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I see a few suggestions for solar, and this is good; you are at high altitude so the increased efficiency might offset some of the days where the weather is bad, but I can't help but feel that suitably efficient panels are bulky, fragile and expensive. I've not idea if this will work in your specific region, but it might be worth considering other forms of natural energy, specifically wind and water, as a power source. You ought to be able to construct a windmill and/or watermill using locally sourced materials - wood, mostly - so all you would need to take would be some power sockets, wire and a small motor/transformer to generate the power. A quick Google turns up a bunch of links, but this one should give you an idea of what might be possible, and it's also the kind of project that could get the locals involved and take on a life of its own over the course of the stay.