Wind turbines, solar panels and other renewable energy sources may have a clean, green appeal, but their size, complicated set-up and aesthetics seem destined to keep them out of the hands of individual homeowners. Slowly, such perceptions are changing as home improvement retailers begin stocking do-it-yourself kits for eco-friendly tinkerers. In December, 21 Lowe's Energy Center stores in California started selling the first-ever solar panels that customers could buy — at $893 per panel — ...

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