1. Panhandle Renewable Energy Zone (PREZ) Study
Preliminary Results
ERCOT System Planning
ERCOT CMWG
Preliminary Results

2. Outlines Needs and Purpose of PREZ study
Generation Interconnection in Panhandle Overview
Study Process
Preliminary Results
Observation and Discussion
Preliminary Results

3. Needs of PREZ Study 2012 Long Term System Assessment
Significant expansion of wind resources in the Panhandle under a range of future outcomes.
If the northwestern-most portion of the Panhandle CREZ system becomes over-subscribed, voltage stability limits will constrain wind power delivery to the rest of the ERCOT system.
Generation projects will exceed the CREZ design capacity for the Panhandle area (based on the CREZ Reactive Study “Initial Build” recommendations).
No near-term Panhandle transmission projects being developed post CREZ 2013.
Preliminary Results

4. Purpose of PREZ Study
To identify system constraints and upgrades to accommodate future wind generation projects.
To provide a project roadmap for both ERCOT and TSPs to accommodate additional generation resources in the study area.
List of potential system upgrade projects.
Triggers for when those projects will be recommended.
Preliminary Results

5. Wind Projects GINR Overview
Preliminary Results

6. Signed Generation Interconnection Agreements in Panhandle (3489 MW as of July, 2013)
GINR
ProjectName
County
Capacity (MW)
COD**
13INR0059
Hereford Wind
Castro
499
10/1/2013
14INR0012
Miami Wind 1 Project
Gray
401
5/1/2014
13INR0048*
Spinning Spur Wind Two
Oldham
161
6/1/2014
14INR0030a2*
Panhandle Wind
Carson
218
8/1/2014
11INR0050
Moore Wind 1
Crosby
149
8/8/2014
13INR0010a
Mariah Wind
Parmer
200
10/30/2014
14INR0023
Longhorn Energy Center
Briscoe
361
12/1/2014
13INR0005*
Conway Wind Farm
600
12/15/2014
13INR0010b
12/31/2015
12INR0029
Comanche Run Wind
Swisher
500
13INR0010c
12/31/2016
*With financial commitment
** Projected commercial operation date
Preliminary Results

7. Panhandle Grid Characteristics
Minimal/no local load
Minimal/no sync generation
11 GW wind capacity in GINR
Voltage stability and grid strength challenges
Preliminary Results

8. IA (2593 3489 MW) FIS-Complete (2450 1401 MW) FIS Study (5409 5552MW)
Initial Build (2400 MW)
Panhandle
GINR Overview
Updated March 8th, 2013, July, 2013
400
400
600
761
322
218
200
600
1100
200
500
600
361
400
149
Preliminary Results

9. Study Process Reliability Analysis Economic Analysis
Steady state and dynamic stability analysis
SSWG 2016 HWLL base case
8,946MW wind output, 36.5GW load
0 MW in Panhandle
Two scenarios
5,000 MW wind output in Panhandle
7,500 MW wind output in Panhandle
Economic Analysis
2017 UPLAN case from 2012 Five-Year Transmission Plan
Preliminary Results

10. Current Panhandle Design – 2,400 MW
Gray
Alibates
Windmill
Tule Canyon
Ogallala
Tesla
Cotton Wood
Dermott
Long Draw
Preliminary Results

11. Scenario 1 Upgrades - 5 GW PREZ
Windmill – Ogallala (1ckt, 27miles)
Windmill – Alibates (1ckt, 93miles)
Ogallala – Tule Canyon (1ckt, 47miles)
Ogallala - Long Draw(2ckt, 200 miles)
Condenser: WM (350 MVAr),
OG (350 MVAr)
Reactors: TC(150MVAr), OG(150MVAr),
LD(100MVAr)
Gray
Alibates
Windmill
Ogallala
Tule Canyon
Tesla
Cotton Wood
Dermott
Long Draw
Preliminary Results

12. Scenario 2 Upgrades - 7.5 GW PREZ: Option 1
345 kV projects
Windmill – Ogallala (1ckt, 27miles)
Windmill – Alibates (1ckt, 93miles)
Ogallala – Tule Canyon (1ckt, 47miles)
Condenser: WM , OG
345/500 kV projects
Ogallala - Long Draw (2ckts, 200 miles)
Gray-Riley(2ckts, 175 miles)
Windmill-EdithClarke (2ckts, 175 miles)
Gray
Alibates
Windmill
Ogallala
Tule Canyon
Tesla
Riley
Edith Clarke
Cotton Wood
Graham
Dermott
Long Draw
W. Shackelford
Preliminary Results

13. Study Progress In Service Signed Interconnection Agreement
Alibates-Windmill (345kV)
Windmill-Ogallala(345kV)
Ogallala-TuleCanyon(345kV)
Ogallala-LongDraw 2ckts
Synchronous Condensers and Reactors
CREZ IA
SC1
SC2
0 MW
2,400 MW
3,489 MW
5,000 MW
7,500 MW
CREZ
345/500 kV projects
Gray-Riley 2ckts
Windmill-EdithClarke 2ckts
TBD
Preliminary Results

14. Notes
PREZ study focuses on the upgrade needs to increase Panhandle export capability. Other ERCOT regions may require further studies for potential thermal and stability challenges.
The identified upgrades may be revised base on the actual implementation of wind projects in Panhandle.
The upgrades identified in this study may still require RPG review.
Preliminary Results

15. Upgrades for PREZ Panhandle West Texas** Load: 0MW
Wind: 7.5GW
SG: 0MW
West Texas**
Load: 2.9GW
Wind: 7.6GW
SG*: 2.7GW
Stability Constraint:
Voltage stability
Weak link
Low short circuit ratio
Controller challenge
Existing link
Identified Panhandle Upgrades
*Include Comanche Peak units
** not include Panhandle
Preliminary Results

16. Upgrades for West Texas wind generation
Panhandle
Load: 0MW
Wind: 7.5GW
SG: 0MW
West Texas**
Load: 2.9GW
Wind: 7.6GW
SG*: 2.7GW
ERCOT
Load Centers
Stability Constraint:
Voltage stability
Low short circuit ratio
Voltage support for transfer
Existing link
Identified Panhandle Upgrades
*Include Comanche Peak units
** not include Panhandle
Further Upgrades?
Preliminary Results

17. Study Observation – Voltage Ride Through
Weak network conditions can cause transient overvoltage
Based on the modeled wind farms in the study, 973 MW wind capacity tripped due to transient overvoltage.
More capacity can be tripped that can even lead to high voltage collapse in the entire Panhandle area if wind farms are equipped with less voltage ride through capability.
Panhandle 345kV Bus Voltage Response

18. High Voltage Ride Through (HVRT): NOGRR 124
Add HVRT base on PRC-024 (Adopted by the NERC Board of Trustees on May 9, 2013)
No change to the low voltage ride through requirement in Operating Guide 2.9.1