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Solar Technology in Play

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The prospect of generating pollution-free power from the sun’s rays is appealing, but to-date the low price of oil combined with the high costs of developing new technology have prevented the widespread adoption of solar power in the U.S. and beyond.

At a current cost of 25 to 50 cents per kilowatt-hour, solar power costs as much as five times more than conventional fossil fuel based electricity. And dwindling supplies of polysilicon, the element found in traditional photovoltaic cells, are not helping.

According to Gary Gerber of the Berkeley, California-based Sun Light & Power, not long after Ronald Reagan moved into the White House in 1980 and removed the solar collectors from the roof that Jimmy Carter had installed, tax credits for solar development disappeared and the industry plunged “over a cliff.” But with the new Obama economic development package the federal government will also being injecting billions of dollars which will help speed up and make the technology even more environmentally friendly.

In the realm of research and development, enterprising engineers are working hard to get solar power’s costs down, and expect it to be price-competitive with fossil fuels within 20 years. One technological innovator is California-based Nanosolar, which replaces the silicon used to absorb sunlight and convert it into electricity with a thin film of copper, indium, gallium and selenium (CIGS). Says Nanosolar’s Martin Roscheisen, CIGS-based cells are flexible and more durable, making them easier to install in a wide range of applications. Roscheisen expects he will be able to build a 400-megawatt electricity plant for about a tenth of the price of a comparable silicon-based plant. Other companies making waves with CIGS-based solar cells include New York’s DayStar Technologies and California’s Miasolé.

Another recent innovation in solar power is the co-called “spray-on” cell, such as those made by Massachusetts’ Konarka. Like paint, the composite can be sprayed on to other materials, where it can harness the sun’s infrared rays to power cell phones and other portable or wireless devices. Some analysts think spray-on cells could become five times more efficient than the current photovoltaic standard.

Environmentalists and mechanical engineers aren’t the only ones bullish on solar these days. According to the Cleantech Venture Network, a forum of investors interested in clean renewable energy, venture capitalists poured some $100 million into solar start-ups of all sizes in 2006 alone, and expect to commit even more money in the next several years. Given the venture capital community’s interest in relatively short-term returns, it’s a good bet that some of today’s promising solar start-ups will be tomorrow’s energy behemoths.