Ol'lessos Technical training institute is a government Institution under the sponsorship of Anglican Church of Kenya (ACK), Nandi Diocese. It was established in 1975 as a Technical School and later converted to TTI in 1987.Built on a 40 acre piece of land, Situated on the Nabkoi-Kapsabet Highway.

The Institute is an ISO 9001:2015 Certified Institution that offers various market driven accredited programs. Enrollment: Incremental trend from below 100 at inception to over 5000 to date.
Courses offered: Those in tandem with the Big Four Agenda are:

• Building and Civil Engineering
• General Agriculture
• Medical Courses
• Automotive and Mechanical Engineering Courses

Infrastructure: over the years the Management has focused on infrastructure development to cope with the new technologies. Through this our graduates are competently trained to fit into the competitive world of work/industry. To date the Institute has modern engineering workshops for Building and Civil Engineering, Electrical and Electronics and Automotive and Mechanical Engineering.
Modern labs include: Medical laboratory, Applied Sciences Microbiology and Chemistry labs.
Food and Beverage and Nutrition and Dietetics has a modern and well equipped Hospitality Center.