Hello Nitesh,

 PSU Recruitment through GATE is usually announced by each company differently and they will specify the GATE scores separately. The GATE scores for PSU recruitment will not be valid for three years. Most of the times GATE scores are used for shortlisting the candidates but sometimes they are also used for direct recruitment. This solely depends upon the PSUs and you will have to check each one to know the selection process.Also, since there has been no such announcements of a possibility of less vacancy for EE students, I don't think you need to worry. If you wish to know about the previous years cutoffs and you want to apply for a particular PSU of your choice, you can check out the link below. Good Luck!

https://engineering.careers360.com/articles/psu-recruitment-through-gate