Small Hydropower Projects (SHPP) Training Workshop Project Documentation for Project Assessment. Yerevan, 12./

Transcription

1 Consulting Services for the Programme for the Promotion of Renewable Energies: German-Armenian Renewable Energy Fund (GAF-RE) Phase II, BMZ ID Small Hydropower Projects (SHPP) Training Workshop Project Documentation for Project Assessment Yerevan, 12./

2 Program Important issues as part of the project assessment Case Study GARGAR SHPP

3 Important issues as part of the project assessment Approval Registration/ Eligibility check Detailed Design pre-check Detailed Design check Project Assessment Monitoring 4 weeks 4 weeks 4 weeks 4 weeks Project Implementation Required Documents from Owners Application form, Pre-Feasibility Study, Business Plan Proof of landownership, Licence for water-use, Licence for construction, etc. Detailed Design, Land use arrangements, Cost estimate, Equipment selection / Data sheets, Implementation concept Construction/contracting arrangements, Operation and maintenance arrangements, etc. Pre-checked Detailed Design documents checked Detailed Design documents Updated Time schedule (monthly), Data sheets equipment, Progress documentation (monthly) Close contact, feedback and guidance in preparing the required documents by the Consultant

4 Important issues as part of the project assessment Reliability of Basic Design parameters, such as Topography, Geology, Hydrology Careful calculation of hydrological analysis Detailed calculation of power and energy calculations Detailed analysis of cost based on bill of quantities and unit rates Review of layout and technical design, implementation schedule, assessment of optimization of design discharge, technical risks Approval of environmental and social impact assessments Financial feasibility of the project, cashflow

5 CASE STUDY GARGAR SHPP 5

6 Case Study, Available Documentation Available Documentation The documentation made available is listed below: Topographic Survey Transport and Access Facilities Geological and Geotechnical Appraisal Geophysical Survey Seismic Refraction Geological & Geotechnical Report Seismic Hazard Analysis Hydrological analysis Sediment Transport Basic Design Final Report Analysis of Alternatives Basic design of the Plant Feasibility Study / Pre-Tender Documents Civil Design Hydromechanical Equipment Project Quantities and Costs Power and Energy Potential Project Implementation Optimization of Design Financial Analysis Environmental Impact Assessment Required documentation to allow evaluation by the Consultant. The project has to proof its technical, environmental and financial sustainability. Positive assessment is prerequisite for the loan agreement.

7 Case Study, Gargar SHPP Main Features Region: Lori Installed capacity: 3,2 MW Annual energy: 12,3 GWh Gross Head: 223,4 m Design discharge: 1,8 m³/s Intake: Tyrolean Weir Type of turbine: Pelton No. of units: 1 Penstock: app m Penstock Diam.: 1,0 m Lori Region

8 Case Study, Topography Topographic Survey The benchmarks of 4 th class triangulation of State Net served as the basis in the surveyed region. Topographic maps in 1:500 scale were surveyed for the headworks, powerhouse and appurtenant structures. The topographic maps of the waterway /penstock alignment of Gargar SHPP were drawn in the scale of 1:1000 with 5 m contour intervals. 1 m contour lines required for Detailed Design of major structures

9 Case Study, Geology Following types of engineering-geological works were performed: Engineering-geological survey of the hydropower structures sites Engineering-geological mapping in the scale 1:1000 Drilling works with total depth of 90 m; in total 6 boreholes, each 15 m deep Seismic hazard analysis was performed using the Seismic Zonation Map of Armenia. Geological map and geological-lithological section along penstock alignment of Gargar SHPP Beginning of penstock alignment Gargar River Test pits, geological mapping and seismic analysis required for Detailed Design

10 Case Study, Hydrology Hydrology was checked and approved. 45 year flow record of mean daily flows was available for analysis at the gauging station Kurtan at Gargar River. Flow Analysis Detailed flow analysis required for optimization of the SHPP. Flood Analysis Detailed flood analysis required for Detailed Design of the SHPP.

11 Case Study, Sediment Sediment Transport data was available from standard measurements of the series Grain size distribution,suspended load Amount of transported material, suspended load Grain size distribution and amount of material is required for assessment of desander facilities. Time period suspended load transport: 5 month/year

12 Case Study, Basic Design Run of river scheme Head Works constituted of a Tyrolean weir with free flow discharge. Sandtrap consisting of two chambers, 35 m long, 2 m wide 2,15 km long pressurized penstock, diameter 1,0 m. Penstock along river gorge. Embedded penstock due to potential risks caused by rock- and landslides in the gorge. Surface powerhouse The penstock feeds one Pelton turbine with four jets Layout & Design Alternative Layouts / Allignments of the Penstok were adressed and evaluated in the report.

13 Case Study, Detailed Design Headworks Fishpass Tyrolean Weir Rip Rap Flushing Penstock Desander

14 Case Study, Detailed Design Penstock / Waterway Embedded Penstock Due to seismic activity or rockfall in any case it is recommended to undertake some measures, minimizing the risk of damage. For Gagar it was recommended to embed the pipeline into a deep trench and to backfill it from the surface with a layer of silty-clay and silty-sand material with a thickness of 2.0 m.

15 Case Study, Detailed Design Powerhouse Penstock Penstock Turbine Tailrace Turbine Tailrace

16 Case Study, Hydromechanical Hydromechanical Equipment Headworks Desander Turbine Governor Auxiliary Equipment Turbine Inlet Valve Powerhouse Crane Cooling Water System Drainage and Dewatering System Air Conditioning and Ventilation Workshop and Stores Equipment etc. Dimensions of Hydroelectical equipment needs to be provided. Data sheets / quotations of the main hydromecanical components have to be submitted für assessment. If it is intended to use second-hand equipment it has to be prooved that it is overhauled and able to serve for the considered lifetime of the SHPP (30 years).

17 Case Study, Quantities and Costs Cost Estimate based on unit and lump sum prices Materials and quantities required have been computed using engineering drawings of all components of the project.

18 Case Study, Quantities and Costs Summary of Cost Estimates Physical Contingencies, Engineering and Supervision, Client s Costs and Miscelleneous Items must be specified based on the specific boundary conditions of each Project (5% - 20%).

19 Case Study, Energy Power and Energy Potential Flow Duration Curve Hydraulic Losses Generator efficiency: 98% Transformer efficiency: 99% Turbine efficiency: 88% The calculated mean monthly energy is the basis for the project optimization and the financial analysis.

20 Case Study, Optimization Optimization of Design Discharge Based on maximizing the benefit cost ratio. 1,8 m³/s

21 Case Study, Financial Analysis Financial Analysis The financial analysis provides the key parameters for the financial assessment of the SHPP. Financial Analysis

22 Case Study, Environmental Impact Assessment Environmental Impact Assessment Approach to Environmental Impact Assessment Methodology Baseline Conditions Impact Assessment Mitigation Measures Afforestation Costs Environmental Impact Assessment Land Aquisition Public Programs Institutions Environmental Monitoring Program Environmental Auditing Program The project shall not have negative social and ecological impacts.