that's a wide range but still you'll get interview calls from every PSU and i'm certain you'll get a PSU at these marks. your worst rank can be around 1500 at 73 and best below 1000 at 78. So a PSU is certain. just prepare well for the interviews. good luck

Hello Ashish

Getting 73-78 marks in EE is really but someone pointed out that this year question was bit easy but still 78 is more than good marks and you also have a reservation category that too SC.

Chances are very high or i can say that 100 % you can get IITB or IITK ( Both are best for EE).

Now, coming to PSU's. In almost all PSU's you can get shorlisted if you score 75 marks or above(considering SC category). But the selection will again depend upon the interview which they will conduct. 

But yes you can get a call from almost all PSU's ( not sure about Powergrid).