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Basic Design Study Report on the Project for Improvement of Honiara Power Supply in Solomon Islands

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Basic Design Study Report on the Project for Improvement of Honiara Power Supply in Solomon Islands No. BASIC DESIGN STUDY REPORT ON THE PROJECT FOR IMPROVEMENT OF HONIARA POWER SUPPLY IN SOLOMON ISLANDS FEBRUARY 2005 JAPAN INTERNATIONAL COOPERATION AGENCY GM GRANT AID MANAGEMENT DEPARTMENT JR 05-018 PREFACE In response to a request from the Government of the Solomon Islands, the Government of Japan decided to conduct a basic design study on the Project for Improvement of Honiara Power Supply in the Solomon Islands and entrusted the study to the Japan International Cooperation Agency (JICA). JICA sent to Cambodia a study team from September 14 to October 8, 2004. The team held discussions with the officials concerned of the Government of the Solomon Islands, and conducted a field study at the study area. After the team returned to Japan, further studies were made. Then, a mission was sent to the Solomon Islands in order to discuss a draft basic design, and as this result, the present report was finalized. I hope that this report will contribute to the promotion of the project and to the enhancement of friendly relations between our two countries. I wish to express my sincere appreciation to the officials concerned of the Government of the Solomon Islands for their close cooperation extended to the teams. February, 2005 Seiji Kojima Vice-President Japan International Cooperation Agency LETTER OF TRANSMITTAL February, 2005 We are pleased to submit to you the basic design study report on the Project for Improvement of Honiara Power Supply in the Solomon Islands. This study was conducted by Yachiyo Engineering Co., Ltd., under a contract to JICA, during the period from August, 2004 to February, 2005. In conducting the study, we have examined the feasibility and rationale of the project with due consideration to the present situation of the Solomon Islands and formulated the most appropriate basic design for the project under Japan's grant aid scheme. Finally, we hope that this report will contribute to further promotion of the project. Very truly yours, Masatsugu Komiya Project Manager, Basic design study team on the Project for Improvement of Honiara Power Supply in the Solomon Islands Yachiyo Engineering Co., Ltd. LIST OF FIGURES AND TABLES CHAPTER 2 Fig. 2-2-1 Project Implementation Regime.............................................................................61 Fig. 2-2-2 Project Implementation Schedule...........................................................................66 Fig. 2-4-1 Basic Concept of Generating Unit Maintenance....................................................69 Fig. 2-4-2 Annual Operation Programme for New Generating Unit.......................................70 Fig. 2-4-3 Operating Status of Generating Units at Lungga Power Station (29th November, 2004) ..........................................................................................79 Fig. 2-4-4 Operating Mode of Generating Unit (2011)...........................................................80 Fig. 2-4-5 Operating Mode of Generating Units (2011 Without the Planned No.11 Unit) .....81 Table 2-1-1 Scoping Results......................................................................................................6 Table 2-1-2 IEE Results.............................................................................................................7 Table 2-2-3 Electrical System....................................................................................................12 Table 2-2-4 Outline of Basic Plan..............................................................................................15 Table 2-2-5 Outline Specifications of Main Equipment of New Generating Unit ....................24 Table 2-2-6 Outline of Finish of Power House Building...........................................................25 Table 2-2-7 Specifications of Step-Down Transformer .............................................................30 Table 2-2-8 Specifications of Connecting Cables at Substations ..............................................32 Table 2-2-9 Planned Contents of 33 kV Ranadi Substation.......................................................33 Table 2-2-10 Planned Contents of 33 kV Honiara East Substation .............................................34 Table 2-2-11 Planned Contents of 33 kV Honiara Switching Facilities ......................................35 Table 2-2-12 Planned Contents of 33 kV White River Substation ..............................................36 Table 2-2-13 Specifications of 33 kV Transmission Cable..........................................................37 Table 2-2-14 Procurement Quantity of 33 kV Transmission Cable.............................................37 Table 2-2-15 Scope of Work........................................................................................................57 Table 2-2-16 Supply Sources of Equipment and Materials .........................................................65 Table 2-4-1 Standard Periodical Inspection Items for Generating Unit.....................................71 Table 2-4-2 Standard Periodical Inspection Items for Transmission/Distribution/ Transforming Equipment .......................................................................................72 Table 2-4-3 Spare Parts and Maintenance Tools to be Procured Under the Project ..................74 Table 2-4-4 Historical Changes of Electricity Tariff of SIEA ...................................................78 Table 2-4-5 Operating Mode of Each Generating Unit in 2011.................................................80 Table 2-4-6 Estimated Income and Expenditure for Planned Generating Unit .........................84 ABBREVIATIONS ADB Asian Development Bank AIJ Architectural Institute in Japan ASEAN Association of Southeast Asian Nations AusAID Australian Agency for International Development A$ Australian Dollar DAC Development Assistance Committee DEG Diesel Engine Generator DME Department of Mines and Energy EU European Union E/N Exchange of Notes GDP Gross Domestic Product GNI Gross National Income HPN Honiara Power Network IEC International Electrotechnical Commission ISO International Organization for Standardization JEAC Japan Electric Association Code JEC Japanese Electrotechnical Committee JEM Standards of Japan Electrical Manufacturer's Association JICA Japan International Cooperation Agency JIS Japanese Industrial Standards MOU Memorandum of Understanding NPF National Provident Fund O&M Operation and Maintenance OJT On the Job Training P/S Power Station RAMSI Regional Assistance Mission to Solomon Islands SB$ Solomon Islands Dollar（1 SB$=¥14.75、as of August, 2004） SCADA Supervisory Control And Data Acquisition SIEA Solomon Islands Electricity Authority SIWA Solomon Islands Water Authority S/S Substation SUMMARY SUMMARY The Solomon Islands is an island country consisting of six main islands and some 100 smaller islands lying to the southeast of Bougainville Island of Papua New Guinea and to the northeast of Australia. It has a total national land area of approximately 28,000 km2 (approximately double the size of Fukushima Prefecture in Japan) and a total population of approximately 460,000 (World Bank estimate in 2003). The GNI per capita is US$ 580 (World Bank estimate in 2002). While the ethnic conflict from 1998 to 2002 caused severe economic as well as social damage to the Solomon Islands, the Government of the Solomon Islands has formulated the National Economic Reform and Development Plan (2003 – 2006) to restore the country’s economy and law and order in the aftermath of this conflict. This Development Plan calls for “the rehabilitation of the industrial sector and the rebuilding of infrastructure” as a priority issue for the reconstruction and stabilisation of the country. Power supply is considered to be an essential part of the crucial infrastructure to attract private investment and to reconstruct the national economy. The Solomon Islands Electricity Authority (SIEA) is solely responsible for the electricity service in the Solomon Islands, ranging from the planning of generation, transmission and distribution to operation and maintenance, under the supervision of the Department of Mines and Energy (DME). Electricity supply to Honiara (the capital of the Solomon Islands with a population of some 49,000 according to 1991 statistics) is made from two diesel power stations (Honiara Power Station and Lungga Power Station) and the 33/11 kV transmission and distribution system run by the SIEA. While these two power stations situated in Honiara have a total of 11 generating units, the lack of systematic investment in equipment due to the dire financial situation of the electricity sector has resulted in an insufficient reserve supply capacity. During the period of ethnic conflict, the implementation of periodic maintenance was difficult and the operating conditions of the generating units have worsened, resulting in sudden breakdowns and failures. This insufficient availability of a reserve supply capacity has forced the over-working of the existing generating units. For example, the No.9 unit at the Lungga Power Station which was installed under the previous Japan’s grant aid project (Power Development Project at the Lungga Power Station in FY 1998; hereinafter referred to as “the Previous project”) has been in continuous operation since its commissioning in September, 1999 without any periodic maintenance work. In the face of such a situation, the Government of Japan has provided follow-up cooperation for the procurement of spare parts for the said generating unit and the dispatch
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