This project An evaluation of the effect of manpower training and development in service organization has its study focused on power holding company of Nigeria (PHCN) PLC Enugu Zone. The objective of the study is to highlight the advantages of human resource training and development and recommend an appropriate measure that could help improve the current human resource training programmes. Relevant data for this research work were collected from both primary source and secondary source of data. A descriptive method was used for this study. The total population of the staff in the organization is 250 out of which questionnaires were drawn from staff of the organization which constitute a sample size of 154. The statistical instrument used in testing the validity of the hypothesis was chi-square. Among the major findings of the work was that training and development programme improve productivity and better performance. The research, therefore, recommended that there should be a free flow of information to enable all the staff to be aware of the training and development programme available to them both internally and externally.