or plan for; this could be
a check that TP for the area have an opportunity to adjust the load
May 11, 2012
7
RPG meeting
2012 5YTP Scope – RPG comments
Other General:

Section 2.4 Contingency
 Single generation unit - Will a combined cycle unit be considered a single unit?

Section 3.1 Condition the SSWG base case topology
 General - The TSPs tune the voltages in the cases created by SSWG. Who will tune the
voltages in the cases created by MOD?

Section 3.4 Economic Analysis
 General - Will ERCOT use chronic congestion experienced in 2011 as an input into the
economic analysis?
May 11, 2012
8
RPG meeting
2012 5YTP Scope
Implication of DC tie Modeling (NPRR 405)
Paragraphs 9 and 10 of Nodal Protocol Section 4.4.4

(9) DC Tie Load is considered as Load for daily and hourly reliability studies, and settled as
Adjusted Metered Load (AML). DC Tie Load is curtailed prior to other Load on the ERCOT
System due to transmission constraints as set forth in Section 6.5.9.3.4, Emergency Notice, and
during Energy Emergency Alert (EEA) events as set forth in 6.5.9.4.2, EEA Levels.

(10) DC Tie Load shall neither be curtailed during the Adjustment Period, nor for more than one
hour at a time, except for the purpose of maintaining reliability.

Should the DC ties be modeled as loads (full export) in our planning reliability studies
(5YTP) ?
May 11, 2012
9
RPG meeting
Questions?
November 14, 2008
10
Regional Planning Group