Olkaria I Power Station was the first geothermal power plant in Africa. The 45 MW plant was commissioned in three phases and has three units each generating 15MW of electricity. The first unit was commissioned in June 1981, the second and third units in November 1982 and March 1985, respectively.
To date, a total of 33 wells have been drilled for the station. Thirty-one of these are currently connected to the power station while two of these are retired. One well is currently being used for hot-injection. The turbines are direct condensing 4-stage running with an inlet steam pressure of 5 bars at temperatures of 152oC and steam consumption of 9.2 t/h/MW. The plant has had an average availability factor of over 95 per cent from commissioning. The power generated is connected to the national grid via a 132KV-transmission line.
Olkaria II Power Station
Olkaria II Power Station is Africa?s largest Geothermal Power Station. It generates 70MW and is the second geothermal plant owned and operated by KenGen.
The second phase of Olkaria || was commissioned in 2010 injecting an extra 35 MW of power making a total of 150MW of power produced through geothermal means.
The Power Station is located in the North Eastern sector of the greater Olkaria geothermal field. Wells were drilled between 1986 and 1993 but construction of the power plant was delayed until the year 2000 when funds became available. The project was co-financed by the World Bank, the European Investment Bank, KfW of Germany and KenGen. Designed and constructed with an advantage of newer technology, this state-of-the-art plant is highly efficient in steam utilization. It works on single flash plant cycle with a steam consumption of 7.5 t/h/MW. The turbines are single flow six stage condensing with direct contact spray jet condenser.
The power generated is transmitted to the national grid via 220 kv double circuit line.
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