Colenso Power Station was a
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
n coal-fired power station, located in
Colenso, KwaZulu-Natal
Colenso is a town in KwaZulu-Natal, South Africa. It is located on the southern bank of the Tugela River on the R103 road. The original settlement was contained within a loop on the river, but it subsequently expanded southwards and eastwards. ...
(
Uthukela District Municipality
uThukela is one of the 11 districts of the KwaZulu-Natal province of South Africa. The seat of uThukela is the city of Ladysmith. The majority of its 668,848 people speak IsiZulu (2011 Census). The district code is DC23.
Geography Neighbours
uT ...
) on the banks of the
Tugela River. It was built in the 1920s by the
South African Railways
Transnet Freight Rail is a South African rail transport company, formerly known as Spoornet. It was part of the South African Railways and Harbours Administration, a state-controlled organisation that employed hundreds of thousands of people ...
to supply electricity for the railways, and was subsequently sold to the Electricity Supply Commission (
Eskom
Eskom Hld SOC Ltd or Eskom is a South African electricity public utility. It was established in 1923 as the Electricity Supply Commission (ESCOM) and was also known by its Afrikaans name Elektrisiteitsvoorsieningskommissie (EVKOM). Eskom repre ...
).
History
Steep gradients on the Natal section of South African Railways, particularly in the Natal Midlands meant that electrification could be beneficial, particularly if
regenerative braking
Regenerative braking is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy into a form that can be either used immediately or stored until needed. In this mechanism, the electric traction mo ...
was employed. In 1921 the estimated cost of the electrification project, inclusive of the Power Station was .
Building started in 1921 and the power station was opened in 1926 with a capacity of 60 MW. Initially it only provided power for the 274 km section of the
Glencoe –
Pietermaritzburg
Pietermaritzburg (; Zulu: umGungundlovu) is the capital and second-largest city in the province of KwaZulu-Natal, South Africa. It was founded in 1838 and is currently governed by the Msunduzi Local Municipality. Its Zulu name umGungundlovu ...
part of the Durban-Johannesburg railway – the area that had the greatest gradients, and also the area that was closest to the coalfields of the Glencoe region. Power generated at Colenso was distributed at 88,000 volts to twelve substations where it was converted to 6,600 volts and then to 3,000 volts DC current by
synchronous motor
A synchronous electric motor is an AC electric motor in which, at steady state,
the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles. Sync ...
generators for use by the railways.
The power station was sold to the Electricity Supply Commission (
Eskom
Eskom Hld SOC Ltd or Eskom is a South African electricity public utility. It was established in 1923 as the Electricity Supply Commission (ESCOM) and was also known by its Afrikaans name Elektrisiteitsvoorsieningskommissie (EVKOM). Eskom repre ...
) in January 1927.
It used coal that was brought in by rail from the coalfields of North Natal and water from the Tugela. It continued to be the provider of electrical power for the railways which by 1937 consisted of the whole of the Natal section of the Durban – Johannesburg line (516 route km) and the 229 km spur to
Bethlehem
Bethlehem (; ar, بيت لحم ; he, בֵּית לֶחֶם '' '') is a city in the central West Bank, Palestine, about south of Jerusalem. Its population is approximately 25,000,Amara, 1999p. 18.Brynen, 2000p. 202. and it is the capital o ...
in the Orange Free State. Between 1944 and 1959 a series of new generators were commissioned, resulting in the power station's capacity being increased to 160 MW.
[ However, in the 1960s, changes in technology led to a change in the economics of power production. New power stations such as Ingagane were built at the coal fields themselves and the use 400 kVA power lines from 1972 onwards reduced the cost of transporting electricity. In the early 1980s Eskom initiated a major development programme: in 1980 new large power stations at Kriel (3,000 MW), Hendrina (2,000 MW) and Camden (1,600 MW) had been commissioned and in the next few years a number of other new power stations gave South Africa a surplus of generating capacity and many of the 1960s vintage power stations (including Colenso's refurbishment) had become uneconomic.
This meant that the continued use of the Colenso power station was no longer economically viable. The original part of the power station was decommissioned in 1970 and the 1944-1959 extensions in 1985.][
]
Present day
The power station's cooling towers remain standing to this day. In recent years a concerted effort has been in process to re-establish a new, larger, independent base load power station near the original site of the old Colenso power station. With a substantial coal resource discovered near the town and with the gradual liberalising of the South African electric power generation industry, a modern coal technology power generation unit is planned.
See also
References
{{Railway electrification
Coal-fired power stations in South Africa
Energy infrastructure completed in 1926
Former coal-fired power stations
Former power stations in South Africa
1926 establishments in South Africa
1984 disestablishments in South Africa
Buildings and structures in KwaZulu-Natal
Economy of KwaZulu-Natal
Uthukela District Municipality
20th-century architecture in South Africa