[7] The Olkaria I Power Station first started operation in 1981 running one Mitsubishi turbine with a generation capacity of 15MW.

[2] In March 2016, the government of Kenya borrowed KSh9.53 billion (US$95 million), from the Japan International Cooperation Agency (JICA) to refurbish turbines 1, 2 and 3 at Olkaria I.

[10] In December 2018, Kenya Electricity Generating Company broke ground for the construction of Unit 6 of Olkaria I Geothermal Power Station, with capacity of 83 megawatts.

Completion of this unit was expected in 2021, bringing total capacity at this geothermal station to 268.3 megawatts (359,800 hp).

[1] Olkaria I Power Station is owned by KenGen, a Nairobi Stock Exchange - listed company, in which the government of Kenya maintains 70 percent shareholding, the remaining 30 percent being held by institutional and private investors.