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CREZ Transmission Optimization (CTO) Study Overview

CREZ Transmission Optimization (CTO) Study Overview . Dan Woodfin Director, System Planning. Designated Zones and Scenario Wind Levels. Scope of Study. Scope of 2006 CREZ Study. Scope of 2008 CTO Study. 4850 MW. ~10,000 MW. ~12,000 MW. ~25,000 MW.

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CREZ Transmission Optimization (CTO) Study Overview

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  1. CREZ Transmission Optimization (CTO) StudyOverview Dan Woodfin Director, System Planning RPG-CREZTF

  2. Designated Zones and Scenario Wind Levels RPG-CREZTF

  3. Scope of Study Scope of 2006 CREZ Study Scope of 2008 CTO Study 4850 MW ~10,000 MW ~12,000 MW ~25,000 MW Number and complexity of different transmission options increases exponentially RPG-CREZTF

  4. Study Approach • Develop a number of significantly different core concepts and test their performance • Variations on the concepts with best performance will be developed and tested • The best performing plan will be selected for the scenario Significantly-Different Plans, e.g. Scenario 2 Range of Potential Solutions RPG-CREZTF

  5. Study Approach • May use the same core concepts as bases for significantly different plans in different scenarios Scenario 2 Scenario 1 Scenario 3 • But a different core concept may provide the basis for the preferred plan for a different scenario RPG-CREZTF

  6. Concepts High-level Concepts under study include: • Incremental 345 kV transmission system for wind in west Texas • Integrated 345 kV transmission system for wind in west Texas • Reduced number of right-of-ways using higher voltage circuits (500 kV or 765 kV) • Shorter wind connections with low impedance backbone or loop • Low impedance loop circuits (around load centers and/or around wind generation zones) • HVDC circuit(s) to move power to load centers or between load centers, integrated with 345kV upgrades RPG-CREZTF

  7. Recommended Plan Optimized for each Scenario 12 GW 18 GW 25 GW 24 GW 1 2 3 4 RPG-CREZTF

  8. Staging and Expansion • Will develop a preferred plan that is optimized for each of the four scenarios • Will provide expansion path of what elements in each of these plans should be built first if that Scenario is selected (except for Scenario 1) • Use lower scenarios as basis • Will develop an expansion path from the preferred plan for the lower scenarios, so as to allow for consideration of future expandability of those plans • Using next higher scenario as basis RPG-CREZTF

  9. Staging and Expandability 12 GW 18 GW 25 GW 24 GW 1 1+ 2 2+ 2 - 3 3 - 3 - - 4 4 - 4 - - RPG-CREZTF

  10. Certainty 12 GW 18 GW 25 GW 24 GW • Collection systems, transmission from west to east, and integration into eastern portion of grid are well defined • Recommended projects fit into plan for expansion to next level • All relevant studies have been completed • Transmission owners have agreed to feasibility of connections into existing facilities • Some minor changes may be necessary as result of routing analysis 1 1+ 2 2+ 2 - 3 3 - 3 - - 4 4 - 4 - - RPG-CREZTF

  11. Some Additional Study 12 GW 18 GW 25 GW 24 GW • Collection systems and transmission from west to east are well defined • A viable, near-optimal plan for integration into eastern portion of grid has been identified • Further work and a few changes in endpoints may be necessary before finalizing integration into the eastern portion of the grid • Additional requirements to address feasibility of upgrades in east • Need to include consideration of other requirements in east 1 1+ 2 2+ 2 - 3 3 - 3 - - 4 4 - 4 - - RPG-CREZTF

  12. Flexibility 12 GW 18 GW 25 GW 24 GW • Collection systems in the west are well defined • A viable plan for transmission from west to east and integration into eastern portion of grid has been identified, based on powerflow and stability • Additional work will be needed; capacity and positioning of west to east paths may change, as well as system upgrades in the eastern portion of the grid, based on consideration of additional system requirements 1 1+ 2 2+ 2 - 3 3 - 3 - - 4 4 - 4 - - RPG-CREZTF

  13. Questions?

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