Solar Islands

Here's a nifty proposal for thermal solar power. You etch a reflective pattern in glass, mount thermal concentrator troughs on top of it, then track the sun by mounting the whole thing on a floating ring. You can float it in the ocean or you can dig a water-filled, circular ditch on land. Just rotate the ring to track the sun. The author estimates break-even at about $.15 per kWH for a 3 km-diameter island.