2.29 XE KONG 5 HYDROPOWER PROJECT

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1 2.29 XE KONG 5 HYDROPOWER PROJECT The Xe Kong 5 Hydropower Project is located in Kaleum District, Xe Kong Province on the upper reaches of the Xe Kong, immediately upstream of the proposed Xe Kong 4 Hydropower Project. An MOU was signed recently with the Italian company, Sondel, giving it and exclusive mandate to investigate the site but it is understood that this is inactive. Due to its size, location and economics, Xe Kong 5 is envisaged primarily as an export project selling to Vietnam or Thailand. The evaluated layout of the Project consists of a 250 m concrete arch dam, supplying two 200 MW Francis units in a cavern powerhouse located downstream of the dam.. The reservoir will cover an area of 70 km 2 creating a reservoir approximately 30km in length. Access requirements will involve the construction of 40 km of new roads to the project site. A 250 km transmission line would interconnect to the proposed 500 kv system at Ban Sok, enabling the Project s output to be marketed in Thailand or Vietnam. The Consultant 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; SESAMEE environmental and social impact assessment. The technical and economic characteristics of the Project are summarized in the following table. No project interactions were assumed in determining these outputs. The EVALS outputs are provided. Some environmental and social costs are accounted for in the EVALS evaluation and are reflected in the program outputs. The project s wider impacts have been assessed using SESAMEE and are internalized into the evaluations reported in Section 6 of Volume A, Main Report. Power System Development Plan August 2004 Final Report Vol C: Project Catalogue 61

2 Technical and Economic Data (Source: EVALS Output): Development: Installed Capacity Factor 1.75 Contractual status No current mandate Level of study Inventory Access Roads: New road 40 km Rehabilitation 0 km Hydrology: Name of river Se Kong Av. annual precipitation (dam site) 1,944 mm/a Ave. Reservoir Inflow m 3 /s Reservoir: Full supply level (FSL) 500 m asl Minimum operating level (MOL) 362 m asl Max storage volume (FSL) 4,780 hm 3 Active storage volume 4,690 hm 3 Maximum reservoir area (FSL) 70.0 km 2 Reservoir filling time 10.5 months Dam: Main dam type Concrete Arch Maximum height 250 m Crest length 480 m Diversion: Design discharge 4,070 m 3 /s Tunnel Diameter 12.2 m Tunnel Length 300 m Spillway: Spillway type Gated Ogee Design discharge 7,560 m 3 /s Power Station: Type Cavern Number of units 2 Turbine type Francis Turbine rated head 172 m Transmission: Line Length 110 km Voltage 220 kv Output: Installed Capacity 405 MW Guaranteed capacity (95%) Average generation Primary generation (95% firm) Secondary generation 333 MW 1,795 GWh p.a. 1,479 GWh p.a. 315 GWh p.a. Average plant factor 50 % Economic: Basic project cost (no esc. or IDC) 400 mus$ Capacity cost Average energy cost Weighted energy cost 25 1,137 US$/kW 2.8 /kwh 3.1 /kwh 25 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 62

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7 2.30 XE PIAN - XE NAMNOY HYDROPOWER PROJECT The Xe Pian - Xe Nam Noy Hydropower Project is located in Champasak and Attapeu Provinces. Due to its size, location and economics, the Xe Pian-Xe Namnoy project is envisaged primarily as an export project selling to Thailand or Vietnam through the proposed Ban Sok collector substation. A concession was awarded to a developer in the nineties and preliminary construction works were commenced but the Project did not progress and the mandate has recently been re-assigned. The layout of the Project is shown in the attached plan. The Project will exploit the hydraulic potential of a system of flows on the Bolovens Plateau within the Xe Kong catchment. The flows of the Houay Makchan, the Xe Pian and its tributary Houay Liang and of the Xe Namnoy will be impounded and diverted through a tunnel to a powerhouse at the base of the Bolavens escarpment on the Xe Kong floodplain. 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; The technical and economic characteristics of the Project are summarized in the following table. No project interactions were assumed in determining these outputs. The EVALS outputs 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 63

8 Technical and Economic Data (Source: EVALS Output): Development: Installed Capacity Factor 1.75 Contractual status Concession Level of study Feasibility Access Roads: New road 59 km Rehabilitation km Hydrology: Name of river Namnoy / Xe Pian / H. Machan Av. annual precipitation 2,609 mm/a Ave. Reservoir Inflow 24.3 m 3 /s Reservoir: Full supply level (FSL) 790 m asl Minimum operating level (MOL) 750 m asl Max storage volume (FSL) 979 hm 3 Active storage volume 919 hm 3 Maximum reservoir area (FSL) 43.5 km 2 Reservoir filling time 13.5 months Dam: Main dam type Rockfill Maximum height 80 m Crest length 1,500 m Diversion: Design discharge 714 m 3 /s Tunnel Diameter 9.4 m Tunnel Length 460 m Spillway: Spillway type Ungated Design discharge 2,370 m 3 /s Power Station: Type Surface Number of units 3 Turbine type Pelton Turbine rated head 626 m Transmission: Line Length 33 km Voltage 220 kv Output: Installed Capacity 235 MW Guaranteed capacity (95%) Average generation Primary generation (95% firm) Secondary generation 219 MW 1,090 GWh p.a. 1,083 GWh p.a. 7 GWh p.a. Average plant factor 52 % Economic: Basic project cost (no esc or IDC) 477 mus$ Capacity cost Average energy cost Weighted energy cost 26 2,347 US$/kW 5.5 /kwh 5.4 /kwh 26 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 64

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14 2.31 XE PON 3 HYDROPOWER PROJECT The Xe Pon Hydropower Project is located some 220km east of Savannakhet and 80km north-northeast of the town of Saravan Province, close to Lao's border with Vietnam. Due to its size, location and economics, Xe Pon project is envisaged primarily a domestic project close to significant point loads in the Central Grid. It is understood that a developer has ap[plied to GOL for a concession to develop the Project. The project layout optimized and evaluated under the PSDP involves a 39m high RCC gravity dam in the headwaters of the Xe Pon river, some 105km upstream of its confluence with the Xe Bang Hieng and a few kilometers downstream of a relatively wide floodplain. An area of about 30 km 2 would be inundated by the reservoir, which would be connected to a powerhouse by an 8.7 km headrace tunnel that would develop about 250 m of head. Generation flows would discharge into the Xe Pon approximately 22 km downstream of the proposed dam site. The layout of the Project is shown in the attached plan. A gravel road provides access from Salavan, via Ban Ta Oy, to Ban Achungklung, located on the left bank of the Xe Pon. The access road then continues on to Ban Meo, located on the right bank some 3km downstream of the proposed weir site. The power station would provide a strategic source of generation at an extremity of the EdL grid. It would eventually interconnect to both the Central and Southern Grids through links to the Xepon town and mine, Kengkok and Saravan. 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; The technical and economic characteristics of the Project are summarized in the following table. No project interactions were assumed in determining these outputs. The EVALS outputs 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 65

15 Technical and Economic Data (Source: EVALS Output): Development: Installed Capacity Factor 1.75 Contractual status Application for MOU Level of study Inventory Access Roads: New road 21 km Rehabilitation 5 km Hydrology: Name of river Xe Pon Av. annual precipitation (dam site) 1,944 mm/a Ave. Reservoir Inflow 17.0 m 3 /s Reservoir: Full supply level (FSL) 580 m asl Minimum operating level (MOL) 560 m asl Max storage volume (FSL) 406 hm 3 Active storage volume 361 hm 3 Maximum reservoir area (FSL) 29.5 km 2 Reservoir filling time 7.5 months Dam: Main dam type RCC Gravity Maximum height 39 m Crest length 560 m Power Station: Type Surface Number of units 3 Turbine type Francis Turbine rated head 249 m Transmission: Line Length 127 km Voltage 115 kv Output: Installed Capacity 65 MW Guaranteed capacity (95%) Average generation Primary generation (95% firm) Secondary generation 58.5 MW 301 GWh p.a. 283 GWh p.a. 18 GWh p.a. Average plant factor 52 % Economic: Basic project cost (no esc. or IDC) 120 mus$ Capacity cost Average energy cost Weighted energy cost 27 2,129 US$/kW 5.0 /kwh 5.1 /kwh 27 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 66

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