Gently rustling the leaves of the trees, giving flight to a kite held by a child, violently tossing around everything in its way, wind is many things - including a green energy source.

What it isn't is a commodity. You can't bottle it, transport it, or trade it. In fact, it is essentially an anticommodity, a competitor to oil and natural gas, even a competitor, tangentially, to corn and soybeans.

Getting power from wind is hardly a new idea. Wind has been used to power grain mills and water pumps for centuries, and such mundane uses continue today. Electrical power generation by wind started way back in the 1880s and flourished in rural areas until the expanding electrical grid reached them. Times of high fossil fuel cost or low availability (such as after World War II in Europe) ensured that electrical power generation by wind was never fully abandoned.

In response to the fuel crisis in the 1970s, the first huge modern wind farms such as the one in the Altamont Pass in California were built to supplement electricity generation and lower electrical costs. As one of the oldest and largest wind farms in the U.S., the Altamont Pass installation has a long track record and continues to influence future wind farm development.

But the lessons learned from Altamont aren't necessarily rosy ones. Altamont is the object lesson in the need for extensive environmental impact studies before siting wind farms. The relatively small, fast design of the Altamont turbines and their close spacing proved deadly for birds in the area, something that is brought up every time a new farm is proposed. The industry counters that the current generation of wind turbines are much larger, with slower-moving blades which one industry expert categorized as the difference between a Cuisinart and a ceiling fan.

But the size of the turbines raises yet another issue - aesthetics. While many people think a large, gently spinning wind turbine is beautiful, the residents of coastal areas seem to disagree. In Cape Cod, a proposed offshore wind farm has faced significant hurdles because of the impact on the view as well as unknown fishing implications. Because the technologies are still relatively novel, it's nearly impossible to say with certainty what's real, and what's classic not-in-my-backyard syndrome.

Either way, in this era of rising energy costs and concern for the environment, wind power presents a zero-emission, low-cost way (3.5 to 5 cents per kilowatt hour) of producing much-needed electricity, and so the industry is growing.

Industry Growth

In 2007, just 1.3% of all electricity consumed worldwide was generated by wind power. The global wind energy industry is continuing to grow year by year. The World Wind Energy Association (WWEA) reports that 19.7 GW of capacity was installed in 2007 - an increase of 26.6%. This came on top of the record 2006 growth, up 25.6% over 2005.

Speaking of things green, Germany currently leads the world in established wind power capacity, with the United States, Spain, India and China rounding out the top five. Of those five, the U.S. saw the greatest increase in new capacity installed in 2007 (up 45% from 2006), but China gets the award for most improved with 127.5% more megawatts (MW) in 2007 than 2006. Who says China's nothin' but coal?

In the United States, 1% of electricity comes from wind power. Here are a few of the more-interesting propaganda bullets from the American Wind Energy Association:

• The new wind projects in 2007 accounted for about 30% of all new power-producing capacity added in the nation.
• Electricity generated by wind power reduces the amount of natural gas and other fuels used for electricity generation, thereby lowering price pressure on other fuels and saving money for consumers even if they live in regions with no wind farms or wind power generation.
• "To generate the same amount of electricity using the average U.S. power plant fuel mix would cause over 28 million tons of carbon dioxide (CO₂) to be emitted annually."

The point isn't that wind is all just roses and no thorns. Rather, this is an industry with serious legs underneath it, and the fundamental drivers - increased energy costs and increased environmental concerns - aren't going away.

Making The Play

Companies involved in wind power range from tiny pure-play wind power startups to major multinational mega companies, and everything in between. From turbine manufacturers to construction companies and project planners to utility companies, a wide range of goods and services are needed to plan, install, run and maintain wind farms.

As with many emerging technologies, the challenge is separating the pure-plays. Buying Siemens or GE for their exposure to wind power isn't particularly sound asset allocation. But there are a few pure-plays:

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