Yea ofc there is allways a too big. But energy makes a lot more sense over a big area. Not in form of a big power plant, but in a big energy network. If it’s sunny in one region and they make a lot more power than they can use and at the same time a different region has a power shortage, because it’s a cloudy day it only makes sense to share the energy. The larger the skale of your network the more efficient is your energy production. Less recources get wasted.