Most Engineering is very broad and you learn the same stuff in the first 2 years before specialising, I think some Uni's might do actual renewable energy degrees (although I cannot quote any without researching first), but perhaps going with an electrical engineering or mechanical engineering degree, as they will underpin a lot of what you'll be doing as a career. what kinda thing did you think you want to od with renewable? As in design new technology? Create it? Build it? As you could argue Civil also has a part to play in this. Or you could go down chemical or molecular and research the chemistry side of renewable, creating carbon capture technology or developing enzymes that eat plastic or whatnot.
Can't really describe all the ENgineering as there's just so much, but they are similar in the first 2 years you do a degree. i would quote a website but again it'll take research for an appropriate one, and also not all the engineering disciplines are shown (mainly just the generic 'dirty' engineering degrees): Mechanical, Electrical (this is a clean one) Chemical, Aerospace, Civil. And sometimes computer engineering. They leave out the newer ones e,g, Biomed or Molecular. But yeah just research around and then we can give you Pros and cons of each one. Sorry for a long winded not a definite answer.