Here's another sign that wind energy is coming of age: Wind law is now piling up in court precedents and is being taught at law school. ...Hamilton's wind law course covers the gamut of the legal nitty-gritty about wind energy, including easements and leases, property issues, land-use regulations, utility regulation, metering and financing, and state and federal tax, energy and environmental policies. Hamilton's class is one of three in the United States. The University of Texas at Austin has a wind law class and so does the University of Oregon in Eugene. "With turbine farms going up all over Iowa, it's the next logical step,"

Times have never been better for wind power. The industry's growth rate doubled last year, and additional turbines are going up across the country. But the industry is heavily dependent on a federal tax subsidy that's set to expire at the end of this year. And the industry's growth is steadily increasing the cost of the subsidy and making it tougher for lawmakers to keep it going. ...Last year, the industry added 5,244 megawatts of capacity, more than twice the 2,454 megawatts added in 2006. That brought the nationwide capacity to 16,818 megawatts. But that growth also means that continuing the subsidy for one more year, through 2009, would cost taxpayers $3 billion. "The problem with a long-term extension is that it's cost-prohibitive as long as the industry continues to expand. Budget-wise, it's hard to do it for an extended period of time," said Frank Maisano, an energy industry lobbyist.

Wind energy is booming in Iowa, and backers say it's only the beginning. ...But the jobs could blow away, economists warn, just as other manufacturing jobs have disappeared because of competition and technological change. Other states want to attract manufacturers, too. Wind power depends on subsidies, and changes in government policies could dampen the enthusiasm for wind. ...John Solow, a University of Iowa economics professor, is cautiously optimistic about the future for wind generation and turbine manufacturing. Future policy decisions and technological innovations could change that, he said. A breakthrough in clean-burning coal, for example, could reduce interest in wind energy and biofuels, he said.

... a coalition of local utilities is grappling with one of the thorniest challenges in the field of renewable power: how to store the excess energy windmills create when demand is low so it can be used later, when the need is greater. The group is building a system that will steer surplus electricity generated by a nearby wind farm to a big air compressor. Connected to a deep well, the compressor pumps air into layers of sandstone. Some 3,000 feet down and sealed from above by dense shale, the porous sandstone acts like a giant balloon. Later, when demand for power rises, this flow is reversed.

DES MOINES — U.S. Sen. Tom Harkin predicts the upcoming farm bill will put a greater emphasis on renewable energy, biomass production and conservation and less on subsidy payments to farmers. With Democrats capturing the majority in the U.S. Senate this week, Iowa’s junior senator could take over once again as chairman of the Senate Agriculture Committee as a new farm bill is being drafted. Harkin, D-Cumming, shepherded the last farm bill as chairman of the agriculture committee in 2002. Although he said it is not a foregone conclusion he’ll assume chairmanship of the committee once again, he already has ideas of how he wants to shape the legislation. “We have to make changes,” Harkin said. “The times have changed; conditions have changed, a lot of things have changed.”