krong pa 2 hydropower PLANT Tran Thanh Lien

krong pa 2 hydropower PLANT Tran Thanh Lien, Institute of Energy, Vietnam FEASIBILITY STUDY, VIETNAM 2005 KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 1

GENERAL Krong Pa 2 hydropower is located in Krong Pa river which is one of tributaries of Ba river. The dam site is located in Dak. Rong commune, KBang district, Gia Lai province, Vietnam KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 2

MAIN OBJECTIVES Krong Pa 2 hydropower plant is to supply partly electricity to Kbang district with annual average electricity production of 24. 5 x 106 KWh The project is expected to contribute to impulse for local economic and social development KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 3

ECO-SOCIAL CONDITIONS In this area, mainly ethnic minorities of Ba Na, E De, etc live with low density. Local life is poor, local inhabitants mainly earn their livings by husbandry and exploitation of forest products. Their life will be improved (by creating jobs, processing agricultural products, etc. ) when the hydropower plant comes in. The area owns convenient access road to the site. Road No. 669 A passes through powerhouse area and is 200 m far from the powerhouse. Access road to the dams is sloped gently along the riverside and convenient for construction. The distance from powerhouse to the dams is 2. 5 km KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 4

LAYOUT OF HEADWORKS KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 5

MAIN FEATURES OF PROJECT Catchment parameters Catchment area: Annual average flow: Flood discharge P = 0. 2%: Flood discharge P = 1. 0% Flood discharge P = 5. 0% Flood discharge P = 10% KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 99 km 2 2. 71 m 3/s 1, 008 m 3/s 733 m 3/s 478 m 3/s 378 m 3/s 6

MAIN FEATURES OF PROJECT Reservoir parameters Full Supply Level, FSL: 979. 0 m Minimum Operating Level, MOL: 977. 5 m Total storage capacity: 82. 38 x 103 m 3 Active storage capacity: 61. 31 x 103 m 3 KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 7

MAIN FEATURES OF PROJECT Dam and Spillway parameters DAM • • Dam type: Crest elevation: Crest length: Max height: Concrete Gravity 985 m. a. s. l 85. 83 m 9. 52 m SPILLWAY • Sill elevation: • Spillway Design Discharge: KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 979 m. a. s. l 1, 008 m 3/s 8

MAIN FEATURES OF PROJECT Waterway parameters INTAKE • Crest elevation: • Sill elevation: • Number of intake gates: (bxh) TUNNEL • Length: • Cross section dimension (bxh): PENSTOCK • Inner Diameter: • Length: 985 m. a. s. l 975. 48 m. a. s. l 1 unit (2 x 1. 8) KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 2, 420 m 2 x 1. 8 1 m 824 m 9

CROSS SECTION OF POWER STATION KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 10

MAIN FEATURES OF PROJECT Power Station parameters Install Capacity: Firm Capacity: Number of units: Type of Turbine: Max Water Head: Design Water Head: Turbine Design Discharge: KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 5. 80 MW 0. 88 MW 2 units Francis 267. 96 m 249. 90 m 2. 80 m 3/s 11

DESIGN WORK PROGRESS Under Vietnamese standard, TCXD VN: 285 - 2002, based on the design parameters as FSL of 979 m, dam height of 9. 52, and install capacity of 5. 4 MW, the Krong Pa 2 hydropower project should be project at level III. Based on the previous studies on topographic and geological conditions at project site, two alternatives 1&2 are compared to select the best dam site. Alternatives of FSL will be either 978 m or 980 m, with daily regulation or non- regulation. Consideration for alternatives of install capacity and number of units. KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 12

Main Civil Work (1) Items 1 2 3 Unit Rock and earth excavation Volume Thousand m ^3 Rock and earth fill Thousand m ^3 275. 675 Structure Stone 2. 307 Thousand m ^3 KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 6. 334 13

Main Civil Work (2) Items Unit Volume 4 Concrete 10. 309 5 Reinforced concrete Thousand m ^3 6 Cement injection boring Thousand m ^3 0. 457 KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 0. 420 14

INTERCONNECTION Current situation of power system in K'Bang district At present, K’Bang is supplied electricity with 22 k. V network from feeder to K’Bang substation of 22 km length, AC-70 line. K’Bang substation owns three feeders of 22 k. V supplying electricity to the communes, including Dak Rong which supplied with electricity from feeder of 474 with the length of 40 km, AC-70 and AC-50 line. Currently, P max of entire district reaches 2600 k. W. KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 15

INTERCONNECTION Power system development plan up to 2020 in K'Bang district Transformer of 110/35/22 k. V- 16 MVA is planned to install in K’Bang. The transformer both supplies the district with electricity and transmits electricity from 13 MW-Ka Nak, 5. 8 MW Krong Pa 2 hydropower stations to national power grid. It will meet the district’s power demand with electricity through 22 k. V and 35 k. V power network. At Plan on Power Development of Gia Lai province period 2004 -2010 perspectives up to 2015 prepared by Institute of Energy, Pmax is forecasted to reach 3610 k. W by 2005 and 5700 k. W by 2010. KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 16

INTERCONNECTION Interconnection plan for Krong Pa 2 project From Krong Pa 2 hydropower project, the line goes along the road No. 699, passing through the communes of Dak Rong, Son Lang, So Pai, Xa Dong and K’Bang village to 110 k. V K’Bang transformer The expecting line is about 55 km, it will pass through the smoother area. Almost line is closed to the road, thus convenient for installation and operation. KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 17

ENVIRONMENTAL AND SOCIAL IMPACT ASSESSMENT Physical environment. construction of Krong. Pa 2 hydropower project will give inconsiderable impact on physical environment. Reservoir bed does not cover any industrial minerals Ecological environment Krong Pa 2 hydropower project does not give any bad impact on ecological environment and gives insignificant ones on biological diversification. As the small reservoir, the impacts on surrounding are inconsiderable Socio-economical situation Annually, Krong Pa 2 hydropower project will supply national power grid with its electricity of 24. 48 x 106 k. Wh /year, making significant contribution to socio-economic development. KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 18

CONSTRUCTION SHEDULE Krong Pa 2 hydropower project is planned to construct within 2. 5 years, 6 months among them will be spent for preparation. KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 19

TOTAL INVESTMENT CAPITAL Total investment cost (not including IDC) 100. 58 billion VND Total investment capital: 107. 55 billions VND of which: 1. Construction: 52. 72 bil. VND 2. Equipment: 31. 10 bil. VND 3. Other cost: 7. 62 bil. VND 4. Contingency: 9. 14 bil. VND KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 20

CONCLUSION Based on calculations in the Fs it may be concluded that the proposed development of Krong Pa 2 Hydropower Project would be economically viable and friendly with environment. KRONG PA 2 Hydropower Project, Feasibility Study, Vietnam 2005 21