CHAMPAIGN, ILL. -- Grain farmer Mike Doyle has grown to love the big, spindly wind turbines that rise from his central Illinois prairie.Their blades, many more than 100 feet, cut the wind with a low, rhythmic whooshing noise. Not too long ago, he admired a rainbow arching over them. Doyle's a little embarrassed when he describes the scene, but he's sincere. "If that wasn't the most beautiful sight I've ever seen." The money's not bad either. Doyle is paid just over $35,000 a month for the seven wind turbines in his soybean and corn fields. Those turbines and thousands others across the Midwest the past few years were part of an unprecedented build-out for the wind-power industry. That expansion is now drastically slowing as financing dries up for many projects because of the global economic crisis. Companies that bankrolled much of the boom -- the insurer AIG ( AIG), now-bankrupt financial service company Lehman Brothers and Wachovia Corp. ( WB) -- are among the meltdown's biggest losers. "There's definitely a lot of, obviously, upheaval," said Ric O'Connell, a renewable energy consultant with Black & Veatch Corp., an Overland Park, Kan.-based engineering and construction company. "I would definitely think in 2009 there are going to be projects that are going to be delayed." Already some developers are scaling back. Noble Environmental Power, an Essex, Conn.-based developer with projects from Maine to Michigan, Wyoming and Texas, said last month it is cutting back development next year and laying off workers. Florida Power and Light ( FPL), another major developer, has said it will slow down in 2009, too. And last month oil tycoon T. Boone Pickens famously delayed his massive Texas wind-farm plans, alternately blaming a lack of financing and declining petroleum prices. The country's wind-power capacity has increased by 500 percent in the past 10 years, to just over 21,000 megawatts, according to the American Wind Industry Association. A one-megawatt wind turbine can generate enough electricity in a year to power up to 300 homes for a year. Even now, there are 86 wind-farm projects under construction around the country, the association said. Fifty-seven are in the windy states in country's midsection from Texas to the Dakotas, Minnesota and Illinois. About 60 percent of the new capacity has been built since the beginning of 2005 and driven by factors ranging from renewable energy to, until recently, high oil and natural gas prices. But the most important of those factors are federal tax credits and state mandates requiring that some power be generated by sources such as wind or the sun. The mandates, which exist in 28 states, are responsible for about two-thirds of the market for wind energy, according to Hans Detweiler, director of state policy for the American Wind Energy Association. And the tax credits generate much of the money to build. Firms like American International Group Inc., Lehman and Wachovia helped finance many projects by taking short-term ownership in exchange for the credits to help offset their own income. Those three were among the biggest investors in the industry. Now, AIG is trying to survive the financial meltdown, Wachovia is being bought by Citigroup ( C) and Lehman Brothers filed for bankruptcy this year before being sold.