Former Managing Director of Uttar Pradesh Vidyut Vitran Nigam, Singh was appointed on the post by the previous BJP government in Uttarakhand.
His tenure was due to expire in September this year.
Singh cited personal reasons for his step.
He told PTI today that he would like to give priority to some long pending personal assignments.
During his tenure, Singh made 70 recommendations which were accepted by the Uttarakhand government to improve the power scenario in the state. PTI Corr KAS SHS