Hello nithin,

There are some best colleges offering renewable energy engineering in Tamilnadu and Karnataka :-

•Amrita School of Engineering, Coimbatore.

•Gandhigram Rural Institute, Dindigul.

•Tamil Nadu Agricultural University, Coimbatore.

•Periyar Maniammai Institute of Science and Technology, Thanjavur.

•College of Engineering, Guindy.

•Visvesvaraya Technological University, Belagavi.

I hope this helpful for you.

Best wishes!!