Here in the medieval space age, our solar panels work fine; they're almost indestructible. I've seen panels from the 1970s that are still working perfectly - even some with bullet holes or other major damage (like being run over by vehicles) continuing to function. But the real problem is the batteries - they're expensive, toxic and don't last long. There ARE much better alternatives; on a basic level, various forms of hydro power can be made to work 24/7 using blacksmith-level tech or lower. A dam or a flowing stream or pipe is a battery. Current is current!
Of a higher order, there are devices that I've seen work which will produce usable power from LITERALLY NOTHING and cars can be run on water - I've seen this as well.
For more details see http://gonow.to/freeenergy
Actually, there are LOTS of vacant caves. I stay in some for a few days every now and then. Fortunately, most hominids prefer the decaying creature's imagined comforts to a cave, realty to reality, or they'd be more crowded no doubt. I have to walk a small distance to reach most caves; sometimes climbing is necessary too.
The real trick is knowing which caves to avoid. Caves attract many things, as the cave of the skull attractys the resonance of thoughts - or gods.
Seth is a red boar, old Saros Set in his ways. Satan literally means 'accuser' in a judgemental sense, Lucifer means light maker (not bringer), a change agent. One culture's deity is another's devil and focused belief creates the gods, demons and spirits; but when humans forget them a link to other realms of perceptions is broken. Rationalism isn't always a survival trait.
Leaders require followers; it's not the other way around. In Buddhism the Maitreya is the one who will become the Buddha. A little difficult to be a self-proclaimed one, though - like saying 'I am modest'. The crown descends from heaven and settles where it finds Will.
Contemplating the concept and not referring to personality is a good idea in enlightenment circles - or political ones. Thinking is useful, but NOT thinking is much better than following any dogma, dog or god.