aug 17, 2012 rpg meeting kec & mec – load addition project – ercot independent review ehsan...
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Aug 17, 2012 RPG Meeting
KEC & MEC – Load Addition Project – ERCOT Independent Review
Ehsan Ur RehmanPlanning EngineerERCOT
2 RPG Meeting Aug 17, 2012
Map – Study Area
3 Aug. 17, 2012 RPG Meeting
Base Case Model & Assumptions
Study Cases
• The 2016 Reliability Case from the 2011 5YTP
Load Changes
• Load was updated/increased in the area of concern based on STEC’s submittal
• 2016 Case with 2017 loading :- STEC load: 1686 MW
• 2016 Case with 2021 loading :- STEC load: 1929 MW
Transmission
• New Rio Bravo – Lobo 138 kV line (approx. 26 miles)
Generation Changes
• Monticello 1 & 2 (in-service)
• Sam Bertron 1 & 2 (in-service)
• Greensbayou 5 (in-service)
• All other mothballed units (turned off)
4 Aug 17, 2012 RPG Meeting
Project Options
Five different options (A-E) were studied
Upgrades common to all five options (East of Cotulla)
• Build a new Tilden – Fowlerton – Reveile 138 kV line (approx. 47 miles) on double circuit structures (on a New R.O.W) so that the circuit Rate B is at least 240 MVA
• Construct a new 138 kV substation near STEC’s 69 kV Cotulla and loop the AEP’s Dilley – Cotulla 138 kV line into it
• Add a 69/138 kV auto transformer (with reverse power relays) at Cotulla so that the Rate B is at least 150 MVA
• Add reverse power relays at Georgewest autotransformer
• Add 9.6 Mvar capacitor bank at Georgewest 69 kV substation
• Add 19.2 Mvar capacitor banks at Tilden, Fowlerton and Jardin 138 kV substation Switch
The additional upgrades required (in addition to the above common upgrades) for the Five Options (A-E) discussed in the following slides
5 Aug 17, 2012 RPG Meeting
Option A
Option A Upgrades (69 kV HUB)
• Construct a 69 kV substation on AEP’s Carrizo – Crystal City 69 kV line and loop the STEC’s Brundage – Carrizo Springs 69 kV line into it
• Upgrade the auto transformer at Asherton so that the rate B is at least 150 MVA
• Upgrade Asherton – Carrizo 69 kV line (approx. 8.3 miles) so that the circuit Rate B is at least 120 MVA
• Upgrade Dilley – Cotulla 69 kV line (approx.15.8 miles) so that the circuit Rate B is at least 120 MVA
• Add 9.6 Mvar capacitor banks at Crystal City and Bigwells and Freer 69 kV substations
• Add 14.4 Mvar cap bank at Carrizo Springs 69 kV substation
Total Cost including common upgrades :- $ 62.2 million
6 Aug 17, 2012 RPG Meeting
Option B
Option B Upgrades (Bevo 69/138 kV substation)
• Construct a 138/69 kV Bevo substation near where LCRA’s Asherton – Conocco Chittam 138 kV line crosses STEC’s Carrizo Springs – West Crystal 69 kV line. Add a (69/138 kV) 150 MVA auto at BEVO
• Upgrade the auto transformer at Asherton so that the rate B is at least 150 MVA
• Upgrade Asherton – Carrizo 69 kV line (approx. 8.3 miles) so that the circuit Rate B is at least 120 MVA
• Upgrade Dilley – Cotulla 69 kV line (approx.15.8 miles) so that the circuit Rate B is at least 120 MVA
• Add 9.6 Mvar capacitor banks at Bigwells and Freer 69 kV substations
• Add 14.4 Mvar cap bank at Carrizo Springs 69 kV substation
Total Cost including common upgrades :- $ 64.2 million
7 Aug 17, 2012 RPG Meeting
Option C
Option C Upgrades (69 kV Hub & UNION substation)
• Construct a 138/69 kV Union substation near where AEP’s West Bates – Asherton 138 kV line crosses STEC’s Carrizo Springs – Brundage 69 kV line. Add a (69/138 kV) 150 MVA auto at UNION substation
• Construct a 69 kV substation on AEP’s Carrizo – Crystal City 69 kV line and loop the STEC’s Brundage – Carrizo Springs 69 kV line into it
• Install reverse power relays at 69/138 kV Asherton auto transformer
• Add 9.6 Mvar capacitor banks at Bigwells and Freer 69 kV substations
• Add 14.4 Mvar cap bank at Carrizo Springs 69 kV substation
• Add 4.6 Mvar cap bank at Brundage 69 kV substation
Total Cost including common upgrades :- $ 57.8 million
8 Aug 17, 2012 RPG Meeting
Option D
Option D Upgrades (69 kV Hub & BiGWells auto)
• Construct a 69 kV substation on AEP’s Carrizo – Crystal City 69 kV line and loop the STEC’s Brundage – Carrizo Springs 69 kV line into it
• Add a 69/138 kV auto transformer (with reverse power relays) at BigWells so the Rate B is at least 150 MVA
• Install reverse power relays at 69/138 kV auto transformer at Asherton
• Upgrade Bigwells – Brundage 69 kV line (approx. 11.10 miles) so that the circuit Rate B is 120 MVA
• Add 9.6 Mvar capacitor banks Freer 69 kV substation
• Add 14.4 Mvar cap bank at Carrizo Springs 69 kV substation
• Add 4.6 Mvar cap bank at Brundage 69 kV substation
Total Cost including common upgrades :- $ 58.81 million
9 Aug 17, 2012 RPG Meeting
Option E
Option E Upgrades (69 kV Hub & Bevo)
• Construct a 138/69 kV Bevo substation near where LCRA’s Asherton – Conocco Chittam 138 kV line crosses STEC’s Carrizo Springs – West Crystal 69 kV line. Add a (69/138 kV) 150 MVA auto at BEVO
• Construct a 69 kV substation on AEP’s Carrizo – Crystal City 69 kV line and loop the STEC’s Brundage – Carrizo Springs 69 kV line into it
• Add 9.6 Mvar capacitor bank Freer/Hollande 69 kV substation
• Add 14.4 Mvar cap bank at Carrizo Springs 69 kV substation
• Add 4.6 Mvar cap bank at Brundage 69 kV substation
Total Cost including common upgrades :- $ 55.2 million
10 Aug 17, 2012 RPG Meeting
Cost Comparison Table
UpgradesOption A
(69 kV Hub)Option B
(Bevo)Option C
(UNION & 69 kV HUB)Option D
(Big Wells & 69 kV HUB)Option E
(Bevo & 69 kV HUB)Reverse Power Relays at GeorgeWest Auto (5688) X x x x xGeorgeWest 69 kV Cap (4.6 MVARS) X x x x xGeorgeWest 138 kV Cap (4.6 MVARS) X x x x xCaps (19.6 Mvars) at Tilden, Fowlerton and Jardin X x x x x138 kV line from Tilden - Fowlerton - Reveille on a new R.O.W X x x x xAuto (138/69) at Cotulla with reverse power relays X x x x xUpgrade Dilley - Cotulla 69 kV line (15.8 miles) X XCarrizo - Asherton 69 kV Upgrade (8.3 miles) X XAsherton Auto upgrade (150 MVA) X XReverse power relays at Asherton X XCrystal City Cap (9.6) XFreer Sub Cap X X X XCARRIZO SPRINGS CAPS (14.4) X X X X XBIGWELLS CAPS (9.6) X X X XBRUNDAGE CAP (4.6) X XBIGWELLS - BRUNDGE 69 kV UPGRADE (11.10 MILES) XREVERSE POWER RELAYS AT BIGWELLS XHOLLANDE CAP XBEVO STATION X XBIGWELLS AUTO AND LOOPING XAEP TAP STATION AND AUTO X69 kV HUB X X X XAEP TAP - 69 kV hub upgrade (3.8 miles) X
TOTAL COST ($ million) 62.2 64.2 57.8 58.81 55.2
11 RPG Meeting Jan 13, 2012
Option E Upgrades (Preferred Option)
12 Aug 17, 2012 RPG Meeting
Summary for Option E Upgrades
Option E Upgrades (69 kV Hub & Bevo)
• Build a new Tilden – Fowlerton – Reveile 138 kV line (approx. 47 miles) on double circuit structures (on a New R.OW) so that the circuit Rate B is at least 240 MVA
• Construct a new 138 kV substation near STEC’s 69 kV Cotulla and loop the AEP’s Dilley – Cotulla 138 kV line into it
• Add a 69/138 kV auto transformer (with reverse power relays) at Cotulla so that the Rate B is at least 150 MVA
• Add reverse power relays at Georgewest autotransformer
• Add 19.2 Mvar capacitor banks at Tilden, Fowlerton and Jardin 138 kV substation Switch
• Add 9.6 Mvar capacitor bank at Georgewest 69 kV substation
• Construct a 138/69 kV Bevo substation near where LCRA’s Asherton – Conocco Chittam 138 kV line crosses STEC’s Carrizo Springs – West Crystal 69 kV line. Add a (69/138 kV) 150 MVA auto at BEVO
13 Aug 17, 2012 RPG Meeting
Summary for Option E Upgrades (cont.)
• Construct a 69 kV substation on AEP’s Carrizo – Crystal City 69 kV line and loop the STEC’s Brundage – Carrizo Springs 69 kV line into it
• Add 9.6 Mvar capacitor bank Freer/Hollande 69 kV substation
• Add 14.4 Mvar cap bank at Carrizo Springs 69 kV substation
• Add 4.6 Mvar cap bank at Brundage 69 kV substation
Total Cost including common upgrades :- $ 55.2 million
14 Aug 17, 2012 RPG Meeting
ERCOT Review Summary
• The preferred option for the KEC & MEC load addition project is Option E
• Option E upgrades is the least cost option that meets the reliable criteria (n-1 & g-1+n-1) and supports future load growth
• Option E is capable of supporting additional 15 % load beyond 2021 loading in the area
• The estimated cost of Option E ($55.2 million) has changed this RPG tier from 2 to 1
• The goal is to take this projected to TAC and ERCOT BOD in September 2012
15 September 17, 2010 RPG Meeting March 12, 2010
Questions?