Evo Energy

The recipient of Popular Science’s 2007 Innovation of the Year is Nanosolar’s solar powersheet. This latest advance in solar technology is paper thin, powerful, and most importantly, cheap. With the new cells, solar energy would cost as little as 30 cents per watt, down from $3 per watt with conventional solar panels. The sheets are also flexible and thin enough to roll out onto rooftops, the sides of houses, and pretty much any surface paint can go on. This development, in conjunction with California’s Million Solar Roofs initiative, may be the final boost solar power needs to be a genuinely viable alternative energy source.