I think one of the biggest changes will need to come in battery tech. If we can get decent battery technology it will solve so many issues not just for our phones, laptops, cars etc... but it will hugely change energy generation. We have this problem where many renewable energy sources don't generate 24/7 like a fossil fuel or nuclear plant could. If we could dump excess electricity into battery "farms" that have a good capacity and life span then we could become more reliant on renewable energy.