The Hawthorne studies were the first research plan to attempt to enumerate employee’s attitudes and correlate attitude with overall work competencies. In the mid-1930, two years after the Hawthorne studies were accomplished; Hoppock (1935) published the first rigorous study about job satisfaction. This critical study addressed job satisfaction from a much more complex. The main objective of this study is to identify the determinants of job satisfaction among the employees in the Haryana power sector and compare the level of job satisfaction between the employees of DHBVNL (Dakshin Haryana Bijali Vitran Nigam Limited) and HVPNL (Haryana Vidyut Prasaran Nigam Limited). The data is collected from 50 employees working in the Haryana Power Sector with the help of a questionnaire developed on 7 points Likert scale via email as well as office visits. The data is analyzed by employing Descriptive Statistics and an Independent Sample T-test. This paper finds out the major determinants contributing to the higher level of job satisfaction and also the least satisfying determinants. This study also reveals a considerable difference in the level of job satisfaction amongst employees of HVPNL and DHBVNLonly towards two variables out of a total of 30 studied variables and towards the remaining variables, there is no significant difference in the level of job satisfaction among the employees of DHBVNL and HVPNL.