Solar cells weighed in at an eye-popping $300 per watt when they first popped on the scene back in 1956. Who woulda thunk those pricey baubles would some day drop into the single digits and chase mighty king coal out of the energy generation market? Well they are, and fossil gas is the next planet-killing domino to fall. Anyone who still thinks gas has a chance should take a gander at the latest news about low cost perovskite solar cells. Perovskite solar cells hit another milestone with new record-setting conversion efficiency over a large surface (photo cropped, via NTU). What Is This About Perovskite Solar Cells? To put things in perspective, solar panels alone cost $300 per watt when the first commercial version hit the shelves in 1956, and that was just for the panel. Installing them someplace cost extra. Now, 74 years later, solar panels cost as low as 50 cents per watt, and can you can pepper your whole roof with them for an average cost of less than $3.00 per watt , fully installed. That includes the solar panels and all the other hardware, and the grid connection and whatever permits apply, plus your installer’s costs […]

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