The ERCOT RPG Meeting held on July 16, 2024, covered several critical project updates and evaluations. The meeting began with an antitrust admonition, setting the stage for the discussions.
The status of the CPS Eastside 345/138-kV Switching Station Project was reviewed. Initiated as a tier one project in February 2024 with an estimated cost of $158 million, the project aims to address thermal overloads on 345/138-kV transformers and transmission lines, targeting completion by June 2028. ERCOT and CPS have focused on optimal sizing and placement of capacitor banks, with a plan for 13 capacitors, mainly in the 50 MVAR block size. After evaluating several options, Option 1A emerged as the most cost-effective at $47 million, with other options being less feasible due to space constraints or higher costs. The project will be reclassified to tier three, but tier one evaluations are complete. Sensitivity analyses showed no significant impact from generation additions or load scaling.
The CPS Omicron Reliability Project was discussed, submitted to RPG in February with an estimated completion by June 2027 and a cost of approximately $42.5 million. The project addresses thermal and voltage violations at the Omicron 138 kV substation. Various options were evaluated, including a five-mile line extension and capacitor additions. Option 1b, costing $44.3 million and involving 13 capacitors, was selected for its cost-effectiveness and long-term benefits. This option was preferred for its lower cost and superior load capabilities.
The Oncor Temple Area Project, submitted in January 2024 with a tier one classification, was reviewed. Valued at $120.7 million, this project aims to resolve thermal and voltage violations in the Temple area, scheduled for service by May 2026. Various options were considered, with Option 5A emerging as the preferred choice due to its ability to meet project needs without reliability violations and minimal CCN mileages. Sensitivity analyses indicated no material impact from load scaling or generation changes. The project will be recommended to TAC in July and R&M in August, with Board approval anticipated in August.
The Brownsville Area Improvements project, submitted in March 2024, was discussed. This tier one project, estimated at $388 million, addresses thermal overloads and voltage violations. Options ranged from single circuit transmission lines to extensive 345 kV double circuit lines with auto transformers and STATCOM installations. ERCOT alternatives were examined for feasibility and cost, with several options shortlisted for further evaluation. The project is under independent review, with a final recommendation expected by Q3 2024.
The Permian Basin Reliability Plan, mandated by Texas House Bill 5066, was presented. The plan, set for final submission to the commission in July, includes local transmission upgrades and 345-kV import paths for 2030 and 2038. Dynamic stability studies support the viability of both 345-kV and 765-kV options, with 345-kV being the least expensive at approximately $13 billion. The plan addresses stakeholder concerns and aims for final recommendations by July 25th, incorporating feedback from transmission service providers and stakeholders.
The 2024 Regional Transmission Plan was reviewed, focusing on stability interface limits for the Valley region in South Texas. GTC limits for 2026 and 2029 were highlighted, with discussions on non-static hourly profiles and the methodology used. Questions about the basis for GTC limits and their relation to ongoing projects were addressed, with no final decisions made. Further inquiries are encouraged via email.
