Guyana Energy Agency

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Hydro

The following is a summary of 67 potential hydropower sites in Guyana.

The following is a list of hydropower studies available at the resource centre of the Guyana Energy Agency.

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Sites under current consideration are summarized below.

Eclipse Falls, Region 1
Studies have estimated the potential capacity at Eclipse Falls as 4 MW. All data relating to this site is currently being updated under the Unserved Areas Electrification Program.

Summary Data of the Pre-feasibility Study

Catchment Area 2,437 km²
Maximum Reservoir level 27.67 m
Full supply level 26.0 m
Low supply level 22.0 m
Live storage 145 X 106 m3
Dead storage 45 X 106 m3
Total storage 190 X 106 m3
Area at fsl 52 km²
Average runoff 870 m³/s
Design flood 950 m³/s
Tailwater level at average runoff 20.75

Dam

  • Type
earthfill and concrete
  • Height
711.75 m
  • Length of concrete
188 m
  • Total length of dam
898.75 m
  • Crest elevation
30.60 m
  • Crest width
7.0 m

Turbines

  • Effect
3 X 100 kW
  • Rated head
7.0 m
  • Unit discharge
19.0 m³/s
  • Speed
180 rpm
  • Generators
1250 kVA
  • Power factor
0.8
  • Annual firm energy output
14.19 GWh

Transmission Line

  • Length to Matthews Ridge
34 km
  • Length to Port Kaituma
37 km
  • Total length
71 km
  • Voltage
22 kV
  • Rated frequency
60 Hz

Turtruba, Region 7
The initial estimate of the potential installed capacity for this site was 320 MW, but the study carried out by the developers, Enman Services Ltd., has estimated an average power output of 760 MW with optimization of the dams. An MOU was signed with the developers in 2001.
This project would require the construction of an access road and transmission lines. It is envisaged that power would be available within 6-8 years of construction.

The potential power to be produced is intended for export from Guyana to Brazil and in the future as a Phase 2 project to Trinidad & Tobago.

Summary Data of the Initial Feasibility Study

Reservoir

  • Total storage
18.5 MAF (million acre-feet)
  • Live storage
11.8 MAF
  • Full supply level (FSL)
195 ft
  • Low supply level (LSL)
140 ft
  • Normal tail water level (TWL)
20ft

Earthfill

  • Height
195 ft
  • Length
13,000 ft
  • Total volume
30,112,00 cu yd

Spillway

  • Volume concrete (including transitions)
593,000 cu yd
  • Height
245 ft
  • Length
275 ft
  • Radical gates
4 -50 ft X 65 ft high
  • Discharge capacity
11,325 m³/s

Power Station

  • Rock elevation
300,000 cu yd
  • Volume concrete
635,000 cu yd
  • Length
936 ft
Turbines 10 X 110 MW (Francis)
Generators 10 X 122,000 KVA at 0.9 pf and 100rpm
Transmission 2,345 KV circuits to Linden
Average net head developed for Energy 163 ft
Minimum net head developed for Power 130 ft
Reservoir drawdown 65 ft
Plant capacity at maximum head 1100 MW
Plant capacity at average head 918 MW
Plant capacity at minimum head 650 MW
Firm energy (dependable) 487 MW
Average energy 760 MW

Devil’s Hole, Region 7
An MOU was signed in February 2007 with Guyana Goldfields Inc. for a period of two years to conduct a feasibility study. This site has a proposed continuous energy of 62 MW but, is initially intended to supply 35 MW of electricity to its mining site at Aurora.

Arisaru, Region 7
Government of Guyana and the Guyana Poverty Alleviation Group signed a Memorandum of Understanding in August 2003 to study the Arisaru site. This MOU was for a period of two years which has since expired. This site has a potential of 120 MW.

Upper Mazaruni, Region 7
RUSAL, a Russian Company was granted exclusive rights in February 2007 for an initial period of three years to conduct a pre-feasibility study of this site. This site has a potential installed capacity of 1320MW and the Company is proposing to set up an Aluminum Smelter as the primary load centre.

Based on previous studies, the following key parameters of the Upper Mazaruni Hydropower Station were identified in the RUSAL report

Summary Data

  • Reservoir
    • Catchment area 10,890 km²
    • Normal annual runoff 20.2 km³
    • Normal annual discharge 640 m³/s
    • Maximum discharge 2,400 m³/s
    • NMOL 498.5 m
    • Dead-storage level 483.0 m
    • Evacuation depth 15.5 m
    • Total storage capacity 15.0 km³
    • Active storage capacity 13.8 km³
  • Dam
    • Site Sand Landing
    • Foundation sand-rock and apogrit
    • Height 55.0 m
    • Crest length 240.m
    • Quantity of fill 625,000 m³
  • Weir
    • Location on the right bank of reservoir
    • Foundation sand-rock and apogrit
    • Discharge capacity 5,000 m³/s
    • Number of bays 4
  • HPS intake chamber
    • Location on the left bank of Mazaruni River
    • Number of bays 2
    • Foundation sand-rock and apogrit
    • Design discharge 600 m³/s
  • Diversion tunnel
    • Geological surrounding sand-rock and glomeration
    • Length 11.4 km
    • Diameter 10.0 m
  • Station sluices
    • Geological surrounding sand-rock
    • Length 2.3 km
    • Diameter 3.0 m
  • HPS Powerhouse
    • Type underground
    • Geological surrounding diabase
    • Design discharge 600 m³/s
    • Number of units depends on option (12 X 183.3 MW; 4 X 550 MW; 6 X 367 MW)
  • Turbine type radial-axial (Francis turbines)
  • Maximum head 430 m
  • Tailrace conduits
    • Type trough-shaped two-line with re-inforced concrete lining 0.25 m thick
    • Geological surrounding diabase and sand-rock
    • Length 1.6 km
    • Diameter 10.0 m

Tumatumari, Region 8

The Tumatumari Hydropower Station was the first hydropower station to be constructed on the Potaro River, Region 8. The plant was constructed in 1957 by the British Goldfields Limited and operated until 1959 when the mining operations were ceased. In 1969, the Government of Guyana re-commissioned the station where the power was transmitted to serve the Guyana National Service Camps at Tumatumari and Konowaruk. The development included an embankment dam, a concrete overflow dam, and a 2-unit powerhouse with an installed capacity of 1500 kW using (2 X 750 kW Francis turbines).

THI and Hydro Quebec International signed a Memorandum of Understanding for the development of this Hydro station and are currently looking for a Developer to complete final works. Several MOUs were signed with various companies for the development of the Tumatumari Hydropower Project. However, all have since expired.

Summary Data

  • Catchment area 3,160 km²
  • Average discharge 480 m³/s
  • Head 14 m
  • Installed capacity 46.5 MW
  • Estimated Annual generation 276 GWh
  • Designed flood 3,740 m³/s
  • Dam type concrete gravity
  • Transmission line 100 km (Linden/Georgetown)
  • Transmission voltage 13.8 kV
  • New access road 75 km
  • Turbines 8 Kaplan, S type units (Pelton)

Amaila, Region 8
The Amaila Hydroelectric project is being developed by Synergy Holdings Inc. The Feasibility study and the Environmental Impact Assessment have been completed. The feasibility study was completed in 2001 and then an Interim License was granted in July 2002 for two years and was subsequently renewed until July 2007. The Developer was granted a License to develop the project and is now in the process of securing financing for closure of the project. It is envisaged that this hydroelectric station will be commissioned by 2012. The Amaila hydroelectric station is conceived as a high head diversion scheme run of the river project. The potential installed capacity was initially estimated as 103MW.

Summary Data

  • Reservoir
    • FSL 462.0 m
    • LSL 452.5 m
    • Spillway crest level 453.0 m
    • Maximum flood surcharge level 464.8 m
    • Active storage volume 146 mcm
    • Surface are at fsl 26.7 km²
  • Dams

- Kuribrong Dam

    • Type concrete faced rockfill dam
    • Crest elevation 465.5 m
    • Crest width 8.0 m
  • Amaila Dam
    • Type concrete faced rockfill dam
    • Crest elevation 465.5 m
    • Crest width 8.0 m
  • Spillway
    • Type gated
    • No. of gates 3
    • Design surcharge (routed PMF) 2.8 m
    • Capacity at design discharge 2,420 m³/s
  • Penstock
    • Length 1,050 m
    • Average diameter 2.75m
    • Area 5.9 m
    • Design flow 33.5 m³/s
    • Velocity at design flow 5.6 m/s
    • Type surface steel penstock
  • Powerhouse
    • Type surface
    • Number of units 4
    • Type Francis
    • Nominal power output, each unit 25 MW
    • Nominal discharge, each unit 8.38 m³/s
    • Gross head (maximum) 365 m
  • Access Road
    • Length 40.6 km
    • Origin Pamela Landing
  • Transmission line
    • Length 296 km
    • Type 230 kV, double circuit, single tower
    • Termination Sophia

Kato, Region 8
Under the Unserved Areas Electrification Programme, the Hinterland Electrification component, Government of Guyana is currently seeking funding to conduct a feasibility study for the Kato site which has a potential of 3 MW.

Below is a map depicting the location of potential hydropower sites in Guyana.


Click Image to enlarge