To be fair, Eigg is hardly a big consumer of electricity. I was there in December of 2006. I was staying in the guest house --- there's only one. I was the only tourist there. At one point I was kidnapped and taken to their community nativity play (which was actually a lot of fun). But the population is only 83, so running the whole place off renewable energy isn't difficult.
Fuzzy pictures from my trip here; the first few are from Mallaig, the other end of the ferry link:
Fuzzy pictures from my trip here; the first few are from Mallaig, the other end of the ferry link:
https://goo.gl/photos/GQNcBpE4vVgv1A1i7