Peketsa has a BSc and MPh degrees taken in 1992 and 1996 in Information Science from Moi University, Eldoret, Kenya. Later he started working on PhD degree, also at Moi University in Eldoret, which he completed recently. He was a UNU Fellow at UNU-GTP in Iceland in 2015. Following that he was certified as a C-level Project Manager by the International Project Management Assocation (IPMA).
Peketsa joined KenGen in 1997 as an Information Scientist. In 2009 he was promoted to be the Chief Research and Consultancy Officer. There he provided leadership and ensured effective management of staff and resources in the Research and Consultancy section. Some of the duties have included effectively monitoring and ensuring cost effective geothermal research, utilization, and consultancy activities; evaluating and executing research related aspects of the geothermal expansion plan; initiating geothermal research proposals on exploration, development and utilization for discussion and approval; draft, edit MoUs and contracts; coordinating and directing geothermal resource marketing; coordinating and marketing KenGen’s geothermal expertise; advisory and consultancy; develop, deploy, and retain talented staff in accordance with the established performance management system; and coordinating training between KENGEN and the UNU-GTP. In 2016, he became KenGen‘s Manager of Geothermal Resource Development. He was one those in charge of KenGen‘s Olkaria Spa project, which was modelled after the Blue Lagoon in Iceland, and has become a popular destination for visitors.