Kenya constructed its first geothermal plant in 1981, the Olkaria 1. The East African nation has since built a fleet of other geothermal plants in Rift Valley steam fields, emerging as the eighth largest geothermal electricity producer in the world with an installed capacity of 770 megawatts (MW).
Slightly over three quarters of Kenya’s geothermal capacity is owned and operated by government-owned power producer KenGen.
KenGen’s installed geothermal capacity currently stands at 612MW, with the firm having more projects in the pipeline.
The company uses flash steam technology for its geothermal plants.
American firm Ormat is currently the only independent power producer (IPP) with geothermal plants in Kenya and holds the remaining 15 percent of Kenya’s geothermal power capacity. The IPP uses binary steam cycle technology for its plants. More exploration works are being undertaken by other IPPs such as Akiira Geothermal and African Geothermal International Ltd (AGIL), while Mauritius-based Quantum and Sosian Energy are in the development stage.
Here is the list of geothermal plants in Kenya
- Olkaria 1 Unit 1-3
Olkaria unit 1 to 3 is the first geothermal power plant constructed in Kenya at Olkaria fields, Naivasha over 35 years ago.
The power plant uses single-flash steam technology. Each unit of the plant has a capacity of 15MW, meaning the three units (1-3) have a total of 45MW.
The first unit was commissioned in 1981, followed by the second unit in 1982. The last unit came on board in 1985. The power plant is owned and operated by KenGen.
Olkaria 1 unit 1, constructed in 1981, was scheduled for decommissioning last year in 2019 but KenGen has decided to rehabilitate it, alongside the other two units whose decommissioning was due in 2019 and this year respectively.
- Olkaria 1 Unit 4-5 (Olkaria 1AU)
In 2014, two further units with a net capacity of 70MW each and manufactured by Japanese firm Toshiba were commissioned in Olkaria East. The power plant is owned and operated by KenGen.
- Olkaria 2
Olkaria 2 is also owned and operated by KenGen. The power plant has a capacity of 105MW.
It was commissioned in 2003 and is due for decommissioning in 2031, a lifespan of 28 years.
- Olkaria 3 Unit 1-6 (OrPower4 Steam I)
Olkaria 3 Unit 1-6 was commissioned in 2000 with installed contracted capacity of 48MW and is equipped with binary steam cycle technology. It’s due for decommissioning in 2029, a lifespan of 29 years.
The Olkaria 3 Unit 1-6 is owned and operated by the IPP OrPower4, a subsidiary of American firm Ormat Technologies Inc., and is the first private geothermal power plant in Kenya.
- Olkaria 3 Unit 7-9 (OrPower4 Steam II+III)
In 2013 and 2014 further 62MW geothermal power was put into operation by American firm Orpower4. The Olkaria 3 Unit 7-9 geothermal power plant is located next to Olkaria 3- Unit 1-6 in Olkaria. It is also equipped with a binary steam cycle technology and is due for decommissioning in 2034.
- Olkaria 4
Olkaria 4 was commissioned in 2014. It is Kenya’s largest geothermal power plant. It comprises two 70MW generating units manufactured by Toshiba. KenGen owns and operates the power plant.
- Olkaria 5
Belonging to KenGen, Olkaria 5 has a total installed capacity of 165.4MW. It has two units with Unit 1 (82.7MW) having been injected into the national grid in July 2019, with the remaining 82.7MW set to follow later this year.
The Eburru wellhead geothermal power plant was constructed by Civicon Ltd and is owned and operated by KenGen. It was commissioned in 2012. The power plant is located next to the Ol Doinyo Eburru Volcano, about 11km northeast of Lake Naivasha. It is equipped with single-flash steam cycle technology providing 2.2MW electricity to the national grid.
- Olkaria wellheads
KenGen operates several single flash steam wellheads in the Olkaria field. The first wellhead station was commissioned in 2012 and has a contracted effective capacity of 2.2 MW. More mobile wellheads were put into operation in 2014 with an effective capacity of 12.8MW. In 2015, additional wellheads were commissioned. Their net capacity is 37.8 MW. Additional 20MW was commissioned in 2016.
- OrPower wellhead 4
The wellhead geothermal power plant is owned and operated by the IPP OrPower 4 since its commissioning in 2015. The power plant is located in the Olkaria West sector. As typical for Orpower 4, it is equipped with binary standalone technology. The contracted capacity is 24MW.