In what engineering field can i study renewable energies in the USA? I am applying for a scholarship at the USA in order to  study  renewable energies.
For that I have to ask if it is considered as a subfield of electrical engineering or not in the US, because I can't find a major in energy engineering in the application form and the closest in my mind to renewable energy engineering is electrical engineering.
Renewable energy is an application of engineering, and requires expertise from various disciplines. For example, wind energy requires civil, mechanical and electrical engineering. 

I don't know how things work in the US, but in the UK my advice would be to identify which discipline interests you the most and pursue that in a department that includes renewables on the syllabus. Then either look for a job in renewables, or do a masters to learn more about that industry. However, I don't know how applicable that advice is to your situation.