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Snostskali HPP www.energy.gov.ge

Snostskali HPP

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Page 1: Snostskali HPP

Snostskali HPP

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Page 2: Snostskali HPP

Snostskali HPP is located in Mtskheta-Mtianeti region, Kazbegi Municipality, settlement Stepantsminda

Snostskali HPP

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Page 3: Snostskali HPP

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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Page 4: Snostskali HPP

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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Page 5: Snostskali HPP

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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Page 6: Snostskali HPP

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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Page 7: Snostskali HPP

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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Page 8: Snostskali HPP

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

Page 9: Snostskali HPP

Number of observed years - 51

Chosen Year - 1985

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Page 10: Snostskali HPP

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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

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

18.00

GW

H

ჰვტ

/სთ

Generation, 50 % Provision

გენერაცია, 50 % უზრუნველყოფა

Page 11: Snostskali HPP

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