2.32 XESET 2 HYDROPOWER PROJECT

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1 2.32 XESET 2 HYDROPOWER PROJECT The Xeset 2 Hydropower Project is part of the development of the hydropower potential of the Xe Set basin in Saravan Province. It is upstream of the existing 45 MW Xeset 1 project. Xeset 2 project is to be developed by EdL primarily as a Government-owned export project with some output for the Southern Grid. The Project is to be a run-of-river facility of about 70 MW. It will include a small headpond on the upper Xe Set river at Ban Setkhot with a headrace canal and tunnel connecting to a surface powerhouse on the Xe Set river. Diversion of the Houay Tapoung supplements the generation flows for both Xeset 2 and Xeset 1. The Consultant has evaluated the Project using: Existing field data no new field data was collected; Updated hydrology (1966 to 2002 streamflow series); EVALS hydropower dimensioning and evaluation software; EVSYS module for investigating joint operation with Houay Ho. A number of interactions with other projects were evaluated including intra-basin regulation benefits and conjunctive operation with the Houay Ho Project. The results of these evaluations are presented in Section 6.7 of Volume A, Main Report. The technical and economic characteristics of the Project are summarized in the following table. The table allows for the diversion of flow from the Houay Tapong and for incremental generation at Xeset 1, but not for benefits of conjunctive operation with Houay Ho.. An EVALS output are provided. Some environmental and social costs are accounted for in the EVALS evaluation and are reflected in the program outputs. Power System Development Plan August 2004 Final Report Vol C: Project Catalogue 67

2 Technical and Economic Data (Source: EVALS Output): Development: Installed Capacity Factor 2.61 Contractual status EdL project Level of study Feasibility Access Roads: New road 5 km Rehabilitation 15 km Hydrology: Name of river Xeset Av. annual precipitation (dam site) 1,944 mm/a Ave. Reservoir Inflow 12.5 m 3 /s Reservoir: Full supply level (FSL) m asl Minimum operating level (MOL) m asl Max storage volume (FSL) 9.37 hm 3 Active storage volume 9.33 hm 3 Maximum reservoir area (FSL) 1.6 km 2 Reservoir filling time 0.5 months Dam: Main dam type Concrete Gravity Maximum height 16 m Crest length 140 m Spillway: Spillway type Ungated Ogee Design discharge 596 m 3 /s Power Station: Type Surface Number of units 3 Turbine type Francis Turbine rated head 243 m Transmission: Line Length 17 km Voltage 115 kv Output: Installed Capacity 70 MW Guaranteed capacity (95%) Average generation Primary generation (95% firm) Secondary generation 66 MW 219 GWh p.a. 58 GWh p.a. 160 GWh p.a. Average plant factor 36 % Economic: Basic project cost (no esc. or IDC) mus$ Capacity cost Average energy cost Weighted energy cost 28 1,547 US$/kW 5.3 /kwh 8.5 /kwh 28 The calculation of weighted generation cost values secondary energy at half the value of primary energy based on a definition of primary energy as energy produced with 95% firmness. Power System Development Plan August 2004 Final Report Vol C: Project Catalogue 68

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8 2.33 XESET 3 HYDROPOWER PROJECT The Xeset 3 Hydropower Project is part of the development of the hydropower potential of the Xe Set basin in Saravan Province. It is upstream of the existing Xeset 1 and proposed Xeset 2 projects. It is to be developed by EdL for the domestic and export projects. The Xeset 3 is to be a 16 MW run-of-river development at the top of the Xe Set basin. The proposed layout is shown in the attached figure and includes a small headpond on the upper Xe Set at Ban Setkhot. A 4 km culvert/canal conveys water to a surface powerhouse on the Xe Set river at its confluence with the Houay Sat. The Consultant has evaluated the Project using: Existing field data no new field data was collected; Updated hydrology (1966 to 2002 streamflow series); EVALS hydropower dimensioning and evaluation software; EVSYS module for investigating joint operation with Houay Ho. A number of interactions with other projects were evaluated including downstream intra-basin regulation benefits at Xeset 1 and Xeset 2, and conjunctive operation with the Houay Ho Project. The results of these evaluations are presented in Section 6.7 of Volume A, Main Report. The technical and economic characteristics of the Project are summarized in the following table. The table allows for incremental generation at Xeset 1 and Xeset 2. An EVALS output is provided. Some environmental and social costs are accounted for in the EVALS evaluation and are reflected in the program outputs. Power System Development Plan August 2004 Final Report Vol C: Project Catalogue 69

9 Technical and Economic Data (Source: EVALS Output): Development: Installed Capacity Factor 1.62 Contractual status EdL project Level of study Feasibility Access Roads: New road 0 km Rehabilitation 15 km Hydrology: Name of river Xeset Av. annual precipitation (dam site) mm/a Ave. Reservoir Inflow 6.7 m 3 /s Reservoir: Full supply level (FSL) 1, m asl Minimum operating level (MOL) 1, m asl Max storage volume (FSL) 4.18 hm 3 Active storage volume hm 3 Maximum reservoir area (FSL) 1.3 km 2 Reservoir filling time 0.5 months Dam: Main dam type Earthfill Maximum height 11 m Crest length 630 m Spillway: Spillway type Ungated Ogee Design discharge 322 m 3 /s Power Station: Type Surface Number of units 2 Turbine type Francis Turbine rated head 166 m Transmission: Line Length 20 km Voltage 22 kv Output: Installed Capacity 16 MW Guaranteed capacity (95%) Average generation Primary generation (95% firm) Secondary generation MW 68 GWh p.a. 13 GWh p.a. 55 GWh p.a. Average plant factor 49 % Economic: Basic project cost (no esc. or IDC) mus$ Capacity cost Average energy cost Weighted energy cost 29 1,773 US$/kW 4.5 /kwh 7.6 /kwh 29 The calculation of weighted generation cost values secondary energy at half the value of primary energy based on a definition of primary energy as energy produced with 95% firmness. Power System Development Plan August 2004 Final Report Vol C: Project Catalogue 70

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