SIKKIM - STATE ANNUAL PLAN 2001-2002POWER DEPARTMENTDEMAND NO. 32In accordance to the approved outlay of Rs 265 crores for the Ninth Five Year Plan i.e. 1997-2002, the Department took up various developmental schemes based on the guidelines and programme of the popular Government. As against the above outlay, the Department was eventually awarded the following funds during the successive Annual Plan periods.
Brief accounts of the progress achieved during the period under reference are outlined as under: I.A. GENERATION: 1. Division Scheme associated with Mayongchu Hydel Project: The 2x2 MW Mayongchu Hydel Project is in operation since July 93. Originally this scheme was designed for generation of 4 MW seasonal and 2 MW firm, which means that the optimum generation drops down to 2 MW during the winter months due to low discharge during the lean period. While the adjacent stream known as Ralli khola flowing 4.5 km upstream of Mayongchu intake structure is available for diversion to this head race point to enhance the Mayongchu discharge. This will enable Mayongchu Power house to generate 4 MW throughout the year. The construction of 5 km approach road is in the completion stage while the progress on construction of 4 km long water conductor system has been hampered badly due to fund constraint and unfavourable weather condition accompanied by frequent break-down of North Sikkim highway. As against the total cost of Rs 500 lakhs an expenditure of Rs 441.98 lakhs has already been incurred till March 2001 and the balance of Rs 58 is now required to complete the work. The work is proposed to be completed by 12/2002. 2. Rathongchu Hydel Project (3x10 MW): The Project stands scrapped in view of various sustained religious, social and cultural objections pressed by all sections of community in the State. Now since the State Government is pleased to order its closure w.e.f. 20th August 93, a committee has been constituted to examine various aspects of its consequences pertaining to effective implementation of environmental restoration and use of the assets already created by the project. A total expenditure of Rs 2528.02 lakcs has been incurred towards release of payments to the contractors and suppliers for the completed works and also payment towards the damage compensation including the expenses on multi-disciplinary projects. The payments against the outstanding liabilities for the completed works had to be phased out annually till the last financial year i.e. 2000-01 to contain within the yearly budget even after the closure of the project. 3. Rabomchu Hydel Project (2x1.5 MW): This mini hydel is located at Rabom village near Chungthang in the North district and is under central subsidy scheme sponsored by the MNES. The village falls under the high altitude terrain situated at one of the remotest part of the state fully inhabited by the tribal community. The latest revised cost of the project is as under.
The state as a promoter has to invest 50% against the total cost @Rs 4.5 cr. Per MW intaslled capacity, which is expected to be raised to Rs 6.00 cr. Per MW and the balance has to be supplemented by MNES. The civil construction is in progress and the generating equipment including Power Transformers have already been delivered by the supplier. An outlay of Rs 278.40 lakhs has been provided for expenditure during the Annual Plan 2001-02 under State Plan plus the subsidy instalment of Rs 177 lakhs, which can be availed from MNES. The Project is proposed to be completed by March 2002. Peurey Micro-hydel Scheme (2x100 KW): Preliminary work on this micro hydel scheme was taken up during 1991-92 with some nominal provision. This project could not take off well in the absence of adequate fund due to priority given to other projects in the pipeline. Major civil construction works on this project have already been started. Formation cutting of 560 m long water conductor system has been completed and concreting work is in progress. Almost 50% of the work in respect of water conductor, Intake structure, Forebay and Penstock have been completed. Side by side 70% works on the construction of 1.9 km long approach road to the project site has been completed. As per the decision taken capacity of this project is being reviewed after studying the possibility to add discharge from Ramphapchu, which is flowing adjacent to this project. Till the decision on review of this project is taken, further progress has been stalled for some time; However, an outlay of Rs 55 lakhs has been provided for release of payments to the contracting firms for the completed works. 5. New Diesel Power House at Gangtok: Considering the coming winter load of the State capital and the restriction in drawing states share of central sector power, the Government has been pleased to approve the installation of a 4 MW Diesel units at Gangtok. The generating units have already been commissioned in January ’98. The cost also includes the cost of 11x11 KV switch gear arrangements for arranging synchronisation with the Hydel Power Stations vis-à-vis strengthening of the switching for distribution system in the control room at DPH. With this accomplishment, the uncertainty of power supply due to various odd situation arising out of monsoon damages and winter peakings has been more or less solved. A balance of Rs 25 lakhs is required to defuse the pending liabilities against the completed works. 6. Lachungchu Stage-II (2x1.5 MW): This power house is located close to the boarder of China, where Indian army activities are quite prominent More defense establishments in the locality are being added over the years requiring review of the demand profile. The entire belt is having high potential for tourism and the State Government has given priority for developing infrastructure. Lachung-II has a potential to generate 3 MW seasonal and 1.90 MW firm. This power house can be run in isolation to cater power requirement of the entire belt including defense cantonments. This is a run-of-the-river project towards down stream of the existing Lachung Micro-hydel. A sum of Rs 122 lakhs has already been spent for acquiring lands and infrastructure development works. The Department is going to avail capital subsidy of RS 300 lakhs during the cfy from MNES and a matching fund of Rs 85 lakhs has been provided to take up construction of major works on this project. 7. Mangley Hydel Project (2x500 KW): Development of hydro-power projects in the Rangpochu had been under investigation for the last 8 years. This stream is one of the tributaries of the river Teesta and itself has the tributaries like Gyagyong and Nimang khola. The river originates at Rabong-Dozong area in the South district and flows towards South-East direction amidst dense mixed forest in the upper catchment and meets the river Teesta near Mangalbarey. The scheme envisages diversion of water from Rangpochu at an elevation of 572 meters and utilizes a gross head of 142 meters to generate 1 MW seasonal and 500 KW firm with a designed discharge of 1 cumecs. The detailed survey of this projects was taken up during the year 1995 and subsequently various locations for the proposed structures were fixed. Due care has been taken to avoid dense forest land in order to keep the ecology of the region intact. The Project is located at Namphok village. The Power house building will be located at the left bank of Rangpochu and will house 2 numbers Horizontal Francis Turbines coupled to the Generating units with all the required accessories. The discharge from the tail race will be diverted back into the same river down stream fee from any pollution. The scheme does not involve any displacement of habitat nor submergence of land and property. The project is proposed to be completed within a period of 3 to 4 years time to contain within the year to year fiscal outlays. However, the completion period can be advanced if adequate funds are made available during the plan periods. A sum of Rs 20 lakhs has already been spent for acquiring lands and infrastructure development works. The Department is going to avail capital subsidy of Rs 200 lakhs during the cfy from MNES and a matching fund of Rs 50 lakhs has been provided to take up construction of major works on this project. I.B. RENOVATION SCHEME: The Department is not in a position to attend to the routine maintenance and periodical renovation on all the installations owned by the Department due to the reasons like unproductive expenses on wages and salaries and huge pending liabilities, which was brought to the knowledge of the Government. The existing power stations are not in a position to generate even partly due to inadequate funds for purchase of spares and carry out repairs and renovations. Accordingly, the Government issued instruction to the Department to complete the ongoing works speedily together with renovation and re-strengthening of the power stations in operation and also renovation of other installations pertaining to Transmission and distribution lines and substations. Side by side, a number of 11 KV sub-transmission lines, distribution substations and LT distribution lines were drawn progressively to provide modest quality of power supply to its 56000 consumers in the entire state. All the above installations house a number of supporting structures and equipment, which are always subjected to EDS (Every Day Stress) together with wear and tear of the intricate moving parts acting under automated conditions. The protective and measuring instruments along with instrument and power transformers, communication facilities and switch gear & pilot controls are the main features, which require routine maintenance and periodical replacement of spares. Likewise, the state manages to meet its base load demand from its run-of-the-river hydel power plants having total installed capacity of 33.10 MW. Unlike other mode of generating stations like Thermal, Diesel, Gas or Nuclear, which run on fuel, the hydro generating stations run on availability of water. Quality of water running the Turbines play an important role on its life and output of the machine respectively. As for example, a Diesel engine requires more fuel to run on higher local than at lesser load, the hydro generating sets also require more water to run the turbine at higher load profile. Hydro Power Plants are designed based on the possible regime of water discharge in a river. During the monsoon the discharge is very high and during the lean period the discharge is much less. At the same time the discharge of rivers keep changing over a series of years due to various reasons depending upon their source, nature of catchment area, soil & structure of river bed and rains etc. Calculation of water-power reserves are usually based on 95% of 50% dependable discharge. The state has adopted the discharge domain such that the generation capacity remains at least half the installed capacity during the lean winter months. The schemes being run of the river ones. There is no room for spinning reserve, which means the generation capacity during the winter months can not be raised more than half the generation capacity. Besides, like the Diesel Engines, where the decompression due to wear and tear causes de-ration of capacity, hydro-turbines also follow the same rule and unless these machines are maintained as per the set routine, they become sluggish affecting the generation capacity adversely. As such, it is very important that all the civil structures right form intake weir to tail-race including hydro-mechanical and electro-mechanical parts are maintained and re-strengthened periodically thereby giving them a new lease of life. RENOVATION OF GENERATING STATIONS The scheme aims at restoring the installed capacities of generating units and in some cases maximizing the capacities of old power plants through renovation, modernization and strengthening of structures. The Department has to take up renovation of the following old power plants, which are in operation for a couple of years in depreciated capacities. Lower Lagyap Hydel Project (2x6 MW): (Non-lapsable Central Pool of Funds) The Lower Lagyap Hydel Project is a run of the river scheme. The hydel generating units are designed to operate at a head of 560 metres by utilizing the waters of three streams viz. Roro Chu, Yali Chu and Takchom Chu tapped from three intakes through diversion wairs constructed across those streams. An inter-linking tunnel has been constructed between Rorochu and Yalichu weirs. The water conductor system from the Rorochu and Yalichu weirs to the surge shaft is 6.4 Km long. The water conductor system from the Takchomchu weir to the surge shaft is 4.3 km long. The inclined steel surge shaft is 100 meters long and 2.3 meters in diameter. The Valve House contains three Butterfly valves. One each at the end points of the water conductor systems and one inside the valve house. The Penstock is of 945 mm diameter at the top and 905 mm diameter in the end and is 2.2 km long. The hydro power station has 2 units of 6 MW each with a total installed capacity of 12 MW. The firm generation is 6 MW with a capacity to generate an additional 6 MW seasonal during the monsoon period. The first unit was commissioned on 1.9.1979 and the second unit on 2.11.1979 by utilizing water of Takchom Chu river only. The full capacity generation of 12 MW was, however, achieved only during April 1983 after commissioning of the Roro Chu and Yali Chu water conductor systems. The units have generation voltage of 11 KV which is stepped-up to 66 KV for evacuation to the following load centres: 1. Tadong – to meet the requirement of Gangtok and adjoining areas. 2. Phodong – to meet the requirement of North Sikkim. 3. Melli – to meet the requirement of South and West Districts. 4. Kalimpong – as interstate inter-tie for import and export of power. The 66 KV Transmission portion of the project was constructed by M/S N.H.P.C. Ltd., a Government of India undertaking during the same period. The Lower Lagyap Hydel Project (LLHP), which has a potential of generating 12 MW held out great promise to the people of Sikkim. Since just before its commissioning in September 1979 the total power demand in the state was of the order of 5 MW and the availability with the state was only 3 MW; As such, it was felt that there would be a situation of surplus power and the state would earn additional revenue through sale of surplus power to West Bengal. However, this Project could not provide much relief due to steep rise in demand in the state due to speedy extension of electrification to the districts and villages. Besides, requirement of power particularly during the winter months increased many folds due to use of heating gadgets by the consumers, which could not be met by the generation from LLHP alone due to decrease in generation during the lean season. This Power house forms the major generating station to meet substantial part of power demand of the state and has imported electrical & mechanical equipment supplied by M/S Ganz Mavac of Hungary through BHEL. Except for replacement of spares and minor parts no major repair/overhauling had been carried out since the date of commissioning. These machines have to operate at a head of 560 meters with the waters having very high silt content particularly during the monsoons. The runners of both the units had worn out beyond the scope of economical repairs. Subsequently, the machines were thoroughly renovated and refurbished with imported runners and indigenous spares in the year 1991-92. And now it is time that the Department went for another round of major overhauling within the Ninth five year plan period itself. This Hydel Project has a close conduct water conductor system through the steel pipes all along the lengths. In the course of its operation, considerable lengths of these pipes have worn out and damaged beyond the scope of economical repairs. This is mainly due to corrosion, wear and tear, deformation due to variation in operating pressure and frequent damages on account of land slides, sinking of lands at places and falling boulders. After the Ministry of Power, Government of India considered sanction of Rs 1951 lakhs under Non-lapsable Central Pool of funds for taking up renovation and modernization work on this project, the Department has already started replacement of pipelines together with protective works etc. The job also involves works on electro-mechanical and hydro-mechanical mechanical equipment i/c switch-yard and transformers. As expenditure of Rs 300 lakhs has already been incurred till the end of 2000-01 and the balance of Rs 1651 lacks has been proposed for expenditure during the AP 2001-02. Power Stations in the West District: (3.8 MW) There are four micro-hydels and mini-hydel projects in the West districts viz.
Presently, these power stations are running in isolated mode supplying power radially to the specific towns and villages, which means very poor Plant Load Factor (PLF). If we make an arrangement to synchronise all these power plants into a single grid and hook it to the existing 66 KV system at Gyalshing in respect of the Power stations vide Sr. Nos 2, 3 & 4 and at Rothak in respect of Sr. No. 1 above, PLF will improve significantly raising the annual generation from 3.31 MU to 9.23 MU. Detailed Project Report (DPR) in this respect has been prepared and the same has been submitted to MNES for providing grant in aid. Till such time it is proposed to carry out renovation works on the following Power stations: Rothak Micro-hydel (2x100 KW): Two 100 KW Turgo-wheels installed in 1971-72 at Rothak have been replaced with new Flovel units. These units were supplied and erected by M/S Jyoti Ltd. Of Baroda during seventies had already outlived their useful services and further repair proved uneconomical; As such, the same have been replaced with the units of equal capacities. This micro-hydel requires some strengthening works on Intakes structures, water conductor system and Forebay tank including minor works on replacement spares pertaining to hydro-mechanical equipment. Power stations on Rongnichu cascade: Upper Rongnichu Hydro-electric Project (URHP), Jail Power House (JPH) and Rongnichu stage-II form the cascade projects on Rongnichu all having total name plate capacity of 13 MW. But practically speaking all power plants put together can generate only 8.60 MW as under:
Therefore to avoid future confusion in describing the Installed capacity, it is proposed to review the capacities of above two projects vide Sr. Nos. 1 & 2 above as indicated in the last column. The reason being incapability of the water conductor system to carry water for running more than 2 TG sets in respect of URHP. While in case of the JPH, the TG sets individually can generate 416 KW each but due to constraints in the flume line total capacity reduces to 2.1 MW. Installed capacity of Rongnichu stage-II stands as it is. Major jobs on synchronisation of Jali Power House with Rongnichu stage-II is in progress. The programme is to renovate the Power Stations and improvise 11/66 KV. 5 MVA step up Substation to tie up their generation with the States 66 KV grid. A sanction of Rs 534.34 lakhs is available for repairs and renovations of these Power House in a phased manner with a partial grant-in-aid of Rs 382 lakhs from MNES. Side by side, Jali Power House, which was commissioned in 1965 are under major repairs and renovations. A sanction of Rs 687.78 lakhs is available for repairs and renovations of Jali Power House in a phased manner with a partial grant-in-aid of Rs 420 lakhs from MNES. URHP is already synchronised with the state’s 66 KV grid; As such, PLF of this Power Plant is comparatively good. Once the above jobs get completed, PLF of these power plants would improve significantly. (i) Upper Rongnichu Hydro-electric Project (2x2MW) This Project requires some strengthening works on water conductor system and Forebay tank including minor works on replacement of spares pertaining to hydro-mechanical equipment.
Power Stations in the North District: Mayongchu Hydro-electric Project; (2x2 MW) Mayongchu HEP is also synchronised with the grid but out of two Turgo-generating sets only one machine is in operation condition presently s the other unit developed some serious fault requiring major repairs. The job involves transportation of Generator to Baroda at Jyoti’s works, dismantling of the machine, of the machine, conducting all the required tests and replacement of damaged coils of the stator winding including other reconditioning etc. The manufacturer has given a rough estimate of Rs 23 lacs for the repairs alone. Counting the cost of transportation, taxes, duties and other unforeseen expenses, total estimate has been worked out to Rs 30 lacs. Subject to availability of funds, the job is expected to be completed within 4 months time. Diversion of Ralli khola to May ongchu is in advance stage of completion and once this is completed. Mayongchu HEP is going to generate 4 MW through out the year. Threfore, it is important that the second unit is also restored at the earliest. In this event this powr plant will enhance its generation from 4.32 MU to 17.28 MU.
Lachung Micro-hydel (2x100 KW) This project was completed during the eyar 1991-92. Since then this pwor house has been running continuously in isolatedmode with periodical maintenance. The pwor generated from this pwor plant is supplied to Lachung areas and defence establishment. Now the time has come for its major repairs and renovation to give it a new lease of life. It is proposed to take up the under mentioned works: Its output has come down to 100 KW and its annual generation has been recorded as 0.26 MU. Once the renovation work is completed, the power house will restore its installed capacity and will geneate 0.32 MU. It is proposed to take up the following works:
Chatten Micro-hydel scheme (2x50 KW) Chatten micro-hydel scheme harnesses Lachen chu to generate 100 KW at a drop of 150 ft. This scheme is located near Lachen which is 22 km away from Chungthang. This project has provided relief to the residents of Lachen and has cut down the cost of transmission line across difficult and offending terrains. This scheme was commissioned during the year 1989-90. This pwor house is under break-down condition since Oct 97 due to wear and tear in the hydro-mechanical equipment and subsequent faults, which developed in the Alternator while operation. The entire Lachen area is under black out condition. So far the department could not take any step to restore the units due to fund constraints. Besides there are some restoration works to attend to at the Intake weir. It is proposed to take up the following works:
II. TRANSMISSION & DISTRIBUTION LINES Under the transmission and distribution programme, greater emphasis has been laid on extension of transmission and distribution networks to the uncovered areas as much as possible. Side by side, system improvement works and remodelling of old and unserviceable installations feeding the important load centres have been taken up. Distribution Transformer capacities are being augmented progressively to match the increased load demand. AT the same time, the Department has been making continuous efforts to reduce transmission and distribution loss through the following programmes: 1. Construction of 132 and 66 KV transmission lines for build transfer of power including substations as required. 2. Identifying and locating various load centres in the state and accordingly, proposing required capacity of distributing substations. 3. Development works to meet normal load growth: (a) Extension of 11 KV lines on heavy duty structures with 65 sq.mm ACSR Dog conductor. (b) Extension of 11 KV & L.T. distribution lines in the districts. (c) Additions and augmentation of distribution substations. (d) Providing service connections. (e) Replacement of underground cables. (f) Modernization. 4. Improvement works on existing system: (a) Upgradation. (b) Reconductoring (c) Augmentation. (d) Strengthening and renovation. (e) Replacement of underground cables. (f) Modrnization. Also the department has been carrying out system studies relating to load flow, short circuit conditions, fault level and relay coordination. The objective is to formulate a comprehensive system in the state for achieving optimal utilization of generating capacity including monitoring of load. This will enable the department to plan the long term activities and also day to day operation and outage scheduling, etc. This will add system security thus adding reliability and quality of power supply. The followings are the details of progress. II.A. TRANSMISSION LINES: Presently the Department has been doing up to 66 KV lines under high voltage transmission network and so far four Power stations have been brought into 66 KV grid system. Next the State is taking up 132 KV lines to tie up the State’s transmission network with the 132 KV regional grid to facilitate import and export of power without any restriction. The 66 KV Transmission line between Kalimpong and Melli, which has been serving since early eightees has proved too inadequate to import the stateis requirement of power. Another 66 KV Transmission line from Rangit to Melli belonging to Power Grid Corporation of India has the arrangement to transfer only 10 MVA. The state can draw a maximum of 12 to 14 MW during the peak winter when the state has a share of 68 MW power from the Central Sector power stations in the Eastern Region. The winter peak requirement of the state is going to be 35 MW this year and the power stations in the state all put together will be able to generate only 12 MW excluding Diesel captive plant. As against the peak requirement of 35 MW, availability of power in the state is going to be 24 MW leaving a shortfall of 11 MW, which means extensive load-shedding for long hours during the peak winter months. This point was raised in the EREB Board meeting held in Patna during August 99 and the Member CEA recommended that the board should seriously take up this issue and help extension one 132 KV line to Sikkim at the earliest. II.A.a) ONGOING SCHEMES: 1. Construction of 66 KV line from Rothak to Soreng i/c one 2x2.5 MVA, 66/11 KV Substation at Soreng: The areas covered under Soreng-Chakhung-Kaluk-Dentam are the fast developing load centers in the west district. Presently, these areas are fed through a very long 11 KV distribution network, which is further connected to so many villages. This transmission system is in its advance stage of completion and once it is completed, well provide fairly regulated power supply to this part of west district. This project has been completed in all respects and has provided a great relief to the consumers of Soreng and adjoining areas. 2. Construction of 66 KV line from Lower Langyap to Rongli and one 66/11 KV, 2x2.5 MVA substation at Rongli: The transmission portion of this scheme was completed during the year 1994-95 and was charged at 11 KV. Now the entire works stands completed. The scheme has provided great relief to the remote part of the East district. 3. Providing Remote Terminal Units at Melli & Gangtok i/c PLCC Equipment modernization and refurbishment etc. in respect of old 66 KV Installations: While taking over the old 66 KV Transmisison lines and associated installations from CWC and NHPC during the early eighties, most of the PLCC equipment were found non-functional due to non-availability of spares. The departments attempt to restore these equipment back to working condition failed as the model had become redundant. Such communication links are required to be established at LLHP. Melli-Kalimpong and LLHP-Tadong and Phodong. Besides, Power Grid Corporation of India Ltd, has proposed to install RTUs at Melli and monitoring units at Melli and Gangtok for arranging unified load dispatch center. II.A.b) NEW SCHEMES DURING THE NINTH FIVE YEAR PLAN: The following new schemes under Transmission Lines have been taken up during the ninth five year plan to suit the generation programme and evacuation to their respective load centers: All the schemes indicated were proposed to be completed during the Ninth Plan period itself. Construction of 66 KV line from Sichey to Ganeshtok and one 66/11,2x10 MVA substation at Ganeshtok i/c one extension bay at Sichey 66 KV substation: This scheme has been conceived after keeping in mind of the long term prospect held by the popular Government to expand the capital town for wider perspective. Presently, the state capital Gangtok is fed from two major substation through the same transmission line handed over by the Government of India along with Lower Lagyap Hydel Project about 14 years back. If this transmission line breaks down, the state capital will have to suffer black out for indefinite period of time. In the absence of such transmission system, the Department is not being able to guarantee quality and reliable power supply to the state capital, which being the haven for the tourist is also a place of great importance and prestige. Accordingly, this scheme has been conceived as an alternative outlet for Gangtok urban and suburban areas areas vis-à-vis to take care of the future requirement of the locality. Construction of one 66 KV line from Melli to Mamring i/c one 66/11 KV, 1x7.5 MVA Substation each at Mamring (South Sikkim) and Setipul (East Sikkim) for providing power infrastructure to Power Intensive units: This is a very important and long felt project requiring utmost importance for motivating the intending entrepreneurs to start their activities in this belt. Government has sanctioned The scheme at a total cost of RS 1380 lakhs. With this, the state will be able to earn a revenue of Rs 3 crores per annum from each of the two units. Major renovation, refurbishment modernization of the old 66 KV substation: There are four such old substations handed over by the CWC and NHPC, which are in very deplorable condition. These old model equipments are no more manufactured by the manufactures, as such procurement of spares has become a necessary hazard. Use of locally fabricated spares and improvised system has caused undue break-down of power supply to the consumers from these substations. The entire changeover mechanisms have to be operated manually through trial and error method and most of the measuring and protection system are not functioning properly. Therefore, it is proposed to carry out major renovation on these substations and replace as many redundant mechanisms as required with the standard ones. Distribution Substations. The Department has added 2347 km lengths of sub-transmission and distribution lines in the state along with capacity addition of 11675 KVA distribution sub-stations in all the corners of the state including rural areas. Frequent failure of distribution transformers due to the need for dehydration and topping of transformer oil has become a serious concern. Besides, the defective transformers have to be repaired and replaced to avoid public complaints. Adequate provisions will be required to carry out the repairs. Purchase of Energy meters In order to facilitate correct assessment of energy consumption by the hotels and prospective commercial houses in Gangtok to begin with, it is proposed to procure Energy meters of deferent capacities directly from the manufactures. In the first phase of drive, it is proposed to buy sufficient Energy meters for urban areas. System studies relating to transmission system associated with power flow between states generating stations and Central/regional stations: An outlay of Rs 25 lakhs has been proposed under this scheme to carry out studies on the power flow at different conditions like peak load, outages, short circuit, absorption of central sector power and injection of state’s power to the regional grid. The provision also includes training, research and consultancy services as required from time to time. Construction of 132 KV Transmission lines and substations associated with evacuation of Central sector power: Government has accorded sanction of Rs 2627 lakhs for construction of one s/c 132 KV Transmission line from Rangit to Melli and terminate with one 132/66 KV 2x20 MVA substation at Melli. In the absence of requisite fund, the work could not be put to Tender during the year 1999-2000. However, some funds are being utilized for replacement of 10 MVA 132/66 KV Transformer with 20 MVA 132/66 KV Transformer at Rangit S/Y together with swithing arrangements at Melli 66 KV S/S. The work has been tendered and bid evaluation completed. The proposal is lying with the Government for consideration of the enhanced cost. Unless the MOP provides funds under central grant through Non-lapsible central pool or APDP, with project can not take off leaving the state under heavy load shedding the coming winters. 66 Transmission line & Substation for Reteral Hospital: The Department has taken up a small portion of Transmission line and one 2.5 MVA Substation to meet the power requirement of Referal Hospital at Tadong. Total cost of the scheme has been worked out to Rs 150 lakhs. Of which Rs 100 lakhs has been accommodated under State Plan and the balance of Rs 50 lakhs has been availed under Non-lapsable pool of central resource. Power Supply to VIP complex at Gangtok: Total cost of this job has been worked out to Rs 200 lacks and the work has been taken up on priority basis to provide power to the Gangeshtok Ministers colony. This cost has also to be accommodated under State Plan. Total cost of the scheme has been worked out to Rs 200 lacks. Of which Rs 100 lacks has been accommodated under State Plan and the balance of Rs 100 lakhs has been availed under Non-lapsable pool of central resource. Shitting of 66 KV towers at Kateng, Kamlet and Sikkip in South District: In view of land slides and sinking of lands along the 66 KV Transmission line linking Gangtok through Melli, seven numbers of Towers have to be shifted to new locations. This work has to be taken up on priority to complete the work before the coming monsoon. The following schemes are also of important nature in-as-much-as system requirement is concerned for attaining regulated and reliable power supply in the remote areas of the districts. The same are included in the Ninth Plan but could not be given a start due to inadequate provisions under state plan outlays. 1. Construction of 66/11 KV, 2x2.5 MVA substation at Mangan: 2. Construction of 66 KV line from Soreng to Sombaria including one extension bay at Soreng and one 66/11 KV, 2x2.5 MVA Substation at Sombaria: 3. Construction of one 66/11 KV, 2x2.5 MVA substation with LILO arrangement at Pakyong: 4. Construction of 66 KV Transmission line associated with evacuation of power from North Sikkim Generation Stations: 5. Construction of 66 KV Transmission line associated with evacuation of power from West Sikkim Generation Stations: 6. Construction of 66 KV line from Rolep to Rongli including one extension bay at Rongli 66 KV Substation: II.B. SUB-TRANSMISSION & DISTRIBUTION LINES: A number of schemes pertaining to extension of 11 KV lines, addition of new distribution substations and L.T. distribution lines are being taken up systematically over the past plan periods. These schemes are aimed at providing electricity to the newly developed localities in the urban and suburban areas all over the state along with up-gradation and strengthening of the existing installations. In some cases substation capacities are being added along with L.T. Distribution lines to cope up with the increased load demand due to growth of residential and commercial complexes in the urban and sub-urban areas in the state. The Department had taken up a number of small schemes spread all over the state during the 8th plan and some more schemes were added after the new popular government took over the office during the year 1994-95 to fulfil the aspiration of the people of Sikkim. The following works are proposed to be taken up during the AP 2000-01. 1. Remodelling and strengthening of 11 KV sub-distribution lines and LT distribution lines along Tibet Road in Gangtok. 2. System Improvement and remodelling of sub-transmission and distribution network including additions and augmentation substations along Children Park and Motor Stand in Gangtok. 3. Renovation and refurbishment of 11 KV distribution system at Sichery, Tadong, Phodong, Melli, Soreng and Gyalshing substations. 4. 11 KV Trunk line from Tadong to Deorali, Estimated cost: 5. 11 KV Trunk line from Namchi to Rabongla, Estimated cost: 6. 11 KV Trunk line from Singtam to Makha. Estimated cost: 7. 11 KV Trunk line from Soreng to Sombaria. Estimated cost: 8. 11 KV Trunk line from Ranipul to Pakyong, Estimated cost: 9. 11 KV Trunk line from Rongli to Rolep, Estimated cost: 10. 11 KV Trunk line from Rongli to Rhenock. 11. 11 KV Trunk line from Ranipul to Rumtek. 12. 11 KV Trunk line from Rabongla to Ralong. 13. 11 KV Trunk line from Mangan to Tong. 14. Development works to meet normal load growth and improvement in the existing system of Gangtok, Mangan, Namchi and Gyalshing district Head Quarters. 15. Boarder Area Development Programme Estimated Cost: (Outside the scope of provision under S/P). Once the above Transmissions lines and other renovation works are completed and commissioned the townships which had been suffering poor quality power will be greatly benefited with much regulated and quality power supply system. III. RURAL ELECTRIFICATION SCHEME: The most important area which contributes considerable T&D losses is due to the extensive uses of 11 KV transmission and distribution network while implementing Rural Electrification schemes. Besides, the use of 10 KVA single phase transformers by extending single phase lines based on the REC norms has led to all time complaints from the rural consumers because of random failure of single phase transformers. These transformers provided inadequate ones the people started taking service connections. Accordingly, these transformers are being replaced with three phase transformers of required capacities. Side by side, 11 KV lines and L.T. distribution lines are being strengthened. Under this scheme, 1200 free connections were released to the poor house-holds in the State during the last three years. IV. CONSTRUCTION OF BUILDINGS: A number of residential and non-0residential buildings have been constructed and some are under construction for establishment of new subdivisional head quarters at Chungthang, Dentam, Soreng, Namchi, Sombaria, Rongli and Mayong, Side by side, some more building are added at Gangtok and the districts for providing accommodation to employees of the Department. V. SURVEY AND INVESTIGATION: On the basis of the available hydrometeorological, geo-technical data and after verifying the sites identified from the maps, the Power Department conducted studies on the enlisted tributaries which were found to be potentially viable ones. The main and sub-tributaries are listed as under: i) Tributaries of Rngit such as Rathangchu, Rimbi Khola, Ralli Khola, Ralli chu, Ramam/Rabong Khola, Kalez Khola, Rishi Khola and Manpur Khola. ii) Rangpo Chu and its main tributaries Rangli Khola, and the sub-tributaries of Rangpo Chu and Rangit Khola. iii) Dik Chu and its main tributaries like Bakcha Chu and Ratey Chu. The main tributaries that join the main Teesta River directly, such as Runn Chu, Rang Phap Chu, Rangpo Khola etc. Inspection of the possible sites for development of mini/micro/small hydel schemes was done in two spells, one in the beginning of February 1987 and the other in the end of February 1987. There are thirty –nine power schemes, which have good access. The schemes have been identified in view of their geo-technical soundness, which will present no difficulty during construction enabling earlier completion. Also the creation of infrastructure facilities will not take very long time. Out of these schemes some have been implemented and some are in the process. VI. DIRECTION & ADMINISTRATION: In order to meet the expenses on establishments and office expenses, the fund will be required as projected in the enclosed statement. VII. SIKKIM POWER DEVELOPMENT CORPORATION LIMITED: Sikkim has an immense power potential from its water resources. On the Teesta basin alone the power potential has been estimated to be 3365 MW. In other to make use of this power potential for future economic development and economic self reliance, this year, the state Government formed Sikkim Power Development Corporation Ltd. A corporate entity which can raise the necessary resources to implement attractive schemes. Besides the four projects, it has been allotted as mentioned in earlier pages, it has planned to take up at least one stage of Teesta and the implement the same at reasonably fixed cost and fixed time basis. The state has resolved to undertake power sector reforms in line with the Government of Indiais increasing emphasis on State Power Sector Reforms. With the view in mind, the popular Government of Sikkim has formed the Sikkim power Development Corporation Limited (SPDC) in its efforts to provide clean, pollution-free and cheap electricity by exploiting its vast hydro electric power potential. This has given rise to new hopes and excitement of possible future economic development and prosperity for the State. Therefore, Corporatisation process is the primary requirement towards commercialisation of Power Sector. Accordingly SPDC with the above main objects came into existence on 11.12.1998 within the provision of the Registration of Companies Act, Sikkim 1961. Financing pattern applicable to SPDC is generally the same as being applicable to all other such corporations. However, keeping in mind the financial position of the State, the only route available is the Project Recourse Financing. To be more precise, projects have to be picked and managed such that it would be viable to pay back their debts as well as service the equity, if any, as allowed under the prevailing Power Policy of the Govt. of India. However, any equity or financial support from the State shall necessarily help the projects to reduce debt components and thereby give the State a return of 16% per annum on such equity or financial support. An authorised share capital of the Company is Rs 500.00 crores divided into five crores equity shares of Rs 100.00 each.
The above projects were originally conceived with a total estimated capacity of 61 MW but after detailed studies on economic and efficacious site condition, it is possible to raise the installed capacity from 61 MW to 116 MW. These projects will be funded by mobilising funds through market borrowings and are intended to be executed within a time frame of three to four years on fixed cost & fixed time principle. Since Power Department is a department of the State Government, it can not resort to overseas borrowings and other project recourse financing directly. Besides, a department of a government can not function with equal freedom as an enterprise, which is a pre-requisite for success of any commercial organisation. It may be placed on record that its maiden attempt to raise initial funds for its four projects have been very successful and therefore it is confident that it will be able to raise the necessary resources for atleast one large project of Teesta to begin with and seek the support of the Planning Commission. A nominal sum of Rs 150 lakhs has been provided as equity participation from SPDC for the AP 2001-2002. initially it is proposed to raise a total of Rs 30000 lakhs for four hydel projects. These projects are proposed to be completed within a period of three years on fixed time and fixed cost principle. Besides, the state has issued notice inviting proposals from IPPs for implementation of Teesta IV and VI under private sector. There are seven parties who have shown their keen interest to take up these projects and have deposited registration fees of Rs 50,000/- per project. The Department got the RFO prepared from the SPDC and issued to these interested parties for submission of their offers. VIII. INTEGRATED STUDIES ON TEESTA CASCADE: The State Power Department is the first to point the need and urgency of the study and have already submitted a detailed proposal to the Planning Commission. The state Government has posed it for financing through non-lapsable central pool of funds. Since water is a state subject and water resources of Teesta is the only life line of stateis future economic development. State Government has decided to undertake this study in coordination with Central Water Commission (Ministry of Water Resources). IX. EAP: The State Power sector has not availed any fund under EAP so far. ANNUAL PLAN (2001-02) |
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