DORDI KHOLA HYDROPOWER PROJECT. Lamjung, Nepal. Progress Report. January 2018

Transcription

1 DORDI KHOLA HYDROPOWER PROJECT Lamjung, Nepal Progress Report January Himalayan Power Partner Limited Energy Sector Research, Development & Consulting Services PO Box # 12538, Kathmandu, Nepal Tel: Fax hpphydro@gmail.comurl:

2 1 Introduction Dordi Khola Hydropower Project developed by Himalayan Power Partner Ltd. (HPPL) Kathmandu, Nepal is a Run-of-River type hydroelectric project with generating capacity of 27 MW in Lamjung. 2 Project Schedule The RCOD of the project has been fixed on 31 st August 2019 with NEA as the evacuation point, the Udipur Hub, of NEA Grid will be commissioned only by August The construction works have been scheduled to complete by December 2018 and accordingly the project commissioning target has been fixed on 22 March The contingency plan to evacuate the generated power is in process with NEA for different options. The construction schedule is depicted in figure Project Features Gross Head : m Design Discharge : m3/sec Installed Capacity : 27.0 MW Total Annual Energy : GWh Total Annual Contract Energy : GWh Dry Season Energy : GWh Wet Season Energy : GWh Power Purchase Agreement (PPA) Rate : o Dry Season Energy : 8.40/unit o Wet Season Energy : 4.80/unit Water Ways Closed Conduit/Steel pipe ( 2.65m) Headrace Tunnel ( 3.3m) Penstock Pipe ( 2.3m) Tailrace : 3237 m : 2662 m : 700 m : 330 m Powerhouse Type : Surface Turbine Type : Horiz. Francis (3x9 MW) Grid Connection Point : Udipur Hub/ Lamjung Transmission Line : 132 kv Single Circuit Length : 1.2 km Monthly Progress Report 2

3 Figure 2.1: Project Construction Schedule Monthly Progress Report 3

4 4 Progress 4.1 Financial Progress Facility agreement to provide Term Loan of amount NPR 3,170 million, 75% of total project cost NPR 4,235 million, for construction of the project and working capital of amount 99 million was concluded with Bank Consortium led by Prime Commercial Bank Ltd. on 7 November Financial progress up to January 15, 2018 (End of Paush 2074) including mobilization advance to the contractors, IDC and bank commissions is tabulated below: SN Expenditure Categories Project Cost Expenses Up to Poush 2074 Figure in NPR '000 Progress % 1 Project Development Cost/Pre-construction 102, , Engineering, Administration and 175, , Management 3 Preparatory Works 110,250 84, Civil Works 2,109, , Hydro-mechanical Works 481, , Electro-mechanical Equipment 599, , Transmission Line/Construction Power 63,741 2, Environmental Mitigation, Social Support and Land Acquisition 81,490 66, IDC, Bank Commission & Fee 511, , Total 4,235,417 1,759, HPPL has completed the process of IPO after allotting equity shares worth NPR million (30% of equity capital NPR1, 065 million) to general public including project effected area people and company employees in Shrawan The public shares of HPPL have been listed in Nepal Stock Exchange & being trading in Secondary Market. 4.2 Physical Progress Physical Progress of major construction contracts/packages and their status up to January 2017 are given in the following table: S.N. Name of Contract Contractor/Supplier Award date 1 Preparatory Works: 1.1 Service Road & Bridge Rasuwa Construction Company Pvt. Ltd. 1.2 Construction of camp & REX Prefab & Facilities Construction Pvt. Ltd. 2 Civil Works 2.1 Surface Civil Works Rasuwa Construction Company Pvt. Ltd. 2.2 Underground civil Works (Tunnel & Surge Shaft) Multi Infra Structure Development Co. Pvt. Ltd. March 28, 2014 March 17, 2015 February 03, 2015 January 29, 2015 Completion date Physical Progress % July 15, July 15, June 30, 2018 December 31, Monthly Progress Report 4

5 3 Hydro-mechanical Works 3.1 Steel procurement/supply 3.2 Fabrication & Installation 4 Electro-mechanical Works 5 Power Evacuation/ Transmission Line 132 kv 6 Environmental & Land acquisition works Jindal Steel Ltd. India Machhapuchhre Metal February and Machinery Works 03, 2015 Pvt. Ltd. Voith Hydro Pvt. Ltd. India April 10, 2015 June 30, 2018 March 15, Overall Physical Progress Up to January Up to date progress of all the surface civil construction works in respect to the components are explained below: Surface Civil Works/ Rasuwa Construction Co. The construction of civil surface works including hydro-mechanical works of the project, which includes the construction of headworks, desilting basin, water conductor pipe, penstock pipe, powerhouse, tailrace and switchyard and all related hydro-mechanical works, was awarded to MS Rasuwa Construction Company Pvt. Ltd. in February Considering the necessity of smooth coordination between civil and hydro-mechanical works, the HM works were included in contract package II along with civil works. The prime contractor Rasuwa Construction Company Pvt. Ltd. has appointed Machhapuchhre Metal and Machinery Works (3MW) as nominated subcontractor, which is doing all the hydro-mechanical works of the project. Diversion Weir, Intake and Feeder Pipe Intake structure including embedment parts, under sluice portion of diversion weir, apron slab, right bank shear wall completed. Spillway portion and left bank shear wall is under construction. The feeder pipe alignment civil works have started and installation of feeder pipes are going on. A temporary access to the desilting basin has been made across the Dordi Khola for the construction activities to the right bank of Dordi Khola. Construction works at Intake, Undersluice and spill weir Monthly Progress Report 5

6 Desilting Basin The construction of Desilting basin structure is not in the critical path and hence given less priority than other structure. However, construction of the desilting basin structure is continued even in slow pace. The base part of the structure has completed throughout the length and the structural concreting works up to the top level of slope part is almost completed. The shear walls of first block of both the bays has raised up to top design level. Construction Works at Desilting Basin Water Conductor Pipe & Penstock Pipe Alignment and Valve house The excavation of the trench for the buried WCP is being continued by the nominated subcontractor Machhapuchhre Engineering Pvt. Ltd. (MEPL), a sister company of 3MW. About 280 m of WCP has been installed till date. MEPL has also started excavation for the anchor blocks followed by concreting for the penstock pipe. Installation of WCP Earthwork at penstock and Concrete work at Penstock Anchor block Monthly Progress Report 6

7 The construction of valve house which is situated immediate after the tunnel outlet and beginning of the penstock pipe shall be started only after completion of tunneling works. Power House The powerhouse structure is situated at the left bank of Marsyangdi River. Foundation excavation, laying of earth mat and blinding concreting of powerhouse foundation is completed for all the three units. The structural concreting of the machine foundation has been raised up to EL m with first embedded E&M parts and installation of penstock pipe with reducer for the third unit. The concreting works for the units one and two have been completed up to the base level of the pockets of generators. Similarly, the concreting work at the tail pool has raised up to the design level, however, the shear wall has been raised up to level m at tail pool. The rebar placing at the machine foundation and main columns are going on for the units one and two. A new batching plant with higher capacity has been added and the pace of concrete work is significantly increasing at the powerhouse site. Powerhouse construction works Underground Civil Works/Tunnel The excavation work in the tunnel is continuing. The geology of the tunnel face from outlet is slightly improving and the tunnel advancing is going on without using steel ribs. For the initial support system pattern rock bolts and shotcrete is being adopted. Total progress achieved up to the end of January 2018 is 1150m (43%) Excavation from Inlet The rock mass condition is still not good even after crossing the major shear zone. It is supposed that the alignment from inlet is again following the shear zone. The debris with water flowing at the face of the tunnel time to time even distorting the rib supports. The advancing of the tunnel is going on with packing the face, cement grouting from the face to solidify the saturated mass and then again opening the packed face. The installation of one single piece of the rib is taking around 3-4 days. So, the progress from the inlet is very minimal. An investigation along the alignment seems to be required for the possibility of alternatives for betterness of tunnel advancement. The progress up to the end of January 2018 reached is 330m. Excavation from Outlet The rockmass encountering is highly fractured quartzite with seepage water. However, patterned rock bolts and shotcrete has been applying for the support system. The advancing of the tunnel is going on with frequently performing two blasts per day. A second nieche is required for speed Monthly Progress Report 7

8 up of the tunnel cycle. Soon second nieche will be excavated at a suitable place where geology permits. The excavation progress achieved till the end of January 2018 is 820 m. Headrace Tunnel Faces from Inlet and Outlet Hydro-Mechanical Works The hydro-mechanical works of contract package II is being conducted by the nominated subcontractor Machhapuchhre Metal and Machinery Works Pvt. Ltd. (3MW). 3MW has already installed the embedded metallic parts along with gate/stoplog frames at undersluice, Intake, Desilting Basin and Draft Tube at powerhouse. As per the progress in civil works along the water conductor pipe alignment, the installation of WCP is going on since the required pipes have sufficiently already fabricated. About 280 m WCP has been installed. The feeder pipes are also being installed. Since the progress in the civil works along the penstock pipe is taking pace, 3MW is delivering bends and penstock pipe to the site from the workshop. Soon the installation of bends at anchor blocks and penstock pipe will start. The design for the tri-furcation has been submitted by the contractor and is being reviewed. The fabrication will start soon after its approval. The penstock pipe stretches along with reducer at the powerhouse, which will be connected later with Main Inlet Valve (MIV) have been installed for unit 3 and delivered at site for unit 1&2. Installation of Penstock Reducer at Powerhouse Monthly Progress Report 8

9 Electro-Mechanical Works The electro-mechanical works including supply and installation of equipment was awarded to Voith Hydro Private Ltd. under the contract package IV. Voith has already delivered three units of generator sets, LAVT, NGT panels, EOT and HOT cranes at site. Generator transformers, MIV, turbine, PPV, Spiral Casing, switchyard equipment etc. have already been dispatched and waiting for custom clearance at the India border side. Because of the lagging in civil works progress, the equipment dispatched/ delivered are being stored at the Army yard at Udipur near the powerhouse area. As per the extended RCOD, a revised construction schedule has been prepared and sent to Voith for rescheduling of their service/installation program. MIV Inspection Generator Transformer Inspection with HPPL, VOITH and NEA officials Generator Transmission Line/Power Evacuation Grid connection agreement with Nepal Electricity Authority was concluded to evacuate the generated power in proposed Udipur Hub by 1.2 km 132 kv single circuit Transmission Line. Construction of Udipur Hub and transmission line along the Marsyangdi Corridor by NEA, is delayed and expected to be completed by 2019 subsequently RCOD has been extended up to 31 st August However, a contingency plan is under way to change grid connection point from Udipur Hub to Middle Marsyangdi Switchyard at Siudibar to ensure power evacuation, in case, the project is completed earlier, as targeted. Monthly Progress Report 9

10 5 Environmental Mitigation, Social Support and Land Acquisition o o Environmental mitigation Geo-environmental Unit in the project site has been already established to address environmental mitigation works. Bio-engineering and slope stability works are going on along water conductor/service road alignment. Bio-engineering Works Along WCP alignment o o o Social support Social support to local communities in project affected areas such as construction/ improvement of local roads, drinking water schemes, support to community schools, rural electrification etc. are going on under this heading. Land acquisition Acquisition of private land for headworks, water conductor (pipe line), penstock pipe and power house almost completed. Ownership tittle of 205 ropani land has been transferred to HPPL. Government Approval for tree falling and use of forest land Approval for tree cutting and use of forest land for construction of surge shaft was granted on April 2017 only. The process for tree cutting for surge shaft is underway. Monthly Progress Report 10