An item in the New York Times reminded me about Las Gaviotas, an experimental outpost in los llanos of Colombia, the dry savanna east of the Andes. When I visited it in the 1970s it was already an off-grid testing ground for "appropriate technology" for rural development. It is still going thirty years later. It has grown to a community of about 200, still testing "small is beautiful" energy and water systems and other village technologies.
Here is a journal of a visit there more recently, with pictures of some of the technologies.