vulnerability assessment and penetration test ( vapt ) for ot ( operation technology ) and it ( information technology ) infrastructures installed at nhpc corporate office and 21 power stations/ projects , audit - 1 : , it cyber security audit & vulnerability assessment analysis at all the 21 power stations of nhpc limited , as per scope of work , site address as per annexure-a ( no . of audits 21 ) , it cyber security audit & vulnerability assessment analysis at nhpc limited , as per scope of work at corporate office , faridabad , haryana ( no . of audit 01 ) , audit - 2 : , it cyber security audit & vulnerability assessment analysis at all the 21 power stations of nhpc limited , as per scope of work , site address as per annexure-a ( no . of audits 21 ) , it cyber security audit & vulnerability assessment analysis at nhpc limited , as per scope of work at corporate office , faridabad , haryana ( no . of audit 01 )