Green Public Procurement has been used as a tool to achieve environmental objectives by some countries especially in Europe. Public procurement in Kenya is estimated to account for between 70 and 80 percent of the national budget. This gives the government purchasing power to influence manufacturing and supply of green products for sustainable development. County governments in Kenya are allocated between 15 and 45 percent of the total country's income. Despite all these finances Counties

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... s, many of them do not fully use their purchasing power to achieve environmental objectives. Laikipia County for example, did very well on procurement activities to be ranked the best performing entity in public procurement in Kenya in 2014, yet it did not have a similar identity on Green Public Procurement. It is this research gap that this study sought to fill. The purpose of this study was to evaluate the factors affecting implementation of Green Public Procurement in Laikipia County government. The study was guided by knowledge gap and buyers' perception on green products as independent variables and implementation of Green Public Procurement as the dependant variable. Descriptive research design was applied in this study. The study targeted County governments in Kenya. The study population was 45 employees from Laikipia County government drawn from procurement and finance department. Primary data was collected by use of a semi structured questionnaire. The questionnaire was self administered. Descriptive statistics and statistical model of multiple regression were used in analysis of data .The study established that knowledge gap (0.561) and buyer's perception on GPP (0.143) had a positive effect on GPP implementation with knowledge gap as the major one. The study recommends County governments to organize for compulsory training of its staff on GPP. They should conduct lifecycle costing of all products procured by the County governments so as to create the right perception on these products.