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The purposes of this research were to develop and analyze the structural equation modeling of the effectiveness of hydropower plant. The population was 1,983 employees of hydropower plant Electricity Generating Authority of Thailand (EGAT). The sample was 322 people selected by simple random sampling. A questionnaire was a research instrument consisting of 4 parts which were; (1) transformation leadership (2) job resources (3) employee engagement and (4) the effectiveness of the hydropower plant. The Cronbach’s alpha coefficients were 0.96, 0.83, 0.92 and 0.86 respectively. The data were analyzed by Structural Equation Modeling. The findings of this study revealed that transformation leadership had positive direct effects on job resources (β = 0.67, p < 0.001), employee engagement (β = 0.39, p < 0.05) and the effectiveness of the hydropower plant (β = 0.18, p < 0.05) and had an indirect effect on the effectiveness of the hydropower plant through job resources (β = 0.42, p < 0.05). However, employee engagement to the organization had no direct effects on the effectiveness of the hydroelectric power plant (p < 0.05). The structural equation model of the Effectiveness of Hydropower Plant was consistent with the empirical data (P-value = 0.09, Chi-Square = 80.44, df = 65, CMIN/df = 1.24, GFI = 0.97, AGFI = 0.94, CFI = 0.99, RMSEA = 0.03). The model accounted for 55% of the variance of the effectiveness of hydropower plant and a substantial proportion of the variance of the mediating variables. The findings of this research suggested that there should be a focus on developing transformation leadership of senior leaders to promote the job resources which would enhance their employee engagement. These could affect the effectiveness of the hydropower plant.
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