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Solar Power Generation 2011 (Las Vegas, NV)


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Mitchell Dong presents on the benefits of storage and solar thermal applications. Uses data from Andasol I, II, and Exesol I.

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Solar Power Generation 2011 (Las Vegas, NV)

  1. 1. Solar Power Generation USA January 26 th , 2011 Benefits of Storage By: Mitchell Dong
  2. 2. <ul><ul><li>3rd largest contractor in the world </li></ul></ul><ul><ul><li>$21 Billion revenues </li></ul></ul><ul><ul><li>Vertically integrated </li></ul></ul><ul><ul><li>Wholly owned by ACS </li></ul></ul><ul><ul><li>Largest power plant engineer in Spain </li></ul></ul><ul><ul><li>Technology developer and provider </li></ul></ul><ul><ul><li>Engineering Firm </li></ul></ul><ul><ul><li>Wholly owned by ACS </li></ul></ul><ul><ul><li>Developer </li></ul></ul><ul><ul><li>EPC contractor </li></ul></ul><ul><ul><li>Equity Investor </li></ul></ul><ul><ul><li>Owner and Operator </li></ul></ul>Whole package under one roof
  3. 3. ACS Cobra Spanish trough projects with molten salt 100% owned by Cobra Andasol-I Andasol-II Extresol-I Extreso-II Manchasol-I Manchasol 1,2 Andasol 1,2,4,5,6,7 Extresol1,2,3 Commercial Operation Construction Extresol-III Manchasol-II Development Andasol-IV Andasol-V Andasol-VI Andasol-VII
  4. 4. Hualapai Valley Solar Project Mohave County, AZ
  5. 5. Overview <ul><li>Parabolic Trough </li></ul><ul><li>500MW solar field </li></ul><ul><li>2x170MW steam turbines (340MW gross) </li></ul><ul><li>8 hours molten salt storage </li></ul><ul><li>$2.5 Billion project </li></ul><ul><li>Private Land </li></ul><ul><li>Located 100 miles south of Las Vegas in Arizona </li></ul><ul><li>Wet Cooling – reclaimed water from sewage treatment plant </li></ul><ul><li>WAPA connection - No new transmission lines </li></ul>
  6. 6. So. Nevada Summer Load Profile <ul><li>Peak – Noon to ten </li></ul>Source: Utility Peak
  7. 7. <ul><li>Mismatch between PV generation and peak period </li></ul><ul><li>PV misses 4-6 hours of peak demand </li></ul><ul><li>Half of PV generation is off peak </li></ul>PV Production and Load Profile Source: Utility Peak
  8. 8. <ul><li>100% of utility peak served by CSP with storage </li></ul>CSP with Storage and Load Profile Utility Peak
  9. 9. The Violent Intermittency of Photovoltaics Source:
  10. 10. Costs of Intermittent Power <ul><li>Intermittency can cause grid instability </li></ul><ul><li>Spinning reserve needed to replace sudden drops </li></ul><ul><li>Gas turbines or engines on standby </li></ul><ul><li>Storage eliminates the high cost of spinning reserve </li></ul>
  11. 11. Relative Economics <ul><li>PV lower cost per KWh than CSP with storage </li></ul><ul><li>CSP with storage produces higher quality power </li></ul><ul><li>CSP premium price over PV justified because: </li></ul><ul><ul><li>Peak power versus off-peak </li></ul></ul><ul><ul><li>No intermittency </li></ul></ul><ul><ul><li>Avoid high cost of spinning reserve </li></ul></ul><ul><ul><li>More stable, constant production </li></ul></ul><ul><ul><li>Dispatchable, predictable, programmable </li></ul></ul>
  12. 12. CASE STUDIES: Andasol 1, 2 and Extresol 1
  13. 13. Andasol 1 & 2
  14. 14. Extresol 1, 2, & 3
  15. 15. First Plant: Andasol 1 <ul><li>First commercial power plant in the world with storage </li></ul><ul><li>50MW </li></ul><ul><li>7.5 hours storage </li></ul><ul><li>Salt Quantity: 28,000 Tons </li></ul><ul><li>Freezing Temperature: 221ºC </li></ul><ul><li>Operating Range:291ºC - 384ºC </li></ul>
  16. 16. Cobra Learning Curve *Extresol 1 does not have 12 months of operations data yet
  17. 17. Learning Curve: First 12 months *Extresol 1 does not have 12 month operations yet Andasol 1 Andasol 2 Extresol 1 <ul><li>Time to hit 100% availability </li></ul><ul><ul><li>Andasol 1 – took 12 months </li></ul></ul><ul><ul><li>Andasol 2 and Extresol 1 – took 7-8 months </li></ul></ul>Gradual improvement in monthly availability for all 3 plants
  18. 18. Learning Curve: Best 6 months <ul><li>All three operated above 95% </li></ul><ul><li>Andasol 2 operated over 100% </li></ul>*Andasol 2 in Nov was down due to problems with substation ADD DATES TO FOOTNOTES Andasol 1 Andasol 2 Extresol 1
  19. 19. Actual versus Model: Andasol 2 - MONTHLY *Results of continuous performance tests *Nov 2010 plant was down due to problem with substation <ul><li>By 4th month, plant was outperforming Model estimates consistently </li></ul><ul><li>In 5 out of 9 months, Actual production exceeded Model production </li></ul>Actual
  20. 20. Actual versus Model: Andasol 2 - HOURLY <ul><li>Peak period – hourly exceeds model by 5% </li></ul><ul><li>Less filling of salt during peak to maximize peak production </li></ul><ul><li>Demonstrates operational flexibility </li></ul>Actual Production Model Production Actual Storage Model Storage DNI <ul><li>Demonstrates partial dispatchability </li></ul><ul><li>After 6 pm, salt level exceeds model </li></ul><ul><li>No operation of auxiliary gas boiler </li></ul>July 31, 2010- Representative summer day
  21. 21. Actual versus Model: Andasol 2 - HOURLY with Gas Boiler Actual Production Model Production Actual Storage Model Storage DNI Boiler Activity Aug 25 th , 2010 – typical summer day with Gas Boiler Gas Boiler allows production throughout night <ul><li>At 11:40 am, note passing cloud: </li></ul><ul><ul><li>DNI dips 5% </li></ul></ul><ul><ul><li>But output only dips 1% </li></ul></ul><ul><ul><li>Cloud passes in 20 min. </li></ul></ul><ul><ul><li>Output dip only lasts 10 minutes </li></ul></ul><ul><li>Demonstration that storage can cut intermittency </li></ul>
  22. 22. Learning Curve Statistics <ul><li>Availability factors improving with each plant as operating experience is gained over time. </li></ul><ul><li>Actual monthly and hourly performance exceeds Model expectations </li></ul><ul><li>Demonstration of how storage can deal with intermittency </li></ul><ul><li>Demonstration of how storage can offer partial dispatchability </li></ul><ul><li>ACS Integration: Interactive feedback between operations and design </li></ul><ul><li>ACS: Vertical integration expedites learning </li></ul>
  23. 23. Benefits of Storage <ul><ul><li>Shift production from OFF peak to ON peak </li></ul></ul><ul><ul><li>Dispatchable, programmable, controllable </li></ul></ul><ul><ul><li>Reduce intermittency </li></ul></ul><ul><ul><li>Constant, stable, predictable production </li></ul></ul><ul><ul><li>Premium cost over PV is justified </li></ul></ul>Dispatchability
  24. 24. Contact: Mitchell Dong [email_address] Contact: Manuel Cortes [email_address]