Snostskali HPP
Transcript of Snostskali HPP
Snostskali HPP
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Snostskali HPP is located in Mtskheta-Mtianeti region, Kazbegi Municipality, settlement Stepantsminda
Snostskali HPP
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Installed Capacity – 22.2 MW
Average Annual Generation – 114.43 GW/h
Regulation Type – Run-off-the-river
Capacity Usage Ratio – 53.9 %
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Construction Cost – 37.8 million USD
Construction Period – 3 years
Domestic Tariff – 4.8 USc/kWh
Export Tariff – 8 USc/kWh
Project IRR – 14%
Project NPV – 13.4 million USD
Equity IRR – 21%
Equity NPV – 15 million USD
Payback Period – 10 years
Note: All the calculations are based on preliminary
assumptions. Therefore any clarifications will
cause appropriate changes in the final results.
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Site Location: - Mtskheta-Mtianeti region, Kazbegi Municipality, settlement Stepantsminda
- Name of the River: Tergi
- GPS Coordinates: X=470216 Y=4722851
HPP Type: Diversion, Run-off-the-river
Site Description: The hydropower plant consists of one headwork, diversion pressure tunnel, power conduit, powerhouse, tailrace.
The headwork consists of low-threshold spillway dam with height 10m, ensuring conduction of the maximal water discharge, reinforced concrete water intake and settling basin with washer. The diversion is presented by the pressure tunnel with 3.5m diameter and 9.6km length.
At the end of the diversion reinforced concrete stilling basin, with diameter 7.0m, is arranged. The power conduit is 2.0m diameter metal lined tunnel. The powerhouse is a underground structure with areal size 19X52m and height – 45.0m. The tailrace tunnel is a trapezoidal cross-section reinforced concrete building in dimensions 4.0mX4.0m and 230m length.
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Technical Parameters
Installed Capacity MW 22.2
Average Annual output GWh 114.43
Autumn-winter (Oct-March) generation GWh 24.68
Capacity usage ratio/Efficiency % 53.9
Type of regulation Run-off-the-river
Scheme of energetic usage potential Full
Hydrology
Hydrological Data (number of years) Year 51
Year of the average multi annual discharge Year 1985
Catchment area km2 415.42
High water flow m3/sec 15.21
Average water flow m3/sec 13.03
Low water flow m3/sec 10.8
PMF (1%) m3/sec 399
Rated water discharge m3/sec 18
Maximum gross head m 145
Minimum gross head m 136
Reservoir
Full supply level (FSL) masl 1865
Minimum Operation level (MOL) masl Unnecessary
Total volume at FSL mln. m3 Unnecessary
Active reservoir level mln. m3 Unnecessary
Dam
Type Low threshold
Crest Elevation masl 1865
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Spillway
Type Surface
Crest Elevation masl 1865.1
Length of spillway crest m 180
Reservoir elevation during PMF masl 1867.5
Spillway capacity at reservoir level PMF m3/sec 399
Water intake
Sill elevation masl 1859
Stop log type and number Flat Surface
Quantity unit 1
Sluice or bottom spillway
Type and number Ground
Quantity unit 1
Dimensions (w x h) or (d) m 2.5x2.5
Diversion
Type of diversion Tunnel
Dimensions (w; l) or (d; l) m 3.2; 9620
Stilling basin or shaft
Dimensions (w x l) or (d ) m 7
Powerhouse
Type Underground
Dimensions (w x h x l) m 19x45x52
Elevation of tailrace outlet sill masl 1723
Tailrace
Type Tunnel
Dimensions (w x h) m 4.0x4.0
Elevation of outlet sill masl 1720
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Turbines/Generators
Turbine Type and number F. MLD 46-LI-120; 2
Rated discharge m3/sec 9
Rated output MW 11.45
Maximum output MW 12.72
Generator Type SF 12.5 – 10/2860
Generator nominal output MW 11.05
Generator nominal output rpm 600/1223
Transformers
Type Three phase
Number unit 2
Nominal power MVA 12.27
Transformer dimensions (l x w x h) m 5,8x3,5x5,3
Seismic background of the construction site
Richter scale Magnitude 7.0
Economic and Financial Parameters
Costing mln. USD 37.8
Duration of the construction Year 3
Investment per 1 kV Thousand USD 1.7
Investment per 1 kV/h USD 0.33
Revenue per USD spent (Average price new HPP - 4,8 cents) USD 0.15
Estimated carbon credit generation T. 40.4
Social and Environmental Parameters
Special environmental requirements
Social Impact Additional workplace; Development of infrastructure
Ecological risks Low
Transmission lines
Parameters kV 35
Distance to inter connection point km 1.5
Infrastructure
Existing roads Paved
Roads to be constructed km 1.5 www.energy.gov.ge
Number of observed years - 51
Chosen Year - 1985
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I II III IV V VI VII VIII IX X XI XI
Series1 3.06 2.76 2.98 6.58 16.50 15.97 16.50 13.12 8.24 5.51 4.40 3.57
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GW
H
ჰვტ
/სთ
Generation, 50 % Provision
გენერაცია, 50 % უზრუნველყოფა
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