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Cross Valley Brownsville Loop Project – Status report

Cross Valley Brownsville Loop Project – Status report. Project Options. Option 1 – (Sharyland and BPUB proposal) New 345kV Loma Alta station with two (2) 345/138kV 450 MVA auto ~14 mile 345kV transmission line from existing 345kV La Palma station to new 345kV Loma Alta station

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Cross Valley Brownsville Loop Project – Status report

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  1. Cross Valley Brownsville Loop Project – Status report RPG Meeting

  2. Project Options • Option 1 – (Sharyland and BPUB proposal) • New 345kV Loma Alta station with two (2) 345/138kV 450 MVA auto • ~14 mile 345kV transmission line from existing 345kV La Palma station to new 345kV Loma Alta station • ~59 mile 345kV transmission line from new 345kV Loma Alta station to new 345kV Frontera station across the valley • Option 3 • New 345kV Loma Alta station with one 345/138kV auto • ~25 mile 345kV transmission line from existing 345kV RioHondo station to new 345kV Loma Alta station • Rebuild LaPalma-Cavazos-Military Highway with 2-795 ACSR • Rebuild LaPalma-Los Fresnos-LomaAlta with 2-795 ACSR RPG Meeting

  3. Project Options (Cont.) • Option 4 • New 345kV Loma Alta station with one 345/138kV auto • ~25 mile 345kV transmission line from existing 345kV RioHondo station to new 345kV Loma Alta station • Rebuild and convert LaPalma to Brownsville 69 kV line to a 138 kV line; Add new 138 kV substation to tie LaPalma- Brownsville and the Military Highway-Carbide138 kV lines. • Option 5 (new) • New 345kV Loma Alta station with one 345/138kV auto • ~25 mile 345kV transmission line from existing 345kV RioHondo station to new 345kV Loma Alta station • ~12 mile 138kV transmission line from LaPalma – Palo Alto RPG Meeting

  4. LRGV/Brownsville Area Transmission system Rio Hondo-Loma Alta 345 kV for Options 3, 4 & 5 LaPalma 138 kV rebuild’s Option 3 LaPalma- Palo Alto 138 kV Option 5 LaPalma 69 kV to 138 kV Option 4 RPG Meeting

  5. Base Case Model & Assumptions • 2016 5YTP summer peak case based on the 2011 SSWG Dataset B • Brownsville Area Load ~ 589 MW (including 250 MW load at Loma Alta) • Silas Ray largest combined cycle unit (train) turned off • Silas Ray oldest unit (49 years) turned off • Total generation online in Brownsville ~ 48 MW • AEPSC LRGV Project • A new 163 mile, single circuit 345kV line from Laredo Lobo to Rio Bravo to N. Edinburg • Reconductor the existing two 345 kV line in to the LRGV RPG Meeting

  6. 2016 Power Flow Results N-1 & G-1 (with the new 250 MW load) • Base Case thermal (n-0) violations in 2016 • Rio Hondo – East Rio Hondo 138 kV line (151.6%) • East Rio Hondo – Central Avenue Sub 138 kV line (140.4%) • LaPalma – Los Fresnos 138 kV line (124.6%) • LaPalma – Cavazos line 138 kV (115.3%) • Loma Alta – Los Fresnos 138 kV line ( 109.1%) • Military Highway – Cavazos 138 kV line (108.3%) • There are additional overloads under contingency • No low voltage violation (in base case or under contingency) RPG Meeting

  7. 2016 Power Flow Results N-1 & G-1 (without the new 250 MW load) • Base Case thermal (n-0) violations in 2016 • Rio Hondo – East Rio Hondo 138 kV line (108.9%) • There are additional overloads under contingency (as shown in the map) • No low voltage violation (in base case or under contingency) RPG Meeting

  8. 2016 Power Flow Results N-1-1 (without the new 250 MW load) • Prior Outage of either the Ajo-Rio Hondo 345 kV or Rio Hondo-N. Edinburg 345 KV: • The loss of the next 345 kV @ Rio Hondo would cause severe overloads on several 138 kV and 69 kV lines (cross valley lines serving Brownsville area). • Some of the major post-contingency (> 120%) N-1-1 overloads: • Weslaco Unit to Steward Road 138 kV line (158.4 %) • Weslaco Switching Station to Weslaco 138 kV line (149.7%) • Aderhold to HEC Energy Center 138 kV line (142.7%) • Heidelberg to Weslaco 138 kV line (134.0%) • Elsa to Aderhold 138 kV line (133.6%) • Burns to Heidelberg 138 kV line (126.3%) • South McAllen to Las Milpas 138 kV line (124.5%) • Wesmer to Weslaco Unit 138 kV line (120.7%) • Mitigation plan to prepare for this next contingency (under system peak conditions) would require load shed in the East Valley/Brownsville area. • Based on this study, it is estimated that under the 2016 system peak system conditions, it would require ~ 430 MW of load shed in the East Valley/Brownsville area to relieve all N-1-1 overloads. RPG Meeting

  9. Summary of Results √ - no criteria violation x – criteria violation RPG Meeting

  10. Project Options for N-1-1 Criteria Loma Alta-N. Edinburg 345 kV instead of the Loma Alta-Rio Hondo 345 kV for Options 3, 4 & 5 RPG Meeting

  11. Study status/update • Completed the studies for the N-1+G-1, N-1-1 and new 250 MW load sensitivities. • Working with TO’s to obtain cost estimates for the options. • Working on completing the draft study report. • The tentative date for the study report is end of October or first week of November. RPG Meeting

  12. Questions? March 12, 2010 RPG Meeting

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