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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