Village Electrification in East District of the State of Sikkim under the Rajiv Gandhi Grameen Vidyutikaran Yojana

Rajiv Gandhi Grameen Vidyutikaran Yojana (RGGVY) for the State of Sikkim in :

East District
West District
North District
South District

Village Electrification in East District of the State of Sikkim under the

Rajiv Gandhi Grameen Vidyutikaran Yojana (RGGVY)

Executive Summary

The national policy on Rural Electrification formulated by Govt. of India envisages

􀂾 Electrification of all villages by 31^st March 2007.

􀂾 Extend universal access of power to all the households by the year 2012.

For this, the Government of India has launched a new scheme “Rajiv Gandhi Grameen Vidyutikaran Yojana (RGGVY). The scheme is being implemented through the Rural Electrification Corporation. Government of Sikkim has considered under RGGVY, the electrification of un-electrified/virgin Hamlets as well as the intensification programme in all the four Districts of Sikkim. The project shall meet the universal obligation to provide electricity to all consumers on demand and the rural areas shall be provided with quality and reliable power at par with the urban areas. 100% households shall be covered under this scheme. The project has the Code no. SK-04-0506,

1 Project Details

The project area spreads over the entire East District, which has the area of 954 sq.km. As per census-2001 there are 131 villages and all are electrified as on 31^st March 2005. Out of 131 villages, 7 electrified villages have been converted to notified town area and others; as such they are not included in this project. All these villages are connected through grid. However there are certain hamlets within these villages which are yet to be electrified due to geographical remoteness and topographical difficulties and will be electrified through present scheme.

1.1 The scheme includes 124 villages having 475 hamlets out of which 405 are electrified and balance 70 Hamlets are to be covered under this scheme.

1.2 The project envisages usage of DTs of appropriate capacity which has been arrived at after taking into account the unutilized capacity of the existing DTs and also taking care to see that the existing DTs are within the prescribed loading limits. Depending upon the existing load condition and the number of new connections required, the transformers of 10 kVA or 25 KVA are proposed. Total capacity of DTs proposed is 560 KVA considering future load growth.

2 11/11 Kv Switching stations and associated heavy duty Dog line.

During the rural electrification works in the eighties 11 kV lines were tapped at the nearest locations directly by jumpering without establishment of switching stations in between. This has created multiple spur lines running to different places without the provision of switgears in between for isolation. This has resulted in lots of disturbance and a fault at remote locations causes entire feeder to trip thereby causing sufferings to large sections of the population. This situation has caused very high negative impact on revenue realization. Therefore in order to improve the supply system at rural areas in terms of quality and continuity of supply, the installation of 11/11 kV switching stations must be constructed. This will help to isolate the fault to the particular section of the line thereby the undue disturbance to the other connected feeders and spur lines doesn’t get effected. This will further improve the Reliability Index of the existing feeders and will help the utility to improve the revenue collection. Since the 11/11 control stations has to be located at suitable point so as to be able to connect all spur feeders through switching panels, new 11 KV feeding lines are required. Further new 11 kV lines using Dog conductor is proposed in order to bring the Voltage Regulation to the accepted level.

3 Modalities for implementation

3.1 Latest practices shall be adopted for design, procurement, and erection and commissioning of over-head lines, substations, service connections and household wiring. Indian Standard Specification and State Government Manual in the field of Engineering; Procurement & Quality Assurance shall be adopted. For procurement of goods and services, the standard guidelines of REC shall generally be adopted, including the standard bidding procedure. Further,

􀂾 LT lines have been kept to the minimum to minimize line loss.

􀂾 Load balancing of lines by load re-arrangement is being planned for laying of majority of LT lines so and increased reliability is achieved.

3.2 The whole project is proposed to be executed on turn-key basis, for the purpose of providing better quality of work and equipment. Supply of Distribution Transformers will be kept as separate package to exercise direct control on the quality of the transformers. All the works for construction of HT/LT lines will be on turn-key package.

3.3 It is proposed to implement the project over a period of about two years. The proposed ‘Zero Date’ will be counted from the date of release of first installment of payment by REC.

3.4 Particulars of the work under a turn-key contract have been prepared and are tabulated in the relevant section of DPR. Cost figures for the various items have been considered from the latest Government approved schedule of rate of Energy & Power Department, Sikkim.

4 Background

4.1 Energy is the resource input by which the human civilization grows. In the process of human development, various sources for energy have been evolved. Out of all of them, electricity has become the most adopted and easily controllable source of energy. Today, Electricity has become a fundamental necessity for the livelihood of human beings just as air and water. In Sikkim the electrification started during the seventies only. Till then it was available only in Gangtok and few town areas. Then with the help of REC funding, the village electrification was carried out during 1986-87, however 100% households couldn’t be covered then.

4.2 The status of village electrified as on 31^st March 2005 for the state of Sikkim as per 2001 Census.

S.No

Total no. of

villages

Total no. of

Villages electrified

Balance villages to

be electrified

Percentage of village

Electrified as per new definition

450

425

94%

4.3 The status of village electrified as on 31^st March 2005 in EAST DISTRICT as per 2001 Census.

S.No

Total no. of

villages

Total no. of

Villages electrified

Total nos of hamlets

Total nos of hamlets electrified as on 31.3.2005

Balance hamlets to be electrified

131

131(7 notified as town area & others)

475

405

CHAPTER II

1. Introduction.

1.1 The Government of India has approved a new scheme “Rajiv Gandhi Grameen Vidyutikaran Yojana (RGGVY)-A scheme for rural electricity structure and household electrification and the guidelines were issued by the MOP. The national policy of Rural Electrification envisages the state governments to ensure;

􀂾 To provide access to electricity to all rural households in the project area within the stipulated time frame.

􀂾 All BPL households in rural habitations in the villages should be covered for electrifications as per the Kutir Jyoti norms.

1.2 The project will be categorized as Rajiv Gandhi Grameen Vidyutikaran Yojana, with a proposed Code no. SK-04-0506.

1.3 The project includes works that would be required to electrify the unelectrified villages as per new definition of village electrification issued by MOP, vide their letter No. 42/1/2001-D(RE) dated 5th February 2004 and its corrigendum vide letter no. 42/1/2001-D(RE) dated 17th February 2004.

1.4 As per the new definition, a village would be declared as electrified, if

􀂾 Basic infrastructure such as Distribution Transformer and Distribution lines are provided in the inhabited locality as well as the hamlet where it exists.

􀂾 Electricity is provided to public places like Schools, Panchayat Office, Health Centres, Dispensaries, Community centers etc. and

􀂾 The number of households electrified is at least 10% of the total number of households in the village.

1.5 Government of Sikkim, have considered under the RGGVY, electrification of un-electrified villages in the East district departmentally.

1.6 To study the existing system and have a preliminary study and data collection, the Energy & Power Department Engineer/officials undertook the extensive survey of entire East District and the formats provided by REC are filled based on the data of this survey.

2. Project Objectives & Deliverables.

2.1 The proposed scheme includes complete electrification of virgin (un-electrified) villages of East district of Sikkim.

The scheme shall be for extension of power supply to domestic, public institutions etc in the area. General description of the Project Objectives is as given below.

a) To electrify all the un-electrified villages East district of Sikkim.

b) To electrify all the BPL households in the project area under this scheme...

c) To electrify 100% of the households of the East District including the public places in these villages.

d) To create infrastructure for providing electricity to all consumers in the project area on demand.

e) To examine the existing electrical system feeding the new system & setting up healthy rural electricity back bone required for a reliable operation of the new system.

f) To have necessary provisions for setting up at least one Distribution Transformer (DT) in each un-electrified/virgin villages.

2.2 Deliverables.

The scheme for electrification/extension of electrical supply to the villages would include following:

a) 11kV lines

b) 11/0.415 kV Distribution Transformer stations

c) LT lines

d) Service connections to different types of consumers

e) Adoption of new technology IT solutions.

2.3 Demographic data of the Project Area.

As per the census data released for the decade 1991-2001, the demographic data for state of Sikkim and East district are given as below.

S.No	Particulars	Sikkim	East District
1	Population	540851	245040
a	Rural	480981	189647
b	Urban	59870	55393
2	Nos. of villages	459	124(7 notified as town area out of 131)

2.4 Description of the Habitat in the Project Area.

The East District is has the largest population in the state. It has approximately 22 % urban population and 78 % of rural population. The altitude ranges from 2000 ft. to 24000 ft. making some of the hamlets inaccessible during the winter months. The hamlets within a Village are located at large distance to each other. The houses in the hamlets are also located at disperse locations.

2.4.1 Economic state of the household population (both BPL and General) is extremely poor. Nevertheless, people in general are eagerly awaiting the arrival of electricity in these villages.

2.4.2 The existing system is fed through long 11 kV weasel lines mostly and is prone to frequent disturbances and has poor voltage regulations. The new system proposed shall cover all of the un-electrified hamlets of the electrified villages.

2.4.3 The entire area under East District are fed by a 66/11 kV network. The East District has 4 nos 66/11 kV substation in operation with a total transformation capacity of 37.5 MVA. There are three run off the river hydel projects viz; LLHP HEP (12MW), JPH (2 MW) & URHP HEP (8 MW). LLHP and URHP are connected to 66 kV grid where as JPH directly supplies the local areas.

2.4.4 It is noted that the some of the 11kV feeders, are typically having lengths of more 70.5 kms to 131 kms with spur line lengths going sometimes to more than 51 kms.

2.4.5 Max. Load on the feeders varies between 0.04 MVA to 3.5 MVA as per feeder meter data.

2.4.6 As observed in the survey, within the village, a distance of more than 20 kilometer separates the hamlets from each other, and accordingly the project scheme envisages usage of small size DTs in a typical HVDS arrangement in line with REC guidelines. This would also lead to optimization of 'LT' Line lengths in the rural areas. Majority of DTs are with 10/25 kVA rating to have less LT network.

3. Preliminary Field Survey.

3.1 Immediately, on receipt of communication from Project Office of Rural Electrification Corporation, Kolkata, the project works commenced with taking up a preliminary survey. All the concerned field engineers and staffs were geared up for carrying out preliminary survey of the geographical area for estimation of entire work of electrification of virgin villages and intensification of electrified villages.

3.2 All the villages identified in the Project Report were visited for estimation of loads and approximate quantity of equipment with routing of lines.

3.3 The survey scope covered the following areas;

􀂾 Detailed preliminary walk down survey along the virgin villages.

􀂾 Identification of category wise customers (like BPL, APL), and category wise No. of households to be connected.

􀂾 Preparation of database on routing with lengths of all 11kV /LT lines, location of distribution transformers (DT), length of service line etc.

� Information in REC formats.

3.4 The preliminary survey works have brought forward following information with regard to the existing system/provisions in these blocks.

􀂾 11kV existing lines are within short distance from most of the villages. Therefore, tap off point is easily accessible. However, it is apprehended that the sources of 66/11kV Sub-station from the tap off location is longer than 70 Kms.

􀂾 There are 124 villages, each villages have multiple hamlets located at wide areas.

4. Beneficiaries.

4.1 The total number of villages in East District is 131 as per census-2001 data and these are inhabited villages, out of which 7 has been notified as town areas and others as such are not considered in the present project. All these, 131 villages are electrified as on 31^st March 2005. This requires intensification programme.

4.2 This project intends to electrify all the un-electrified households in East District. List of villages considered for electrification, with census code, status of electrification, no of households & population has been attached in Annexure as per relevant REC formats.

4.3 The project shall meet the universal obligation to provide electricity to all consumers on demand.

4.4 In un-electrified village areas, 100% grant is being provided for electrification of BPL households. Accordingly, BPL households shall be fully benefited by the work under execution in this project.

4.5 While estimating the number & capacity of distribution transformers for rural Households, load of 0.5 KW (with a diversity factor of 1.5) per consumer has been considered for general category of consumers and 0.06 KW for BPL category of consumers. The DTs proposed in this scheme is to minimize the L.T length in the hamlets so that the voltage at the consumer end is of higher quality. It had to be taken as the hamlets are wide spread for each other. Accordingly, 44 nos. of sub station are proposed.

4.6 Number of other projects/schemes for electrification is under way, in the vicinity of the villages being considered for electrification under RGGVY. However, the hamlets under the project are not covered under any other scheme. Accordingly, it has been ensured that, no work is duplicated under this scheme, which is being executed by other agencies, under the supervision of the State Electricity Department.

6. Revenue Management.

6.1 One of the most favored systems of revenue management in rural electrification schemes is the use of Panchayats/ Co-operative Societies/ Private Individuals. The modus operandi considered for the purpose shall be on the following broad guidelines:

a. These groups would mobilize consumer’s respective villages to be electrified in the scheme in such a manner that after completion of the construction; service connection to the consumer can be made effective immediately. Thus time lag for receiving request / response from the consumer can be avoided.

b. The arrangements would help maintain the time-schedule for commissioning the project.

c. The role of these agencies can be enlarged in a manner by which the agencies would be able to take sufficient actions to protect the system from being damaged due to theft of power-equipment and energy.

CHAPTER-I

Village Electrification in West District of the State of Sikkim under the

Rajiv Gandhi Grameen Vidyutikaran Yojana

Executive Summary

The national policy on Rural Electrification formulated by Govt. of India envisages

􀂾 Electrification of all villages by 31^st March 2007.

􀂾 Extend universal access of power to all the households by the year 2012.

For this, the Government of India has launched a new scheme “Rajiv Gandhi Grameen Vidyutikaran Yojana (RGGVY). The scheme is being implemented through the Rural Electrification Corporation. Government of Sikkim has considered under RGGVY, the electrification of un-electrified/virgin villages as well as the intensification programme in all the four Districts of Sikkim. The project shall meet the universal obligation to provide electricity to all consumers on demand and the rural areas shall be provided with quality and reliable power at par with the urban areas. 100% households shall be covered under this scheme. The project has the Code no. SK-02-0506.

1 Project Details

The project area spreads over the entire West District, which has the area of 1166 sq.km. As per census-2001 there are 121 villages out of which 113 villages are electrified as on 31^st March 2005. These leave 8 un-electrified virgin villages. All these villages can be connected through grid.

1.1 Within these 8 virgin villages, all rural households will be benefited by this project. Including the balance households in other villages already electrified.

2.6 11/11 KV Switching stations and associated heavy duty Dog line.

During the rural electrification works in the eighties 11 kV lines were tapped at the nearest locations directly by jumpering without establishment of switching stations in between. This has created multiple spur lines running to different places without the provision of switchgears in between for isolation. This has resulted in lots of disturbance and a fault at remote locations causes entire feeder to trip thereby causing sufferings to large sections of the population. This situation has caused very high negative impact on revenue realization. Therefore in order to improve the supply system at rural areas in terms of quality and continuity of supply, the installation of 11/11 kV switching stations must be constructed. This will help to isolate the fault to the particular section of the line thereby the undue disturbance to the other connected feeders and spur lines doesn’t get effected. This will further improve the Reliability Index of the existing feeders and will help the utility to improve the revenue collection. Since the 11/11 control stations has to be located at suitable point so as to be able to connect all spur feeders through switching panels, new 11 KV feeding lines are required.

2 Existing system

2.1 The entire area of West District are fed from three 2x2.5 MVA, 66/11 kV Sub station at Gyalshing, Soreng & Rothak respectively, which are connected to the state grid through 66 kV lines originating at 2x50 MVA, 132/66 kV SubStation Melli. There are three power generating stations viz. Rimbi Stage I (2x300KW), Stage II (2x500KW) & Kalez Khola (2x1MW).Two of these hydel projects Rimbi Stage I (2x300KW) & Stage II (2x500KW) run in isolation catering to the local areas. Kalez Khola (2x1MW) is connected to the grid.

The West District has 12 nos. of 11 kV feeders. Max. Load varies between 14 to 16 MVA. A total of 52 nos. of 11kV spur lines shall be tapped at appropriate locations to construct 11kV lines for making supply arrangements to the designated virgin villages as well as the un-electrified hamlets.

2.2 A review of the existing system with regard to loading of 11kV line feeders was done by the Energy & Power Department, Govt. of Sikkim, through the concerned field engineers of respective districts. The existing lines are found to be extremely long both in trunk and spur line sections and also heavily loaded. The houses are sparsely located i.e. in the district the individual houses are located at long distances unlike in the other states where cluster of houses are found at villages. This requires long distribution lines to feed every individual houses and the cost per km of line is higher than as compared to other states. This has contributed to higher energy losses and poor voltage regulations. Thus the cost per village is higher in the case of this district which is true for whole of Sikkim state. The augmentation works needed to be carried out couldn’t be included due to limitations in cost per village.

3 Modalities for implementation

3.1 Latest practices shall be adopted for design, procurement, erection and commissioning of over-head lines, substations, service connections and household wiring. Indian Standard Specification and State Government Manual in the field of Engineering; Procurement & Quality Assurance shall be adopted. For procurement of goods and services, the standard guidelines of REC shall generally be adopted, including the standard bidding procedure. Further,

􀂾 LT lines have been kept to the minimum to minimize line loss.

􀂾 Load balancing of lines by load re-arrangement is being planned for laying of majority of LT lines so and increased reliability is achieved.

3.2 The whole project is proposed to be executed on turnkey basis, for the purpose of providing better quality of work and equipment. Supply of Distribution Transformers will be kept as separate package to exercise direct control on the quality of the transformers. All the works for construction of H.T/ L.T lines will be on a turnkey package.

3.3 It is proposed to implement the project over a period of about one year. The proposed ‘Zero Date’ will be counted from the date of release of first installment of payment by REC.

5 Background

5.1 Energy is the resource input by which the human civilization grows. In the process of human development, various sources for energy have been evolved. Out of all of them, electricity has become the most adopted and easily controllable source of energy. Today, Electricity has become a fundamental necessity for the livelihood of human beings just as air and water. In Sikkim the electrification started during the seventies only. Till then it was available only in Gangtok and few town areas. Then with the help of REC funding, the village electrification was carried out during 1986-87, however 100% households couldn’t be covered then.

5.2 The status of village electrified as on 31^st March 2005 in WEST DISTRICT as per 2001 Census.

S.No

Total no. of

villages

Total no. of

Villages electrified

Balance villages to

Be electrified

Percentage of village

Electrified as per new definition

121

113

85%

CHAPTER II

1. Introduction.

􀂾 To provide access to electricity to all rural households in the project area within the stipulated time frame.

􀂾 All BPL households in rural habitations in the villages should be covered for electrifications as per the Kutir Jyoti norms.

1.2 The project will be categorized as Rajiv Gandhi Grameen Vidyutikaran Yojana, with a proposed Code no. SK-02-0506.

1.4 As per the new definition, a village would be declared as electrified, if

􀂾 Basic infrastructure such as Distribution Transformer and Distribution lines are provided in the inhabited locality as well as the hamlet where it exists.

􀂾 Electricity is provided to public places like Schools, Panchayat Office, Health Centres, Dispensaries, Community centers etc. and

􀂾 The number of households electrified is at least 10% of the total number of households in the village.

1.5 Government of Sikkim, have considered under the RGGVY, electrification of un-electrified villages in the West district on turnkey basis.

1.6 To study the existing system and have a preliminary study and data collection, the Energy & Power Department Engineer/officials undertook the extensive survey of entire West District and the formats provided by REC are filled based on the data of this survey.

2. Project Objectives & Deliverables.

2.1 The proposed scheme includes complete electrification of virgin (un-electrified) villages of West district of Sikkim.

The scheme shall be for extension of power supply to domestic, public institutions etc in the area. General description of the Project Objectives is as given below.

a) To electrify all the un-electrified villages West district of Sikkim.

b) To electrify all the BPL households in the project area under this scheme.

c) To electrify 100% of the households of the West District including the public places in these villages.

d) To create infrastructure for providing electricity to all consumers in the project area on demand.

e) To examine the existing electrical system feeding the new system & setting up healthy rural electricity back bone required for a reliable operation of the new system.

f) To have necessary provisions for setting up at least one Distribution Transformer (DT) in each un-electrified/virgin villages.

2.2 Deliverables.

The scheme for electrification/extension of electrical supply to the villages would include following:

a) 11kV lines

b) 11/0.415 kV Distribution Transformer stations

c) LT lines

d) Service connections to different types of consumers

e) Adoption of new technology IT solutions.

2.3 Demographic data of the Project Area.

As per the census data released for the decade 1991-2001, the demographic data for state of Sikkim and West district are given as below.

S.No	Particulars	Sikkim	West District
1	Population	540851	123256
A	Rural	480981	121432
B	Urban	59870	1824
2	Nos. of villages	459	121
3	Decadial Growth Rate	32.98%	---

2.4 Description of the Habitat in the Project Area.

The West District is the second largest District of Sikkim and has some of the remotest villages and hamlets in the country. It has approximately 2 % urban population and 98 % of rural population. The altitude ranges from 1600 ft. to 5500 ft. The hamlets within a Village are located at large distance to each other. The houses in the hamlets are also located at disperse locations.

3. Preliminary Field Survey.

3.2 All the villages identified in the Project Report were visited for estimation of loads and approximate quantity of equipment with routing of lines.

3.3 The survey scope covered the following areas;

􀂾 Detailed preliminary walk down survey along the virgin villages.

􀂾 Identification of category wise customers (like BPL, APL), and category wise No. of households to be connected.

􀂾 Preparation of database on routing with lengths of all 11kV /LT lines, location of distribution transformers (DT), length of service line etc.

� Information in REC formats.

4. Beneficiaries.

4.1 The total number of villages in West District is 121 as per census-2001 data and these are inhabited villages. Out of these, 113 villages are electrified as on 31^st March 2005.

4.2 The project shall meet the universal obligation to provide electricity to all consumers on demand.

4.3 In un-electrified village areas, 100% grant is being provided for electrification of BPL households. Accordingly, BPL households shall be fully benefited by the work under execution in this project.

4.4 While estimating the number & capacity of distribution transformers for rural households, load of 0.5 KW (with a diversity factor of 1.5) per consumer has been considered for general category of consumers and 0.04 KW for BPL category of consumers. The DTs proposed in this scheme is to minimize the L.T length in the hamlets so that the voltage at the consumer end is of higher quality. It had to be taken as the hamlets are wide spread for each other. Accordingly, 52 nos. of sub station are proposed.

4.5 Number of other projects/schemes for electrification is under way, in the vicinity of the villages being considered for electrification under RGGVY. However, the virgin villages under the project are not covered under any other scheme. Accordingly, it has been ensured that, no work is duplicated under this scheme, which is being executed by other agencies, under the supervision of the State Electricity Department.

5. Revenue Management.

5.1 One of the most favored systems of revenue management in rural electrification schemes is the use of Panchayats/ Co-operative Societies. The modus operandi considered for the purpose shall be on the following broad guidelines:

b. The arrangements would help maintain the time-schedule for commissioning the project.

CHAPTER-I

Village Electrification in North District of the State of Sikkim under the

Rajiv Gandhi Grameen Vidyutikaran Yojana

1 Executive Summary

The national policy on Rural Electrification formulated by Govt. of India envisages

􀂾 Electrification of all villages by 31^st March 2007.

􀂾 Extend universal access of power to all the households by the year 2012.

For this, the Government of India has launched a new scheme “Rajiv Gandhi Grameen Vidyutikaran Yojana (RGGVY). The scheme is being implemented through the Rural Electrification Corporation. Government of Sikkim has considered under RGGVY, the electrification of un-electrified/virgin villages as well as the intensification programme in all the four Districts of Sikkim. The project shall meet the universal obligation to provide electricity to all consumers on demand and the rural areas shall be provided with quality and reliable power at par with the urban areas. 100% households shall be covered under this scheme. The project has the Code no. SK-01-0506.

1 Project Details

The project area spreads over the entire North District, which has the area of 4226 sq.km. As per census-2001 there are 53 villages out of which 45 villages are electrified as on 31^st March 2005. These leave 8 un-electrified virgin villages. All these villages can be connected through grid. However there are certain hamlets within these villages which can not be electrified through grid using conventional source of energy due to geographical remoteness and topographical difficulties and will be electrified through non conventional sources like solar energy. There are 290 hamlets within these 53 villages, out of which 200 are already electrified. This leaves 90 hamlets to be electrified. Only 65 hamlets has been taken under this schemes as those left out hamlets are either under the ARMY or GREF jurisdiction and some are far flung.

1.1 The project envisages usage of DTs of appropriate capacity which has been arrived at after taking into account the unutilized capacity of the existing DTs and also taking care to see that the existing DTs are within the prescribed loading limits. Depending upon the existing load condition and the number of new connections required, the transformers of 10 kVA or 25 kVA are proposed. Total capacity of DTs proposed is 840 KVA considering future load growth.

2 Existing system

2.1 The entire area of North District are fed from 2.5 MVA, 66/11 kV Sub station at Phodong, which is connected to the state grid through 66 kV lines originating at 2x50 MVA, 312/66 kV SubStation Melli. There are three power generating stations viz. Meyongchu (2x2 MW), Rabomchu (2x1.5 MW), Lachung (2x0.1) & Chaten (2x0.05 MW). Except Meyongchu all other hydel projects run in isolation catering to the local areas.

The North District has 4 nos. of 11 kV feeders. Max. Load varies between 1.5 to 3 MVA. A total of 78 nos. of 11kV spur lines shall be tapped at appropriate locations to construct 11kV lines for making supply arrangements to the designated virgin villages as well as the un-electrified hamlets. Two new 66/11 KV sub-stations are under construction and will be completed within six months. The voltage regulation will be maintained with the operation of these two 66/11 KV sub-stations at Mangan and Maltin. Three numbers of switching sub-stations, one each in Phensong,Namok and Hee-Gyathang have been included for proper reliability of power supply to the remote villages. The switching station will have quarter cum control room. The additional 39 km of 11 KV lines has not been included in the formats.

3 Modalities for implementation

􀂾 LT lines have been kept to the minimum to minimize line loss.

􀂾 Load balancing of lines by load re-arrangement is being planned for laying of majority of LT lines so and increased reliability is achieved.

3.2 The whole project is proposed to be executed on Turn-key Contract basis, for the purpose of providing better quality of work and equipment. Supply of Distribution Transformers will be kept as separate package to exercise direct control on the quality of the transformers. All the works for construction of HT/ LT lines will be on a turnkey package.

3.3 It is proposed to implement the project over a period of about one year. The proposed ‘Zero Date’ will be counted from the date of release of first installment of payment by REC.

5 Background

5.2 The status of village electrified as on 31^st March 2005 for the state of Sikkim as per 2001 Census.