If your son have completed the course of EEE and after that have qualified the GATE then he can go for the MTech course in EEE with the specializations as specified below:

• Automation Training
• Humanoid and Robotics
• C-DAC
• POWER CELLS AND SOLAR PANELS

This can be some good fields for your sons career.

Top ME/MTech colleges are provided below:

Andhra University College of Engineering, Visakhapatnam

Coimbatore Institute of Technology, Coimbatore

Savitribai Phule Pune University, Pune

IIT Guwahati - Indian Institute of Technology

JNTUA CEA Anantapur - JNTUA College of Engineering

Pondicherry Engineering College, Puducherry

For more colleges you may visit the link below:

https://engineering.careers360.com/colleges/list-of-me-mtech-in-electrical-and-electronics-engineering-colleges-in-india

To know more about EEE as a career choice visit the link below:

https://www.careers360.com/courses/electrical-and-electronics-engineering-course

I hope this answer helps. All the very best for your future endeavors!