Walmart’s Solar Roofs = A Manhattan of PVs

Artists conception - Manhattan covered with solar cells
Artist's conception - Manhattan covered with solar cells. If Walmart covers all its roofs with solar cells, they'll cover an area equal to Manhattan

The New York Times has a story today about the big box stores rushing to get solar cells on their roofs before a Federal tax break expires at the end of December. The article’s analysis is that they are primarily doing it for PR purposes, since PV-based energy is still a lot more expensive than conventional. The benefits of being able to say they are green are compelling. But the companies put a slightly different spin on it:

But retailers believe that they can achieve economies of scale. With coal and electricity prices rising, they are also betting that solar power will become more competitive, especially if new policies addressing global warming limit the emissions from coal plants.

Retailers, hoping to create a bigger market and positioning themselves at the forefront of a national shift toward renewable energy, are encouraging one another to join the bandwagon.

The current rule of thumb is that the U.S. gets about 0.1% of its electricity today from solar energy, doubling about every year (among other places, mentioned in this interview with Ray Kurzweil on NPR’s Science Friday).

I wonder how those numbers will change after this rush by the retailers?

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