Beko-Abo Multipurpose Project Pre-Feasibility Study Summary
Project Overview
The Beko-Abo Multipurpose Project is a major infrastructure initiative in Ethiopia focusing on hydropower generation, irrigation, and other water resource management objectives. The pre-feasibility study was conducted by NORPLAN and Norconsult in association with other firms for Ethiopia's Ministry of Water and Energy.
Key Components
1. Dam Site and Type Selection
The study evaluated several dam sites along the Blue Nile (Abay River) and recommended a site near Beko-Abo Bridge based on topographical advantages.
Dam Type Options Considered:
- RCC gravity dam
- Arch dam in CVC
- Central earth core rockfill dam
- Asphaltic core rockfill dam
Cost Comparison Summary (MUSD):
| Reservoir Level | RCC Gravity | Arch Dam | Central Core Rockfill | Asphaltic Core |
|---|---|---|---|---|
| 1,080 | 812 | 799 | 1,025 | 988 |
| 1,000 | 376 | 430 | 514 | 502 |
The RCC gravity dam was recommended as the most cost-effective option.
2. Power System and Transmission
The project contemplates significant power generation (2,080 MW capacity) primarily for export to Sudan and Egypt.
Key Transmission Findings:
- 500 kV double-circuit line recommended for Ethiopia-Sudan connection
- 380 km transmission distance from Beko-Abo to Sudan
- Need for switching stations along the route for voltage control
- Connection to Ethiopian grid via 400 kV line to Debre Markos
3. Surveying and Mapping
Detailed ground surveys were conducted including:
- Establishment of 14 ground control points (GCPs)
- River cross-profile surveys at 5 dam axis locations
- Water surface profile surveys (3km upstream, 2km downstream)
- Survey of Bir River tributary
Project Structure
The complete pre-feasibility study is organized into 4 volumes:
Volume 1: Main Report
Executive summary and overview of recommended project.
Volume 2: Project Drawings
Technical drawings including civil works, mechanical/electrical equipment, transmission lines, geology, and construction schedules.
Volume 3: Supporting Documents
Detailed annexes covering:
- Hydrology and sediment transport
- Reservoir operations
- Geological mapping
- Dam engineering
- Economic analyses
Volume 4: Environmental Assessment
Initial environmental and socio-economic impact assessment.
Conclusion
The Beko-Abo Multipurpose Project represents a significant development opportunity for Ethiopia, with potential benefits for power generation, irrigation, and regional power trade. The pre-feasibility study establishes the technical and economic viability of the project, with the RCC gravity dam emerging as the preferred option based on cost-effectiveness. Further detailed studies are recommended to advance the project to the feasibility stage.