In what is becoming a near-weekly occurrence, another large energy company plunked down a sizeable chunk of change in hopes of greening up its image, generating cleaner power, and maybe even saving the world.

The latest buyer is Alliant Energy Corporation, who ponied up nearly $820 million dollars for 303 wind turbines from Vestas-American. Alliant is slated to use the turbines for a variety of wind-energy projects throughout the American Midwest, including Whispering Willow Wind Farm-East, a 200 megawatt facility in Franklin County, IA.

Sales like these have become more and more common in recent months, continuing a trend that saw global wind power capacity rise 27% over the course of last year.  The burgeoning demand has caused a growing shortage in supply, but with petrochemical prices at record highs and the American dollar spending relatively cheap, many companies clearly see this juncture as the time to buy.