Quick Snapshot of the Hale Dam and Hydro Power Plant

Quick Snapshot of the Hale Dam and Hydro Power Plant

Tanzania’s Hale Dam is a hydroelectric dam located in Tanga. It has a total installed power of 28,000 horsepower [21 megawatts]. In order to build the dam, many people were forced out of their homes.

History of the Hale Dam

The Hale Dam has been the country’s oldest operational dam. Throughout Tanganyika’s colonial era, the Pangani river basin provided a source of electricity. The lower Pangani hydroelectric station was built by a German company in 1936 at Pangani Falls. The government decided to create a new power station in Hale because of the booming Tanga district and its closeness to Mombasa Region.

Investments totaling $5,000,000 were made in the country for the first time since a groundnut scheme that went sour.

The Hale Dam power station became fully functional in November 1964.

Hale Dam Hydro Power Plant

Some Forty river miles from the Indian Ocean, the Hale Dam hydroelectric Power station harnesses a natural 70-meter fall. It lies 6 kilometers from the Tanga-Moshi intersection at Segera, in Hale Township, just on the Segera-Tanga route.

Four kilometers upstream of the deviation intake weir, the hydro works comprise a storage weir from across the Pangani River. An intake weir and a vertical drop beam connect to a headrace tunnel, from which a surge shaft and a high-pressure rod and tunnel carry water to the turbines at a 76-meter-deep underground power plant. A tailrace tunnel and an open canal are used to restore water to the river. The 21 Megawatt underground power plant is built in a rock cavern 30 meters long and 12 meters broad, with an excavated ceiling height of 24 meters.

Pangani river basin
Pangani river basin

Francis turbines and salient pole generators are used to generate power in two vertical components.

An elevator, stairs, and cable and piping storage room are all located in a 6-meter-diameter shaft that leads to the station. Special drainage features have been incorporated into the concrete spraying of the post. An access tunnel is in the works for the station.

A substantial renovation of the Hale Dam Plant is scheduled for the year 2009. For the Plant’s operation and maintenance employees, the Project’s goal is to improve the Plant’s overall operating safety and reliability. It will also lengthen the Plant’s life and help avoid a power generating shortage in the country, which will benefit from the Project. In 1987, the last restoration work was completed.

Hale Dam Main Data

Reservoir Units Storage Weir Intake Weir
Total Storage Capacity Cubic meter by 10 1.9 0.1
Design Flood Cumecs 255 600
Live Storage Capacity Cubic meter by 10 1.1 0.1
Catchments area Km2 42,200 4,200
Probable Maximum Flood Cumecs 990 990
Rock and Earth Fill, Volume Cubic meter 9,750 18,728
Spillwier, Concrete Volume Cubic meter 1,190 2,140
                                             POWER PLANT
Capacity 21 Megawatts
Yearly Output 91 Gigawatts
Design Head 70 Metre
Generators 2 by 12.350 MVA
Headrace and Tailrace Tunnels 2050 metre
Turbines 2 by 10.5 Vertical Francis
Powerhouse 9000 cubic meter rock excavation [quartz gneiss]
Inauguration 1964
Construction Start 1961
Transmission Lines 132kV 160km to Chalinze

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