Preliminary Feasibility Report March 2012
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PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW CHELA HYDROELECTRICPROJECT (3 X 25 MW) DISTRICT: KURUNG KUMEY ARUNACHAL PRADESH PRELIMINARY FEASIBILITY REPORT MARCH 2012 ADVETA POWER PRIVATE LIMITED 1 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW INDEX Table of Content CHAPTER Page No 1.0 EXECUTIVE SUMMARY, LOCATION AND VICINITY MAP 4 2.0 PROJECT BACKGROUND 17 3.0 PROJECT AREA 23 4.0 HYDROLOGY 25 5.0 TOPOGRAPHIC AND GEOTECHNICAL ASPECTS 29 6.0 CONCEPTUAL LAYOUT AND PLANNING 34 7.0 POWER POTENTIAL STUDIES 38 8.0 COST ESTIMATES 40 9.0 FINANCIAL ANALYSIS 46 10.0 RECOMMENDATIONS 50 Drawings and Photographs 1.0 General Layout Plan 2.0 Ground Photographs ADVETA POWER PRIVATE LIMITED 2 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW CHAPTER 1 EXECUTIVE SUMMARY ADVETA POWER PRIVATE LIMITED 3 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW CHAPTER 1 EXECUTIVE SUMMARY 1.0 INTRODUCTION Number of Hydro power Projects have been identified in Arunachal Pradesh a list of these projects is enclosed as Annexure-1.1. CHELA (KOLORIANG) HEP is one of these projects and is proposed on Kurung River in KurungKumey district of Arunachal Pradesh. The project envisages utilization of water of the Kurung River, a tributary of Subansiri River, by constructing a 28m high barrage at El ± 870 m to divert the water to water conductor system. The water will be diverted through a 8.6 km long, 5.0m diameter circular shape head race tunnel together with 400 m long 5 meter diameter steel pipe at the crossing of HRT with Panyu River to a surface power station located on the right bank of the Kurungriver at about El± 750 m. The DC office and Block development office of Koloriang Project area and Kurung basin is Koloriang. The nearest rail heads are at Harmoti-Assam and North Lakhimpur (200 Km from Koloriang), the nearest Airport/Helipadare at Lila Bari /Koloriang and the nearest sea port is in Calcutta in West Bengal. Available gross head for the project is 145 m. In order to utilize this head, the installation of 75 MW Project with Francis turbines is proposed. The project will be operated as a peaking station during lean season with diurnal storage. ADVETA POWER PRIVATE LIMITED 4 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW 1.1 PROJECT ACCESSIBILITY AND INFRASTRUCTURE The project site is well approachable from Itanagar, the state capital of Arunachal Pradesh and district head quarter of Papumpare. Project site is about384km away from Itanagar and is accessed through Koloriang. ACCESS – KOLORIANGProject has been planned as Run-of-the (ROR) Project , along the right bank of River Kurung, BRO road from Koloriang leads to Project area towards left bank of river Kurung. ROAD ROUTE DISTANCE GUWAHATI TO ITANAGAR – 415km ITANAGAR TO KOLORIANG – 380 km (HILLY) KOLORIANG (DC Office) TO PROJECT SITE –4 km NEAREST RAIL HEAD: HARMATI – 205 kmfrom the Project site NEAREST AIRPORT: LILABARI Airport is about 415 KM from the project site. HELIPAD – Available at KOLORIANG 1.2 PROJECT COMPONENTS KOLORIANGHE project envisages construction of A 28m high barrage having FRL at EL 870 m A simple surge shaft of 12m diameter ADVETA POWER PRIVATE LIMITED 5 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW Head race tunnel of 8.6 km long, 5.0 m finished diameter together with 5 meter diameter steel pipe 1 no. pressure shaft with 4 m diameter and 300 m long which at the end trifurcating into three unit Penstocks each of 3 m diameter and 15 m long near the powerhouse A surface powerhouse having an installation of three Francis turbines driven generating units of 25 MW each 1.3 HYDROLOGY Sample discharge measurements at proposed barrage site on Kurung River have been carried out by M/s ADVETA Power Private Limited. Based on these measurements, long term discharge data of nearby rivers likely 10 –daily average discharge values have been arrived. These values have been used for carrying out power potential studies. However, during preparation of Detailed Project Report measurements of water flow in the river at proposed barrage site shall be carried out covering at least two lean seasons. This data together along the data of nearby other rivers/ streams shall be used to develop long terms discharge series at proposed barrage site. 1.4 POWER POTENTIAL STUDIES As mentioned in paragraph 1.4 above, likely 10-daily average discharge values in a 90 % dependable year have been utilized for computing power potential of the Project. With an installation of 75 MW, the annual gross energy generation works out to 457.42 MU with corresponding Annual Plant Load Factor (PLF) of 69.62 % 1.5 ENVIRONMENTAL ASPECTS ADVETA POWER PRIVATE LIMITED 6 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW The predominant land use in the vicinity of the project area is forest and a portion of residential land. The proposed reservoir will not submerge any villages and the entire submergence will be inside the valley. There are no sites or monuments of archaeological or national importance or wild life sanctuaries which would be affected by the project activities directly or indirectly. 1.6 BROAD ESTIMATES OF THE COST The project is estimated to cost Rupees 543.31 crores including IDC, escalation and FM charges etc. Break-up of preliminary cost estimate of the project is given below: Particulars Amount (Rs in crores) Pre-operative Expenses 19.12 Civil Works 322.82 Electro-mechanical Works 93.50 Interest during construction (IDC) 69.42 Escalation 34.39 Financial Management Charges (FM charges) 3.80 ------------------------------------------------------------------------------------- Total cost of project 543.31 ------------------------------------------------------------------------------------------ ADVETA POWER PRIVATE LIMITED 7 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW 1.7 FINANCIAL ASPECTS As indicated above, the KOLORIANGHE project with an estimated cost of Rs. 543.31crores (including escalation, IDC, FM charges) and design energy of 444.61 MU in a 90% dependable year. The project is likely to be commissioned in next 7 years’ time including preparation of DPR, techno-economic clearance, obtaining all required clearances, developing infrastructure, appointing contractors etc. The tariff has been work out considering debt equity ratio of 70:30. 12% of energy will be given as free power to home state and 1% towards LADA. The tariff at the power house bus bars for first year has been work out to Rs 3.06 per kWh and levellised tariff as Rs2.65 per kWh. 1.8 CONCLUSION CHELA (KOLORIANG) HE project involves simple civil works and can be constructed in 4 years’ time. The project would yield design energy of 444.61 MU at the power house bus bars in a 90% dependable year. The cost per MW installed, work out to be Rs7.24crores. The preliminary feasibility report indicates that the scheme merits consideration for taking up for detailed survey, investigation and preparation of DPR and subsequently implementing the project. The Salient features of the project are given in Annexure-1.2. ADVETA POWER PRIVATE LIMITED 8 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW 1.9 LIMITATIONS OF THE STUDY AND RECOMMENDATIONS It is to be noted that the results of current study presented in this report are based on very limited information and one site visit and verification of sample elevations in the field by the topographical surveyor. Therefore, for preparation of Detailed Project Report detailed study will be required which will include collection of all available data, field survey by civil engineers, geologists, hydrologists, measurement of discharge, geological and geo-technical investigations etc. ADVETA POWER PRIVATE LIMITED 9 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW List of identified Hydro Power Projects Annexure- 1.1 Sl. No. Name of Schemes River Basin Probable Installed Capacity (in MW) 1. Siang Lower Dihang/Dibang 1700.00 2. Bharali Lift Dam-II Kameng 330.00 3. Hegio Subansiri 250.00 4. Bharali Lift Dam-I Kameng 240.00 5. Emini Dihang/Dibang 295.00 6. Amulin Dihang/Dibang 235.00 7. Agolin Dihang/Dibang 235.00 8. KapakLeyak Kameng 195.00 9. Rigong Dihang/Dibang 130.00 10. Badao Kameng 120.00 11. Pakke Kameng 120.00 12. Kurung Dam-II Subansiri 115.00 13. Seba Kameng 105.00 14. Yepin Dihang/Dibang 95.00 15. Milli Subansiri 75.00 16. Chela Subansiri 75.00 17. Par Subansiri 65.00 18. Pongging Dihang/Dibang 60.00 19. Tago-I Subansiri 55.00 20. Para Kameng 55.00 21. Sepla Kameng 46.00 22. Lachung Kameng 41.00 23. Sape Subansiri 38.00 24. Ralgam Lohil 32.00 25. Nyapin Subansiri 32.00 26. Gimiliang Lohit 31.00 27. Rebby Kameng 30.00 28. Chanda Kameng 110.00 29. TarangWarang Kameng 65.00 30. Hiya Subansiri 41.00 31. Tiding-I Lohit 31.00 32. Kimi Kameng 535.00 33. Tato-II Dihang/Dibang 360.00 34. Panchung Kameng 90.00 35. Dardu Subansiri 60.00 36. Hutong Lohit 950.00 ADVETA POWER PRIVATE LIMITED 10 MALPUR, BADDI, DIST.-SOLAN, H.P.-173205 PRELIMINARY FEASIBILITY REPORT CHELA HEP 75 MW 37. KOLORIANG Subansiri 80.00 38. Oju-II Subansiri 2580.00 39. Atunli Dihang/Dibang 175.00 40. Naba Subansiri 1290.00 41. Emra-II Dihang/Dibang 870.00 42. Noa-Dehing Lohit 75.00 43. Tammu Subansiri 55.00 44. Etalin Dihang/Dibang 3045.00 45.