I think about Greensburg, Kansas, a town that was completely destroyed by a tornado, but is being rebuilt by its residents as a global example of how clean energy can power an entire community - how it can bring jobs and businesses to a place where piles of bricks and rubble once lay. "The tragedy was terrible," said one of the men who helped them rebuild.

In the 27 years that I've owned my house in West Dummerston, Vermont, I've always used wood heat to some extent. But my commitment to it has ebbed and flowed. For about the first 15 years, I heated the house almost exclusively with wood. Built in 1785, the house had electric heat when I bought it, but with my work focused on energy efficiency and alternative energy sources, I couldn't bring myself to use electricity for heating, because so much energy is wasted during power generation.

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Despite the economic downturn and the trend toward smaller crowds at building trade shows, Efficiency Vermont's 2009 Better Buildings by Design Conference was a great success and actually increased attendance this year. The enthusiastic response is a tribute to the sustainable building community at large and to Efficiency Vermont, which put on a conference that was well organized, informative, and pragmatically optimistic.

Last week we reviewed the history of wind energy, including its use for pumping water and generating power. This week we'll take at look at the state of the art with wind power and what's ahead.

Over the past few weeks, we've looked at a few power-generation technologies: pumped hydro, landfill gas, and nuclear. This week, we'll examine another option that's been in the news a lot over the past few years: wind power.

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