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Bakhvi 1 HPP
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Bakhvi 1 HPP is located in Guria region, Ozurgeti district, village Bakhmaro.
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Installed Capacity - 15 MW
Average Annual Generation – 78.2 GW/h
Regulation Type – Reservoir
Capacity Usage Ratio – 59.5 %
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Construction Cost – 27 million USD
Construction Period – 3 years
Domestic Tariff – 4.8 USc/kWh
Export Tariff – 8 USc/kWh
Estimated carbon credit generation – 27.4 thousand tones
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: - Guria region, Ozurgeti district, village Bakhmaro
- Name of the River: Bakhvistskali
- GPS Coordinates: X=272064 Y=4639201
HPP Type: Diversion, Reservoir
Site Description: Head unit, diversion pressure tunnel, surge tank, turbine conduit, power cavern, tailrace tunnel.
Head unit conveys fill dam, height - 57.5m, which ensures maximum water discharge, reinforced concrete water intake. Diversion is represented by pressure tunnel, diameter - 2.0m, length - 3.1km.
Reinforced concrete surge tank is located at the end of the diversion, diameter - 4.0m. Turbine conduit is 2.0m diameter metal faced tunnel. Power cavern dimensions 19.0x52.0m, height - 45.0m. Tailrace tunnel is a reinforced concrete trapezoidal construction, dimensions 2.0x2.0m, length 300.0m.
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Technical Parameters
Installed Capacity MW 15.00
Average Annual output GWh 78.24
Autumn-winter (Oct-March) generation GWh 33.88
Capacity usage ratio/Efficiency % 59.54
Type of regulation Reservoir
Scheme of energetic usage potential Full
Hydrology
Hydrological Data (number of years) Year 32
Year of the average multi annual discharge Year 1950
Catchment area km2 52.00
High water flow m3/sec 5.20
Average water flow m3/sec 2.90
Low water flow m3/sec 1.68
PMF (1%) m3/sec 142.00
Rated water discharge m3/sec 3.90
Maximum gross head m 460.00
Minimum gross head m 423.00
Reservoir
Full supply level (FSL) masl 1800.00
Minimum Operation level (MOL) masl 1763.00
Total volume at FSL mln. m3 22.00
Active reservoir level mln. m3 18.00
Dam
Type Rock fill
Crest Elevation masl 1801.50
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Spillway
Type Surface
Crest Elevation masl 1800.10
Length of spillway crest m 25.00
Reservoir elevation during PMF masl 1801.50
Spillway capacity at reservoir level PMF m3/sec 71
Water intake
Sill elevation masl 1765.50
Stop log type and number Butterfly valve
Quantity unit 1
Sluice or bottom spillway
Type and number Tunnel
Quantity unit 1
Dimensions (w x h) or (d) m 3.0
Diversion
Type of diversion Tunnel
Dimensions (w; l) or (d; l) m 2.0; 3100
Stilling basin or shaft
Dimensions (w x l) or (d ) m 4.0
Powerhouse
Type Underground
Dimensions (w x h x l) m 19x45x52
Elevation of tailrace outlet sill masl 1337.00
Tailrace
Type Tunnel
Dimensions (w x h) m 2x2
Elevation of outlet sill masl 1338.50
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Turbines/Generators
Turbine Type and number P. CJ 20-L-140/2x11.5; 3
Rated discharge m3/sec 1.30
Rated output MW 5.18
Maximum output MW 5.76
Generator Type SFW 5000-8/2860
Generator nominal output MW 5.0
Generator nominal output rpm 500/750
Transformers
Type Three-phase
Number unit 3
Nominal power MVA 5.6
Transformer dimensions (l x w x h) m 4.5x3.15x4.8
Seismic background of the construction site
Richter scale Magnitude 6.0
Economic - Financial Parameters
Costing mln. USD 27.00
Duration of the construction Year 3.00
Investment per 1 kV Thousand USD 1.80
Investment per 1 kV/h USD 0.35
Revenue per USD spent (Average price new HPP - 4,8 cents) USD 0.16
Estimated carbon credit generation T. 27.4
Social and Environmental Parameters
Special environmental requirements
Social Impact Additional workplace; Development of infrastructure
Ecological risks Medium
Transmission lines
Parameters kV 35
Distance to inter connection point km 8.00
Infrastructure
Existing roads Earth
Roads to be constructed km 7.00
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Number of observed years – 32
Chosen Year - 1950
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