INVENTORY STUDY ON DEVELOPMENT POTENTIAL FOR RURAL ELECTRIFICATION IN ISLAND -

MAMBA Nusa Tenggara Timur

Kupang, November,2002

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Mamba – Wangkar Weli

1. GENERAL INFORMATION Province : Nusa Tenggara Timur Regency : Manggarai District : Pocoranaka Village : Wangkar Weli Site / Sub-village : Mamba River : Wae Nunung Gross Head : 72 m Estimate Design Discharge: 210 l/s Hydraulic Potential Power : 148.33 kW Estimate Electrical Power : 100.94 kW Catchments area : 9.23 km2

2. SITE DESCRIPTION 2.1. Location 2.3. Topographic and Geological Condition Mamba sub-villages is one of the potential site for a Micro Hydropower The MHP scheme will use water from Wae (MHP) implementation. Mamba Sub- Nunung River. The river located on the villages is a part of Wangkar Weli, South of Mamba sub-villages. From the Pocoranaka district, Manggarai MHP scheme (power house location) the regency, Nusa Tenggara Timur river goes to the north direction. province. It is located geographically at Topographic conditions along the river are S 080 33’ 16” and E 1200 38’ 39”. moderate slope, while the soil condition in Wangkar Weli village north border is waterway is loose. And the materials Rengkam village, Rendenao district at around the river are gravel and loose soil. the southern side, Tango Molas district There is a separate channel (waterway) in at the western side and Ngkiong Dora the middle part of head race, and also a village at the eastern side. split stream on the intake scheme (it is recommended to make a further measurement here, to adapt this condition).

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Table 1. Route of Access Line Available Layer (road) Route Distance Duration Transportation Type – Pocoranaka 13 km 30 minutes Bus Asphalt Pocoranaka - Wangkar Weli 27 km 120 minutes Rented car Asphalt, Grave Wangkar Weli – Mamba 0,2 km 10 minutes - soil (MHP scheme location)

2.2. Accessibility

Mamba sub-villages located about 40 km to the east of Ruteng, Manggarai regency, Nusa Tenggara Timur province. The location could be reach by four wheel vehicle such Kijang or motorcycle for about 3 hour from Ruteng, or by a public transportation (buses, rented car) which service route among Ruteng and Pocoranaka - Wangkar Weli village. From Wangkar Weli, Mamba the MHP scheme location (power house) could be reached by walk in ± 10 minutes. (see Table 1.)

3. SOCIO – ECONOMIC CONDITION

Village settlements in Wangkar Weli According to the agriculture potential in village are spread not concentrated. the area, Mamba sub-village is quite There is an adequate distance prospective to develop further. There are between every small group from one existing public facilities such as to another. Almost the villagers are elementary school, church, public health farmers. Their main crops are coffee, center, and village government office. chocolate, and passion fruit. They There are also community organization still cultivate their land in traditional such as LKMD, Farmer groups, and way, without any modern agriculture religious groups. know-how.

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4. POTENTIAL ENERGY SOURCES AND ELECTRIFICATION CONDITION

The villages around MHP scheme has The numbers of household that not been electrified and will not get will electrify by MHP scheme at electricity from PLN grid, at least in the Wangkar Weli village are ±381 recent PLN plan. The nearest PLN household. Based on empiric data of electricity grid is about 15 km. Existing electrification project using MHP, the main energy sources for villagers there estimate electricity need or electrical are kerosene, and oil for lighting. power need assumption is about 150 The village around MHP scheme watt per house. Including the economically has many potential, electricity need to several public especially in agriculture, horticulture, facilities, than total MHP Capacity and forestry sectors. However, related expected for Wangkar Weli villages is production facilities are still insufficient, about 59.08 kW. there are some possibilities such as; sawmill, rice mill, and coffee grinding. MHP development is expected giving valuable support to increase community economics quality apart from lighting need.

Catchment Area of Wae Nunung River (Wangkar Weli)

Table 2. Sub-Villages which will electrified by the MHP Scheme

Number of Sub-Village Village Latitude Line Longitude Line Household Mamaba Wangkar Weli 33 Pos Wangkar Weli 55 Jawa Wangkar Weli 60 Well Wangkar Weli 33 Ngkiong Dora 200 Total 381

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Table 3. Estimate Energy Demand in The Catchment Area

Capacity per Item Amount Capacity Remark Unit Households 381 150 W 57,15 kW - School 1 150 W 0,15 kW Elementary School Church 1 150 W 0,15 kW Public Health Center 1 150 W 0,15 kW Village Office 1 150 W 0,15 kW Meeting Facility Public Facility 2,00 kW (Streed Lighting) Total 59,08 kW

5. HYDRO – POWER POTENTIAL According to topographic Wae Nunung River is ± 350 measurement , water from Wae liter/second. Recorded discharge data Nunung river will be flow through or annual discharge are not available intake than to headrace which the and discharge measurement done length is about 300 m . For this MHP not in the driest month,therefore scheme, measured gross head is about maximum discharge in the dry 72 m and estimate penstock length is season estimate about 210 l/s. abouth 200 m. However, design discharge has to be Estimate minimum power electricity determined in detail and more need in Wangkar Weli village and it is accurate, considering all factor, and surrounding is about 59,08 kW. To catchment area when a further fulfill this requirement, the future MHP feasibility study for this MHP done. discharge have to be about 210 l/s with the estimate net head 70 m, with 6. TRANSMISSION LINE this calculation the MHP scheme could generate electricity power about The village settlement surrounding 95,9 kW and still have reserved power the MHP scheme is spread and in about 36,82 kW (see detail calculation small group which have significant distance from each other. Main transmission line to house sub- villages, as shown in Table 2, is about 8 km length.

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Table 4. Estimate Power Capacity of The MHP Scheme

Item Symbol Amount Estimate Gross Head Hg 72 m Measured Discharge (when survey) Qm 350.00 l/s Design Discharge (max 60 % frm Qm) Qd 210.00 l/s Hydrolic Power Potential Ph 148.33 kW Estmate Net Head Hnet 70 m Estimate Turbine Efficiency ηT 0.7 Estimate Generator Efficiency ηG 0.85 Estimate mechanical transmission line efficiency ηM 0.97 Estimate Electrical Power Generated at the power house P el1 100.94 kW Estimate transmission Losses Ploss 5.05 kW Estmate Electrical Power delivered to the village P el2 95.90 kW Expected MHP Capacity (refers table 3) P exp 59.08 kW Reserved Power (Pel2 - Pel1) P res 36.82 kW

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