Hi Rahma.....

Doing M tech in Energy systems is really good if you are mechanical engineer, placements are also good.

If you are electrical engineer, you have to face some difficulties in course as it is mostly mech. based, and for placements also companies mostly do not prefer an energy engg. with electrical background. you will get chance to sit in so many companies, may get some internships, which later point may absorb you in company.

Hope it helps you

Thank you