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The pre-Columbian ancestors of today's Indians used it. So did the ancient Romans, the medieval Arabs and many other preindustrial peoples around the world.

It's still widely used in less-developed countries, and it is increasingly popular in well-developed countries as energy shortages loom.

But what's the secret of the house's amazingly low power consumption? Using solar power, the house generates 120V AC, but it's also wired for 12V. The living room has three 7W 12V compact fluorescent lamps, a 12V Widescreen LCD TV, a DVD player, and an efficient surround sound stereo system. The office has a Mac laptop acting has a desktop, and all other computer peripherals are switched off automatically when not in use. When not lit by daylight, the office uses compact fluorescents lamps, and 12V LED desk lamps.

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Quoted: How one Atlanta house is an energy-efficient "gold standard"