Cheshura HPP
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Cheshura HPP www.energy.gov.ge
Transcript of Cheshura HPP
Cheshura HPP
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Cheshura HPP is located in Racha - Lechkhumi and Kvemo Svaneti region, Oni
district, village Gona on the river Chashuri.
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Installed Capacity - 7.50 MW
Average Annual Generation – 32.40 GW/h
Regulation Type – Run-off-the-river
Capacity Usage Ratio – 49.32%
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Construction Cost – 11.25 million USD
Construction Period – 2 years
Domestic Tariff – 4.8 USc/kWh
Export Tariff – 8 USc/kWh
Project IRR – 15%
Project NPV – 3.88 million USD
Equity IRR – 23%
Equity NPV – 4.24 million USD
Payback Period – 9 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: - Racha-Lechkhumi and Kvemo Svaneti region, Oni district, village Gona
- Name of the River: Chashuri
- GPS Coordinates: X=381137 Y=4737406
HPP Type: Diversion, Run-off-the-river
Site Description: Head unit, diversion pressure pipeline, surge tank, turbine conduit, power house, tailrace channel.
Head unit conveys Tyrolean weir, height - 5.0m, which ensures maximum water discharge, reinforced concrete water intake and silt basin with sluice. Diversion is a pressure pipeline, diameter - 1.4m, length - 4.6km.
At the end of the diversion there is a metal surge tank, dimensions - 4.0x18.0m. Turbine conduit is represented by 1.2m diameter metal pipe. Power house dimensions - 12.0x24.0m, height - 18.0m. Tailrace channel is rectangular reinforced concrete construction, dimensions - 1.5x1.5m, length - 120.0m.
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Technical Parameters
Installed Capacity MW 7.50
Average Annual output GWh 32.40
Autumn-winter (Oct-March) generation GWh 5.23
Capacity usage ratio/Efficiency % 49.32
Type of regulation Run-off-the-river
Scheme of energetic usage potential Partial
Hydrology
Hydrological Data (number of years) Year 24
Year of the average multi annual discharge Year 1975
Catchment area km2 48.20
High water flow m3/sec 2.82
Average water flow m3/sec 2.15
Low water flow m3/sec 1.66
PMF (1%) m3/sec 86.00
Rated water discharge m3/sec 3.60
Maximum gross head m 247.40
Minimum gross head m 230.50
Reservoir
Full supply level (FSL) masl 1800.00
Minimum Operation level (MOL) masl Unnecessary
Total volume at FSL mln. m3 Unnecessary
Active reservoir level mln. m3 Unnecessary
Dam
Type Tyrol
Crest Elevation masl 1799.60
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Spillway
Type Unnecessary
Crest Elevation masl Unnecessary
Length of spillway crest m Unnecessary
Reservoir elevation during PMF masl 1801.50
Spillway capacity at reservoir level PMF m3/sec 86.00
Water intake
Sill elevation masl 1797.00
Stop log type and number Flat surface
Quantity unit 1
Sluice or bottom spillway
Type and number Unnecessary
Quantity unit Unnecessary
Dimensions (w x h) or (d) m Unnecessary
Diversion
Type of diversion Conduit
Dimensions (w; l) or (d; l) m 1,4; 4600
Stilling basin or shaft
Dimensions (w x l) or (d ) m 4x18
Powerhouse
Type Above-ground
Dimensions (w x h x l) m 12x18x24
Elevation of tailrace outlet sill masl 1555.00
Tailrace
Type Covered channel
Dimensions (w x h) m 1,5x1,5
Elevation of outlet sill masl 1550.80
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Turbines/Generators
Turbine Type and number F. HLA 179-WJ-71; 2
Rated discharge m3/sec 1.80
Rated output MW 3.89
Maximum output MW 4.32
Generator Type SF 4000-8/1430-1730
Generator nominal output MW 3.75
Generator nominal output rpm 1500
Transformers
Type Three-phase
Number unit 2
Nominal power MVA 4.2
Transformer dimensions (l x w x h) m 5,8x3,5x5,3
Seismic background of the construction site
Richter scale Magnitude 6.7
Economic - Financial Parameters
Costing mln. USD 11.25
Duration of the construction Year 2.00
Investment per 1 kV Thousand USD 1.50
Investment per 1 kV/h USD 0.35
Revenue per USD spent (Average price new HPP - 4,8 cents) USD 0.15
Estimated carbon credit generation T. 11.3
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 5.00
Infrastructure
Existing roads Gravel
Roads to be constructed km 0.50 www.energy.gov.ge
Number of observed years – 24
Chosen Year - 1975
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