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Re-Powering A Techno - Economic Analysis

Re-Powering A Techno - Economic Analysis. RENERGY / Mar 12,2012 K V Sajay. Challenges to Expansion of Wind Power. Permits & Approval. Grid & Evacuation Infrastructure. Land Availability. Poor Wind Regime. Efficiency. Low PLF. Agenda. History Opportunities Key Factors Case Study

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Re-Powering A Techno - Economic Analysis

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  1. Re-PoweringA Techno - Economic Analysis RENERGY / Mar 12,2012 K V Sajay

  2. Challenges to Expansion of Wind Power Permits & Approval Grid & Evacuation Infrastructure Land Availability Poor Wind Regime Efficiency Low PLF

  3. Agenda • History • Opportunities • Key Factors • Case Study • Benefits & Challenges • Conclusion

  4. RePowering – Inception • The history of repowering started in California with the scrapping of the first and second generation of wind turbines of the oldest plant and resale of usable plant until 1993. • Reasons mentioned were technical progress, reduction of the plant density, and restoring of the landscape near tourist routes. Germany (Feed in Tariff) • A bonus for improved grid compatibility of 0.5 cent/kWh was also introduced, and the special tariff (repowering bonus) was kept for replacing turbines that are 10 years older with new turbines, if the project doubles in rated capacity.

  5. Agenda • History • Opportunities • Key Factors • Case Study • Benefits & Challenges • Conclusion

  6. RePowering Opportunities - India Overall Wind Power Development in India • Machines are installed in • High wind regime • Class I & II Sites • Better Evacuation & Infrastructure • Low PLF Opportunity of >1000 MW can be Repowered in India 1024 MW

  7. Agenda • History • Opportunities • Key Factors • Case Study • Benefits & Challenges • Conclusion

  8. Key Factors Wind Study & Micrositing • To consider current wind data / meteorological data so as to finalize the capacity and number of new WTG could be installed/replaced Removal of existing Turbines • The removal of older running machines should be timed and planned properly to avoid any generation losses • It should not create any hindrance to nearby turbines . Installation of New Turbines • To plan the project well advance to ensure that access to roads, platforms, storage area and removal / rerouting the existing lines for moving new WTG components inside the wind farm

  9. Agenda • History • Opportunities • Key Factors • Case Study • Benefits & Challenges • Conclusion

  10. 1st RePowering Project of India in Tamil Nadu (done by Super Sales/Gamesa in 2011) After Before

  11. RePowering | Case Study (Super Sales & Fenner India) • The below table clearly depicts the generation difference between the old • and RePowered turbines Total Gen : 220.0L kWh paAverage PLF : 29.5% Total Gen : 104.4 L kWh paAverage PLF : 14.7%

  12. RePowering | Case Study Lower Electrical BoP & Grid Connection compensated by feasibility study & scrapping cost Repowering is more profitable despite same cost due to the higher PLF compared to New Projects at a Low Wind Site

  13. Agenda • History • Opportunities • Key Factors • Case Study • Benefits & Challenges • Conclusion

  14. Advantages • Better Utilization of Wind Resource [In Tamil Nadu about 60% of the small turbines ( <400KW Size) installed before year 2000 are operating with a PLF range of 10 ~ 15%.] • Higher efficiency • Better Utilization of Existing Grid Infrastructure • More wind power from the same area of land • Better power grid integration with New Turbines Technology • Reduction in green house gases possible and hence the possibility of earning more CER.

  15. Challenges (1/2) • Fresh PPAs for Repowering Projects: Repowering projects should be allowed to terminate existing PPA and avail new power sale option (PPA/REC/Captive) without loosing existing access to grid/Other conditions • Turbine Spacingin TN (5D/7D) : Change of Micro-siting norm from 5D/7D distance to 3 D/5D as in all other states • Grid Stability at old substations: Various solutions are available at turbine levels, at SCADA controls or at Sub Station levels to improve the grid stability. SMART GRIDS are also available to improve the grid stability.

  16. Challenges (2/2) • Fragmented Ownership: Limited repowering opportunity as the larger stretch of land for Repowering is not available • Logistics feasibility to move new WTG components: The presence of Wind Turbines around the Repowering site create a logistical challenge • Procedure for obtaining approval: The approval process is unclear for Repowering as agencies have little/no experience. • Disposal?

  17. Agenda • History • Opportunities • Key Factors • Case Study • Benefits & Challenges • Conclusion

  18. What we Need…RePowering Policy • Draft a clear RePowering Policy to identify & encourage RePowering • Incentives existing wind farm owners to explore RePowering, since this will provide more power without any major infrastructure addition. • Approved RePowering projects should be allowed to terminate existing PPA and avail new power sale option (PPA/REC/Captive) without loosing existing access to grid • Proactively support intercropping provided spatial requirements and wake effect requirements are met. Fast track approvals and facilitate relocation of local infrastructure (Land Allotment, electrical lines etc) due to change in micrositing • A simple NOC process • Financial and technical support to upgrade existing electrical infrastructure (if required) to accommodate larger turbines

  19. THANK YOU 19

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