Candidate should send a duly signed print-out of the registration form with their photograph affixed on it, self-attested photocopies of required documents/ Certificate and NHPC copy of pay-in slip by Speed Post/ Courier to " Chief (HR), NHPC Ltd., Recruitment Section, NHPC Office Complex, Sector-33, Faridabad – 121003 (Haryana) " so as to reach the concerned authority on or before 21 April 2014.