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Study of Hydropower Optimization in Sri Lanka

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Study of Hydropower Optimization in Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY CEYLON ELECTRICITY BOARD(CEB) DEMOCRATIC SOCIALIST REPUBLIC OF SRI LANKA STUDY OF HYDROPOWER OPTIMIZATION IN SRI LANKA FINAL REPORT SUMMARY FEBRUARY 2004 ELECTRIC POWER DEVELOPMENT CO., LTD. NIPPON KOEI CO., LTD. TOKYO, JAPAN The Main Dam Site (looking downstream) The Kehelgamu Oya Weir Site (looking upstream) The Powerhouse Site (looking from the right bank) The Study of Hydropower Optimization in Sri Lanka CONTENTS CONCLUSION AND RECOMMENDATION .............................................................. CR - 1 Conclusion .................................................................................................................. CR - 1 Recommendation ......................................................................................................... CR - 5 PART I GENERAL 1. INTRODUCTION .................................................................................................... 1 - 1 2. GENERAL FEATURES OF SRI LANKA ............................................................... 2 - 1 2.1 Topography ....................................................................................................... 2 - 1 2.2 Climate ............................................................................................................. 2 - 1 2.3 Government ....................................................................................................... 2 - 2 3. SOCIO-ECONOMY ................................................................................................. 3 - 1 3.1 Population ......................................................................................................... 3 - 1 3.1.1 Census Population ................................................................................ 3 - 1 3.1.2 Labor Force ......................................................................................... 3 - 1 3.1.3 Ethnic Group ....................................................................................... 3 - 1 3.2 Macro Economic Features ................................................................................. 3 - 1 3.2.1 National Accounts ................................................................................ 3 - 1 3.2.2 Government Finance ............................................................................. 3 - 2 3.2.3 External Debt and Outstanding ............................................................. 3 - 2 3.2.4 Price Indices and Exchange Rates ......................................................... 3 - 3 3.3 Projection of Socio-Economic Structures ............................................................ 3 - 3 3.3.1 National Development Plans ................................................................. 3 - 3 3.3.2 Population Projection ........................................................................... 3 - 4 4. PRESENT SITUATION OF POWER SECTOR IN SRI LANKA ......................... 4 - 1 4.1 History and Formation of Power Sector .............................................................. 4 - 1 4.2 Power Demand and Supply Balance ................................................................... 4 - 1 4.3 Electricity Generation ........................................................................................ 4 - 2 4.4 Electricity Tariff ................................................................................................ 4 - 3 4.5 Existing Power Plants ........................................................................................ 4 - 4 4.6 Introduction of Independent Power Producers (IPPs) .......................................... 4 - 6 4.7 Present Status of Transmission and Distribution Lines ........................................ 4 - 6 Draft Final Report i The Study of Hydropower Optimization in Sri Lanka 5. FORECAST OF POWER DEMAND AND POWER DEVELOPMENT PLAN ................................................. 5 - 1 5.1 Forecast of Power Demand and Supply .............................................................. 5 - 1 5.2 Power Development Plan ................................................................................... 5 - 1 6. POWER SECTOR REFORM .................................................................................. 6 - 1 6.1 Background and Objectives of Power Sector Reform .......................................... 6 - 1 6.2 Reform Plan and Its Issues ................................................................................. 6 - 1 6.3 Issues of Power Sector Reform .......................................................................... 6 - 2 6.4 Post-Reform Issues and Donor Assistance .......................................................... 6 - 3 PART II OPTIMIZATION OF HYDROPOWER IN SRI LANKA 7. METEOROLOGY AND HYDROLOGY ................................................................ 7 - 1 7.1 Topography and Climate Conditions of Study Area ............................................. 7 - 1 7.1.1 Topography in Target River System ...................................................... 7 - 1 7.1.2 Climate Conditions ............................................................................... 7 - 1 7.2 Data Collection and Analysis on Hydrology ........................................................ 7 - 1 7.3 Hydrological Data Analysis ............................................................................... 7 - 1 7.4 Estimation of Runoff Data for Effective Operation of Existing Hydropower Station ............................. 7 - 2 8. EFFICIENT OPERATION OF EXISTING HYDROPOWER STATIONS ........... 8 - 1 8.1 Long Term Operation of Reservoir Type Power Stations ..................................... 8 - 1 8.1.1 Present Operational Status of Reservoir Type Power Stations ................ 8 - 1 8.1.2 Optimization Study on Reservoir Operation .......................................... 8 - 1 8.2 Efficient Operation of Regulating Pond Type Power Stations .............................. 8 - 2 8.3 Frequency Control ............................................................................................. 8 - 3 8.3.1 Present Situation of Frequency Control ................................................. 8 - 3 8.3.2 Problems of Frequency Control ............................................................ 8 - 3 8.3.3 Improvement of Frequency Control System ........................................... 8 - 4 9. STUDY ON EXPANSION OF EXISTING HYDROPOWER STATIONS ............ 9 - 1 9.1 New Laxapana and Polpitiya Hydropower Stations ............................................ 9 - 1 9.2 Victoria Hydropower Station .............................................................................. 9 - 2 9.3 Samanalawewa Hydropower Station .................................................................. 9 - 3 Draft Final Report ii The Study of Hydropower Optimization in Sri Lanka PART III BROADLANDS HYDROPOWER PROJECT 10. HYDROLOGICAL ANALYSIS FOR BROADLANDS PROJECT ...................... 10 - 1 10.1 Low Flow Runoff Analysis ................................................................................ 10 - 1 10.2 Flood Analysis ................................................................................................... 10 - 2 10.3 Estimation of Design Sediment Yield .................................................................. 10 - 3 11. GEOLOGY AND SEISMICITY ............................................................................. 11 - 1 11.1 Geology ............................................................................................................. 11 - 1 11.1.1 Topography and Geology ...................................................................... 11 - 1 11.1.2 Physical and Mechanical Properties ...................................................... 11 - 1 11.1.3 Geo-Technical Assessment .................................................................... 11 - 2 11.1.4 Concrete Aggregates ............................................................................. 11 - 3 11.2 Seismicity .......................................................................................................... 11 - 4 12. OPTIMUM DEVELOPMENT PLAN .................................................................... 12 - 1 12.1 Broadlands Hydropower Project ......................................................................... 12 - 1 12.2 Basic Layout ..................................................................................................... 12 - 1 12.3 Comparison Study of Optimal Scale ................................................................... 12 - 2 12.4 Transmission Line Route ................................................................................... 12 - 3 13. DESIGN OF CIVIL STRUCTURES AND ELECTRO-MECHANICAL EQUIPMENT ..................................... 13 - 1 13.1 Dam and Ancillary Structures ............................................................................ 13 - 1 13.2 Waterway and Powerhouse ................................................................................ 13 - 1 13.3 Electrical and Mechanical Equipment ................................................................. 13 - 2 14. CONSTRUCTION PLAN AND CONSTRUCTION COST ESTIMATE ............. 14 - 1 14.1 Outline of Construction Works ........................................................................... 14 - 1 14.2 Construction Cost Estimate ................................................................................ 14 - 1 15. ENVIRONMENTAL IMPACT ASSESSMENT ....................................................
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