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PROPOSAL
FOR A MULTIPURPOSE PROJECT
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Out
of seven Major rivers in Tripura namely Howrah, Khowai, Dhalai, Manu,
Deo, Gumti and Muhari, only the
river KHOWAI
RIVER -The
second prospective proposal is on the river Khowai which could be tried
for gainful utilization. Incidently
an Irrigation barrage has already been constructed by the I&FC Deptt.
at Chakmaghat on Khowai river now in operation for couple of years. The
barrage has two irrigation cannel one on right bank and another on left
bank, having requirement of 80+75 =155 cusecs in total. However during
rainy season the gate of barrage are kept open since the high flow
discharge of Khowai in more than 60,000 cusec which cannot be hold by
the barrage as a result substantial quantum water flows
to Bay of Bengal through Bangladesh unutilized. For gainful utilization of the water of Khowai river, a multipurpose scheme for fishery, Duckery, Irrigation,(already existing partly) ,flood moderation and Power generation etc. could be thought for. In fact Central Water Commission (CWC) made a survey of all Major rivers in this area and in specific the Khowai River during mid 80’s.They proposed for a multipurpose project as stated above and Generation of power was a component of the total scheme. In
the report CWC proposed for construction of a rock-filled earthen dam at
3 Km upstream of the existing barrage at Chakmaghat on the river
Khowai.This will create a reservoir for storing the water of khowai
river at the upstream including the high flood discharge which will be
helpful for flood moderation at downstream at kalyanpur, khowai
etc.Apart from that such a large storage of 52,112 ha. meter would be
enough for fishery, duckery etc for the concerned Deptts. under Govt. of Tripura for
their development schemes for its gainful utilization. Power Generation: In the design part for power generation, CWC considered the tail water discharge level of the Hydel Power house 2 meter above the maximum pondage level of the barrage. The height of dam was kept purposely lower to minimize the submersion of paddy land, property submersion and eviction of people of neighboring localities. With these precautions, it is seen that a firm power of 3.90 MW only is available with the live storage of 47,862 ha.m. with average head of 32.85M and a regulated discharge of 15.18 cumecs from the river Khowai. Incase we go for 25% Load factor (LF) 15.61 MW power could be generated by 2x10 MW units during peak load Hours to supplement the shortage of peak power demand during evening i.e. from 5 Pm to 11 Pm every day. Alternately with 40% LF the power availability is 10 MW only which can be generated by 2X5 MW units. In addition, with the regulated tail water discharge of 15.18 cumecs (536 cusec), another Irrigation Barrage scheme at Kalyanpur at down stream of Chakmaghat seems feasible which will be an added benefit in Agri- Sector. Of
course CWC in their report has mentioned that about 779 families are to
resettled elsewhere for which cost shall be an in built component to the
project estimate. The present Peak demand of the State is 150MW (5PM to 10PM) and at off peak hour it reduces to 70MW in winter. This figure touches 160Mw in peak and 70-80 MW in off Peak hours in summer. Therefore the short fall is mostly during Peak- Load hours which can not be meet with own generation of the state but the off-peak demand could be meet with our own generation of 70MW now available, e.g. at Baramura 21 MW Rokhia 40MW and Gumti Project 8.5MW. Therefore the firm Power of 3.9MW as could be made available from the proposed Khowai DAM Project is less useful during off peak hours but if the same water could be utilized for 6 hours every day, i.e. from 5pm to 11PM Peak generation of 15-16MW in the evening helps substantially to reduce the peak power shortage. The
salient feature of
the scheme is reproduced below:-
TENTATIVE
SAILENT FEATURES OF THE proposed
KHOWAL DAM AT 3 KM UP STREAM OF CHAKMAGHAT BARRAGE. I.
Location State Tripura District Tripura (west) River Khowai Dam Site 9 k.m. upstream of Teliamura II. Hydrology Catchment area 500 sq. km. Normal annual rainfall 1,058 mm Dependable yield 90% 47,862 ha.m 75% 50,276 ha.m 50% 56,774 ha.m Design flood 1727 Cumces III.
Reservoir Gross storage 52,112 ha.m Live storage 47,862 ha.m IV. Dam Type Earthen dam Bed level 46.9 m Top of dam 90.0 m Height of dam 43.1 m Free board 3.2 m Average Head available 32.85 m V.
Spillway Type Saddle spillway VI.
Power Average water flow 15.18 cumece Output-Firm Power 3.90MW Peak power at 25% L.F. 15.61MW
T The scheme falls under Re-newable Energy Category as such Ministry of Non-conventional Energy Sources of Govt. of INDIA would like to provide the funds as 90% grant as Micro-Hydel Project for NE-Region. The estimated cost of generation is Rs 2.21 / KWHr.(approx) Which is reasonable with 2x10 MW Hydel unit .The annual energy generation will be around 35-40 million Unit( MU) (approx). Since no fuel is burnt it will not pollute the environment. By adding this peaking station of 2x10 MW capacities in the system, the state could have assured peak power assistance under his own control to meet the peak-short fall partly. It will save cost of import of power over Rs.9.00 cores per annuam considering average of cost of import @ Rs.2.5 /unit. This power could be utilized during emergency period when 132KVA line connection NE Grid is out of order or the external power is not temporarily available for some reason. Apart
from that by sale of power to be generated to our consumers, revenue of
equal amount could be collected to boost up our income for the Power
Deptt. SL No. DESCRIPTION AMOUNT 1 Total project cost of 2x10MW @ Rs.7.00/MW Rs.140core 2. Under MNES for Micro Hydels grant 90%on Rs.140core Rs 126 core 3. 10% Loan with interest on Rs.140core Rs.14.00core 4. Interest on loan @ 12 %on Rs 14.00core Rs.1.68 core 5. Depreciation @ 2.25% considering 40 years life of project on total 126 core keeping 10% reserve value Rs.2.84 core 6. Operation & Mtc.@ 2.5% i/c establishment on Rs 140 core Rs.3.50 core 7. Total annual fixed charge Adding (Sl no.4+5+6) Rs.8.02 core 8. Total unit available in Million Units 37.5 MU 9. Cost of generation at HT Bus Rs.2.14 10. Add 3.5 % profit Rs.0.07 11. Cost of salable power at HT Bus
Rs.2.21 per kwhr.*** In
case we go for 40% L.F. 2X5 MW units could be installed restricting the
peak power availability upto 10 MW only, with Rs, 70 cores as total cost
of the project. The cost of generation will be reduced substantially
with the reduction of plant size and investment as calculated below:- SL No. DESCRIPTION Amount 1
Total project cost of 2x5MW
@ Rs.7.00/MW Rs.70core 2. Under MNES for Micro Hydels grant 90%on Rs.70core Rs 63.00 core 3. 10% Loan with interest on Rs.70.0core Rs.7.00 core 4. Interest on loan @ 12 %on Rs 7.00core Rs.0.84 core 5. Depreciation @ 2.25% considering 40 years life of project on total 63 core keeping 10% reserve value Rs.1.42 core 7. Operation & Mtc.@ 2.5% i/c establishment on Rs 70 core Rs.1.75 core 7. Total annual fixed charge Adding (Sl no.4+5+6) Rs.4.01 core 8. Total unit available in Million Units 37.5 MU 9. Cost of generation at HT Bus Rs.1.068 10. Add 3.5 % profit Rs.0.0374 11. Cost
of salable power at HT Bus
Rs.1.17 per kwhr. *** ***
In case the cost creation of the RESERVOIR is shared
proportionately by I&FC, ARDD and FISHERY Depts. deriving benefit
from reservoir to be created the cost of generation of will be reduced
to a greater extent. The above summary of the scheme deserves consideration by the authority for detail investigation and study by the respective Deptts. for implementation for the multipurpose project on irrigation and flood moderation, fishery, duckery and power generation on the river KHOWAI for the development of the state. |
Gumti has been harnessed and a 2 ×5 MW Hydro Electric PowerStation
has been commissioned on the same during 1976 at Tirthamukh. A
concrete Dam was constructed at 2.5Km up stream of the Power House for
creating a reservoir of 45sq. Km. area (approx) which has also been
gainfully utilized by the Fishery Deptt. For fishy-culture. The Hydel
power station at Gumti is operating smoothly and 8.5 MW power is being
generated by two units, the 3rd one