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Overview of Alabama Power’s Tallapoosa River Operations

Overview of Alabama Power’s Tallapoosa River Operations. Martin Dam Relicensing Informational Meeting April 1, 2008. Andy Sheppard, P.E. Project Mgr. - Hydro Optimization. What do we want to do today?. Take a brief tour of the river basin and dams Review project purposes

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Overview of Alabama Power’s Tallapoosa River Operations

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  1. Overview of Alabama Power’s Tallapoosa River Operations Martin Dam Relicensing Informational Meeting April 1, 2008 Andy Sheppard, P.E. Project Mgr. - Hydro Optimization

  2. What do we want to do today? • Take a brief tour of the river basin and dams • Review project purposes • Special operation issues • Daily operation considerations

  3. Alabama Power Company Hydroelectric Projects

  4. APCo RESERVOIR SYSTEMS Three River Basins TallapoosaWarrior Coosa Drainage3,3004,200 10,100 Reservoirs 43 6 Units 114 26 Capacity(MW)420 280 950

  5. Harris Dam

  6. Martin Dam

  7. Yates Dam

  8. Thurlow Dam

  9. Tallapoosa River Basin Average Monthly Rainfall

  10. PROJECT PURPOSES • HYDRO ELECTRIC POWER • Electric System Dynamic Benefits • Energy • FLOOD CONTROL • DROUGHT MANAGEMENT • NAVIGATION REQUIREMENTS • RECREATION, FISH AND WILDLIFE • WATER QUALITY

  11. The Reservoirs operated by APCo are different in more than just name and location, they're designed to be operated differently. APCo operates two types of reservoirs : Run-of-River and Storage Run-of-RiverStorage Tallapoosa Yates, Thurlow Harris, Martin Warrior Bankhead, Holt Smith Coosa Lay, Mitchell, Jordan/Bouldin Weiss, Henry, Logan Martin Furthermore, the dams located on the same river must be operated as a single system The operations of each dam have an impact on both upstream and downstream reservoirs

  12. Typical APCo System Load and Hydro Generation during Winter 9,000 MW 8,000 MW 7,100 MW

  13. Typical APCo System Load & Hydro Generation during Summer 11,000 MW 6,300 MW

  14. Annual Hydrogeneration

  15. Flood Control - What exactly is it and who needs it?

  16. Wadley May 2003

  17. Tallapoosa River above Horseshoe Bend May 2003

  18. Flood Control - What exactly is it and who needs it? Flood Control can be defined as reducing river stages DOWNSTREAM of a dam The people and property located downstream benefit from flood control operations Run-of-river reservoirs have limited flood control capability; they cannot provide this benefit to the public

  19. How are floods managed? Downstream flood peaks are reduced by discharging less water than is coming into the reservoir Flood control plans are based on studies of significant rainfall events. Not every flood can be completely controlled; each project has a particular amount of water that it can store After all flood storage has been used, the project becomes run-of-river

  20. How are severe droughts managed? Drought Forecasting Drought Timetable Reservoir Impacts So, how does APCo make the decisions? Using a consultation process that involves all the regulatory agencies responsible for managing flow and its impacts: How bad . . . . How long . . . . . How much

  21. License Excerpt for Martin DamFERC Project 349 • Article 12 - The FERC & Secretary of the Army have rights to dictate storage & discharge rules in the interest of navigation, protection of life, health, and property, and in the interest of the fullest practicable conservation and utilization of such waters for power purposes and for other beneficial public uses, including recreational purposes (paraphrased)

  22. Tallapoosa River Daily Reservoir Operations

  23. Automated Rain & Stream Gages RIVERRAINSTREAM TALLAPOOSA 15 6 WARRIOR15 6 COOSA 45 18

  24. JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

  25. Tallapoosa River Schematic

  26. Operational Issues Daily & Weekly Load Forecast Lake Level Forecast Rain Forecast Lake Activity Inflow Forecast Maintenance Plans Units On-line Up & Down Stream Lake Levels & Inflows Required Min. Discharges Flood Control Discharges

  27. Questions?

  28. Martin Rule Curve Evaluation • Primary objective of MIG 3 Project Operations Study Plan is to determine feasibility of winter pool change • Preliminary results of modeling complete, presented today • Investigated early implementation approach – change and evaluate “in the field” • Modeling results indicate downstream flooding issues • Solicited direction from FERC – must conduct in-depth analysis of impacts and mitigation during relicensing process through modeling and studies prior to any operational changes • Evaluation of permanent changes to winter pool will be conducted over the next 2 to 3 years and proposal included in license application in 2011 • Precedent has been set for addressing future drought conditions

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