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Engineering Services Business Group

Engineering Services Business Group provides technical support on all aspects of hydropower development ranging from project identification studies to detailed design and construction supervision of hydroelectric projects. It has two decades of experience in design and construction supervision of hydroelectric projects with capacities up to 144 MW. The business group is headed by the General Manager. The four departments, under this business group are Project Development Department, Environment and Social Studies Department, NEA Training Center and Soil, Rock and Concrete Laboratory. The field of services offered by this business group also includes ElectroMechanical design, operation and maintenance of two concrete pole plants and a central workshop. Activities carried out by the business group during FY 2006/07 are as follows:
Project Development Department

Upper Trishuli -3A Hydroelectric Project
NEA has recently completed Detailed Project Report of Upper Trishuli—3A Hydroelectric Project with installed capacity of 60 MW. The Project is located in Rasuwa and Nuwakot districts. The headworks lies nearly 15 km north of the existing Trishuli Hydropower Station diversion weir and the powerhouse is at Simle which is about 5 km south of the proposed headworks.
Only 2 km of new road will have to be built along with the upgrading of 14 km of road between Betrawati and headworks site. NEA has carried out detailed hydrological studies at the site. The river is characterized by high firm flow as much of the discharge is fed from snow. NEA has also carried out 353 m of drilling and 3 km of seismic survey as part of the geological investigation.
The headworks comprises of a 10 m high diversion weir with 4 radial gates. It will also have a fish passage cum downstream release channel. The waterways comprises of intake channel, twin desander, 4.1 km long headrace tunnel with a diameter of 5.4 m, inclined shaft, pressure tunnel and ancillary structures. The headrace tunnel passes through quartzite and phyllite.
The underground powerhouse will have two units of Turbine generators. Power evacuation will be made through a 54 km long 220 kV transmission line connecting the Project to Matatirtha substation in Kathmandu. Annual energy generation is estimated to be 488 GWh.
Estimated cost of the Project is US$ 109 million and the Project economics study shows an EIRR of 20%. The Project is to be commissioned by 2011 if preparatory works are carried out accordingly. NEA is currently undertaking Environmental Impact Study of the Project. This Project is to be built by GoN and NEA through soft loan from Government of China.

Upper Trishuli-3B Hydroelectric Project
Upper Trishuli -3B Hydroelectric Project is the tailrace scheme of Upper Trishuli-3A. This Project will have an installed capacity of 44 MW. NEA is currently conducting feasibility study with the aim of completing the Project by FY 2011/12. This Project comprises of a 3.1 km long headrace tunnel, inclined shaft, surface powerhouse with two units and ancillary structures. Power evacuation will be made through the proposed 220 KV line of Upper Trishuli -3A. Topograhic survey and geological investigation have been carried out and layout of the structure have been accomplished. This study will be completed in the FY 2007/08. Since separate headwork and transmission line is not required, this Project can be built in a much economical manner.
Upper Seti (Damauli) Storage Project
NEA has completed Upgrading Feasibility Study of Upper Seti (Damauli) Storage Project under the technical assistance from Japanese Government through JICA. It has an installed capacity of 128 MW and will be able to generate 476 GWh of annual energy. This scheme, upon completion, will be able to provide six hours of daily peaking capacity in winter which is much valuable to the present power system. The Project will comprise of a 140 m high concrete dam, 195m long penstock, underground powerhouse and ancillary structures. Power evacuation will be made through 40 km long 220 kV line connecting the Project to the new Bharatpur substation. Estimated cost of the Project is US$ 328 million. The Project has a construction period of six years and can be commissioned by FY2014/15. Project Identification Study
In FY 2006/07, project identification studies of two projects namely Tamakoshi-V and Tila-3 were carried out.
Tamakoshi —V Hydroelectric Project with a capacity of 28 MW is located in Dolakha District approximately 170 km north-east of Kathmandu. The road connecting Singati Bazaar and Lamabagar which is being built for Upper Tamakoshi Hydropower Project (UTKHEP) passes through both powerhouse and headworks sites of Tamakoshi-V Project. This Project is conceptualized as a cascade project with UTKHEP. The headrace tunnel has a length of 2.5 km. Estimated annual generation is 158.80 GWh per year. Power evacuation from this scheme will be made through 6.0 km long 220 kV Transmission Line connected with the nearest substation at Gongar. Total project cost is estimated at US$ 45 million.
Tila-3 Hydroelectric Project is located in Kalikot District, Karnali Zone approximately 190 km North of Surkhet. It is a high head run of river project with a capacity of 116 MW. Karnali highway passes along the powerhouse and the headwork area of this Project. The headrace tunnel will be about 7.25 km long. Annual generation is estimated to be 680.20 GWh. A 144 Km long 132 kV double circuit transmission line is required to evacuate power to Kohalpur substation. Total project cost is estimated at US$ 204 million.
Other Activities
Engineering Services Business Group is also involved in providing technical support to various projects. The commercial activities carried out by Engineering Services include construction design and supervision of Chamelia HEP and detailed design of Kulekhani Ill HEP etc. This business group has also carried out detailed survey of Duhabi
—Jogbani and Butwal-Sunauli 400 kV Transmission Line. It has also completed detail survey of Kabeli Corridor 132 kVTransmission Line in FY2006/07.
In FY 2006/07, study on Kulekhani reservoir sedimentation and study on slope stabilization work of Puwa Khola HEP were also carried out. Project Development Department also operates two concrete pole plants at Kotre and Amlekhgunj. These pole manufacturing plants have greatly helped in supplying the materials required for various rural electrification projects. It also runs central workshop at Hetauda where transformer repair works are carried out.
Upper Tamakoshi Hydroelectric Project
(UTKHEP)
The detailed design of Upper Tamakoshi HEP with an installed capacity of 309 MW is being carried out in FY 2006/07. This is a peaking run-of-river type project with an annual average energy of 1,737.7 GWh. The gross head and design discharge of this Project are 820 m and 44 m3/s respectively.
Major structures of this Project comprise of a concrete dam of height 22.5 m, intake, twin desanding basins, headrace tunnel of length 7.2 km, 2.5 km long pressure shaft, underground powerhouse, 2.5 km long tailrace tunnel and 47 km long 220 kV Transmission Line.
Based on the present generating capacity and peak demand, it is estimated that in 2013 the power deficit will be 483 MW. Therefore, NEA has placed high priority to start the construction of the project by the end of 2008 so as to complete it by FY 2012/13. The Project cost is estimated at US$ 340 millions (excluding IDC and other financial costs). Its levelised unit cost is US Cent 2.6/kWh and benefit-cost ratio is 2.2. The Project will have a construction period of 4.5 years.Detailed engineering design and preparation of tender documents has been commenced from February 2007 by Norconsult-Lahmeyer International JN. The detailed design works is scheduled to be complete by November 2008. Out of 61.5 km access road, 33 km fair-weathered road from Dolakha to Singati is in operation whereas the remaining 28.5 km up to Lamabagar is under construction. Construction of three steel truss bridges along the access road will be commenced soon. Environmental Impact Assessment (E IA) report for generation has been approved by Ministry of Environment, Science and Technology (M0EST) while EIA Report for Transmission Line is under final stage of the approval. Construction of a test adit of 500 m length has been started under the Detailed Design Program. Land acquisition for 28.5 km access road is nearly completed. Two office buildings have been constructed, one each in headworks and powerhouse sites. Communication facilities have also been established in both places. In order to implement the Project by mobilizing funding from within the country, NEA is negotiating with Karmachari Sanchaya Kosh and other domestic financial institutions.
Soil, Rock and Concrete Laboratory
Soil, Rock and Concrete Laboratory has been providing quality services relating to material testing, geological and geotechnical engineering fields for hydroelectric project study.
Geological mapping, geophysical survey and core drilling are the major activities carried out by this Department. It also provides services like construction material investigation, both in-site and laboratory testing. The state of art laboratory provides services on a regular basis to NEAand other clients. The Department also carries out geotechnical design including rock support pattern for underground and surface structures.
The followings works were undertaken by the laboratory in FY 2006/07. Surface geological mapping, core drilling, geophysical survey and construction materials investigation carried out for Upper Trishuli-3B Hydrelectric Project. Additional core drilling at downstream weir option of Upper Trishuli — 3A HEP. Core drilling at option-3B powerhouse of Upper Seti (Damauli) Storage HEP. Core drilling at Middle Bhote Koshi HEP. Drilling was carried out in Sunkoshi River at three alternative dam sites of Sun Koshi Storage-Cum-Diversion Scheme in Okhaldhunga District. Topographical survey work at Upper Tamakoshi HEP. Sediment Analysis of Upper Seti (Damauli) Storage HEP
Concrete quality test at Bhiman Sub-station of Sindhuli. Concrete Mix Design and various tests on rock, soil and concrete for different private party.
 

Environmental And Social Studies Department
Environmental and Social Studies Department provide services related to all aspects of environmental studies of projects in the planning, construction and operational phase. NEA has been carrying out Environmental studies since 1987. The Environmental Unit of those days has evolved into ESSD with a wealth of experience in conducting Environmental Impact Assessment (EIA), Initial Environmental Examination (lEE), Strategic Impact Assessment (S IA) and Acquisition Compensation Rehabilitation Program (ACRP). This Department also conducts environmental monitoring and auditing of hydroelectric, transmission line and distribution line projects.
The Department accomplished the following assignments during the fiscal year 2006/07:
(a) The EIA report of Upper Tamakoshi Hydroelectric Project has been approved.
(b) The EIA report of Kawasati 132/33 kV Substation Project has already been approved.
(c) The lEE of Chandranighapur 33 kV Transmission Line Network has been approved.
(d) The updated EIA of Hetauda-Bardaghat 220 kV Transmission Line is in the final stage of approval.
(e) The Department is conducting quarterly monitoring of air, noise and water quality of Middle Marsyandhi Hydroelectric Project under construction.
(f) The EIA of Upper Trishuli-3A Hydroelectric Project (UT-3A) is being carried out.
(g) The Scoping Document and Terms of Reference of Upper Trishuli-3B Hydroelectric Project (UT-3B) is in the process of approval.
(h) The Department is in the process of awarding the EIA study of Cross-Border Butwal-Sunauli and Duhabi-Jogbani 400 kV Transmission Line to the local consultant under its supervision.
(i) The Scoping Document and Terms of Reference of Damauli-Bharatpur 220 kV Transmission Line is in the process of approval.
(j) The lEE of Dolakha-Nayapul 33 kV Transmission Line and EIA report of Gongor Khimti 220 kV Transmission Line is in the process of approval.
 

NEA Training Center
NEA Training Center (NEA-TC) has been providing need-based short term trainings to NEA employees with an aim to upgrade their professional knowledge and skills at operational and managerial levels. The training programs are designed as per training needs assessment (TNA) at organization and personnel level after discussion with the corporate executives and general managers level. Since the last two years, NEA-TC has expanded its services to include the clients outside of NEA. It has conducted various training programs to clients on their request which include Department of Electricity Development, Chilime Hydropower Co., Butwal Power Co. Ltd. and consumer community. For the first time, NEA-TC has conducted training program for foreign participants. In FY2006/07, five persons from Afganistan took part in powerhouse operation and maintenance training at Panauti Powerhouse. On the request of Small Hydropower Promotion Project of GTZ, training was imparted to the consumer community of Goplingtar lift irrigation scheme. A total of 692 staff were trained in FY 2006/07 which included 270 officers and 422 non officers. A total of 61 training programs were conducted in this period.