This study reports the performance of 23 Electrical Distribution Divisions (EDD's) of an Indian state, Uttarakhand for the period of 2005-2006 using the concepts of Additive Model (AM), Slack Based Modelling (SBM) and Two-stage Data Envelopment Analysis (DEA). Slack Based Modelling helps in quantifying the slacks, which is a hidden source of inefficiency that might be present in BCC efficient DMU's. Following the slack quantification, a two-stage DEA is applied. The results obtained from AM and SBM indicate that numerous EDD's have scope for improvement in overall efficiency by incorporating the slacks that have been identified in the particular EDD. Further the two stage DEA modelling suggest that the inefficiency is primarily due to the intermediate measures. © 2016 IEEE.