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CAPTURING THE POWER OF NATURE

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  1. Iowa Stored Energy Park APPA Engineering and Operations April 16, 2007 Sam Shepard Electricity and Air Storage Enterprises CAPTURING THE POWER OF NATURE

  2. At Night In the northwest quadrant So -- How do we move the wind ? The Wind blows mightily in Iowa

  3. Project Summary Economics Technology Support Conclusions Presentation Overview

  4. Iowa Stored Energy Park An aquifer based storage system Combustion turbine technology Bio-derived fuel compatible CAPTURING THE POWER OF NATURE

  5. Storage Generation Compression Three parts to a CAES system

  6. Two existing CAES plants use mined salt caverns ISEP will use an aquifer Similar to natural gas storage techniques Storage

  7. Compression– Separate and Replace Combustor- similar to existing Expander-similar to existing High and low pressure sections Generation- Conventional Combustion Technology

  8. Two separate combustors High and Low Pressure Investigating use of two fuels Natural gas Bio-derived fuels Generation- Fuel

  9. Use existing high efficiency equipment Proven track record – Air Separation Industry Compression

  10. Increases off-peak system load Utilizes transmission when line ratings are high Provides voltage and frequency regulation During either compression or generation So how does CAES work with Wind ?

  11. State of Iowa US DOE Iowa municipal utilities Funding to Date

  12. Assessed all candidate sites in Iowa Completed seismic testing on best 2 sites Selected best site – west of Des Moines Building ownership / off-take portfolio Preparing to drill test wells and test fluid flow Status

  13. Iowa municipals Local residents US DOE Supporters

  14. Preliminary analysis confirms feasibility Supports renewable energy needs Adaptation of proven technology Meets electric system technical/ market needs Summary

  15. Iowa Stored Energy Park“It’s The Responsible Thing To Do”Why The Economics Make Sense CAPTURING THE POWER OF NATURE

  16. Load Duration Curve 12 10 8 Demand MW 6 4 2 0 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% % Hours

  17. Comparative Cost $/MWh 90 Compression 80 Fuel + VOM Fixed Costs 70 $/MWh 60 50 40 30 20 10 0 Coal-PC CC SC CAES

  18. Cost Comparisons-Base Economics Cost Comparisons-Base Economics 250 Coal-PC Coal -IGCC 200 CC SC CAES 150 $/MWh 100 50 0 10% 15% 20% 25% 30% 35% 40% 45% 50% Capacity Factor

  19. Energy Generation 12 Diesel GT 10 CAES Demand in MW ISEP Wind 8 Coal 2 Coal 1 6 4 2 0 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% % Hours

  20. Cheapest energy 10% < C.F. < 50% Operational flexibility Enhance value of wind energy Protect against high gas prices Protect against carbon tax Why ISEP?

  21. Expander Output 103 MW Compressor Load -59 MW Gross CT output 44 MW Technology Conventional Combustion Turbine

  22. Expander Gross Output 103MW Air Flow optimization 9MW High Pressure expander 22MW CAES Gross Output 134MW CAES Machine

  23. CAES 1 kWh out = 0.75 kWh in plus 4400 Btu fuel With wind driving compression Total heat rate = 6900Btu/kWh (HHV) F Class CT Simple cycle 10000Btu/kWh (HHV) Combined cycle 7700Btu/kWh(HHV) Thermodynamics

  24. Proven source of renewable energy Control costs by owning/investing in generation source Good for the environment Mix of generation sources helps risk mitigation Consumers/owners want us to invest in renewable energy ISEP — A Great Fit For Algona

  25. Owned wind generation since 1991 Want storage from ISEP Renewable goal: 20% by 2020 Intermediate capacity needs ISEP helps Waverly meet its goals ISEP — Meeting Waverly’s Renewable Goals

  26. Increased demand anticipated Federal mandates likely Trends, challenges, and needs point to ISEP Why The Department Of Energy Backs ISEP

  27. TRENDS DIGITIZATION OF SOCIETY ECOLOGICAL CONCERN GROWTH IN ENERGY CONSUMPTION CHALLENGES POWER OUTAGES RENEWABLE MANDATES TRANSMISSION CONGESTION HIGH POWER QUALITY DISPATCHABILITY OF RENEWABLES INCREASED CAPACITY FACTOR NEEDS SOLUTION ELECTRICAL ENERGY STORAGE

  28. Iowa Stored Energy Park“It’s The Responsible Thing To Do”What Energy Customers Say… CAPTURING THE POWER OF NATURE

  29. Talked to 600 people All lived in Dallas County A strong majority support the idea We’ve Done Our Homework

  30. Helps reduce/control MY household energy costs Uses a resource (wind) not being used enough Could decrease dependency on foreign energy Could decrease dependency on fossil fuels Is a clean and healthy source of energy Why Dallas County Residents Like ISEP:

  31. Iowa Stored Energy ParkISEP Funding So Far…Leveraged $800,000 Municipal FundsReceived $3,500,000 Federal Funds CAPTURING THE POWER OF NATURE

  32. Leaving Research Phase Entering Development Phase Moving Forward Research Development Construction ending 2007 -2009 2009 - 2011

  33. ISEP Answers wind’s shortcomings Diversifies the portfolio Helps meet intermediate capacity needs Helps manage coming renewable mandates Conclusions

  34. Iowa Stored Energy ParkFor more information: Kent Holst ISEP Development Director319.239.8968 kentholst@traer.net www.isepa.com CAPTURING THE POWER OF NATURE