Most service organization in Nigeria, in recent years are facing the challenges of labour turn over due to lack of job training of their employees. More so, most service organization keep downsizing their employees and recruiting new ones as a result of changes in their services and work processes driven by technological trends and competitive environment. Therefore, it is logical for employees to keep changing their methodologies, thus giving room for continuous training and development. The objective of this study was to examine whether employees' training and development enhances work efficiency in the service organization and aimed at finding out the adequacy of training and development programme provided to the staff of Power Holding Company of Nigeria (PHCN) in Zaria. Primary data were used for the study, which were generated through the use of questionnaires. The study is a descriptive research method and adopted the system theory. To guide the study, three research questions and hypotheses were posed. 

The study took a sample of 154 respondents from a population of 250 from the total population of staff in the Power Holding Company of Nigeria(PHCN) Zaria used as case study. Simple random technique was used to select the respondents. The statistical instruments used in testing the validity of the hypotheses were analyzed using chi-square. Major findings indicated that there is a positive correlation among all the variables. Result of model summary shows that the independent variables account for 39.1% of the variation in organizational performance.

 The study also reveals that inadequate skilled personnel, equipment and gross corruption especially on the part of health workers gravely affect the performance of the PHCN.The study therefore concluded that for training and development to have significant impact on organizational performance, employees need to be motivated during training programs. It wasrecommended that organization should introduce reward system for outstanding performance so as to motivate employees to always put in their best during each training session. And organization should be effective in integration of resources, physically and human will to yield high output or performance both internally and externally.