[estaseuropano]

Solar seems like a best fit for existing buildings, like Musk's solar roofs/windows. For wide spaces there can be other options, like wind, which has a much lower footprint. But even a well placed solar farm does not need to smother wildlife, e.g. you leave space in between, plant lower bushes, etc.

As regards efficiency, solar is nowadays not bad, there's a reason it is the cheapest energy in many countries, especially during the summer months.