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Affordable solar?
Date:12/12/2011

It's time to stop thinking of solar energy as a boutique source of power, says Joshua Pearce.

Sure, solar only generates about 1 percent of the electricity in the US. But that will change in a few years, says Pearce, an associate professor of electrical engineering and materials science at Michigan Technological University. The ultimate in renewable energy is about to go mainstream.

It's a matter of economics. A definitive new analysis by Pearce and his colleagues at Queens University in Kingston, Ontario, shows that solar photovoltaic systems are very close to achieving the tipping point in many regions: they can make electricity that's as cheap sometimes cheaperthan what consumers pay their utilities.

Here's why. First, the price of solar panels has plummeted. "Since 2009, the cost has dropped 70 percent," says Pearce. But more than that, the assumptions used in previous studies have not given solar an even break.

"Historically, when comparing the economics of solar and conventional energy, people have been very conservative," says Pearce.

To figure out the true cost of photovoltaic energy, analysts need to consider several variables, including the cost to install and maintain the system, finance charges, how long it lasts, and how much electricity it generates. Pearce and his colleagues performed an exhaustive review of the previous studies and concluded that the values given those variables were out of whack.

"It is still a common misconception that solar PV technology has a short life and is therefore extremely expensive," he said. However, PV panels are solid-state electronic devices with no moving parts and should last a long time. "Based on the latest long-term studies, we should be doing our economic analysis on a 30-year lifetime at minimum," Pearce said.

In addition, most analyses assume that the productivity of solar panels will drop at an annual rate of 1 percent or more, a huge overe
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Contact: Joshua Pearce
pearce@mtu.edu
906-487-1466
Michigan Technological University
Source:Eurekalert  

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