How much money an electrical engineering professor earn from grants in US universities?

I am a newcomer to this site and I want you to help me about my question. Thank you.

I know that in US universities, an electrical engineering professor can earn money from two ways: 1) the salary which get from university which is normally 70 k$ as starting salary. 2) the money which can earn from grants via getting researching project from different companies or others.

So, I want to know, how much money an electrical engineering professor can earn from grants normally?

Thanks a lot.