(Tulsa, Ok)--You have likely spotted those huge wind turbine blades on the backs of big rigs traveling on Oklahoma highways. Most of those are built in Texas, but the towers on which they rest are in many cases Tulsa built. There are two Tulsa plants manufacturing the towers. One of them is DMI Industries. That company's general manager, Kevin Ishmael, says the need for alternative energy sources means his business is literally churning. They expect to beef up their workforce and build even more towers. This could be just the beginning for Oklahoma. Angie Amblers with the Oklahoma Wind Initiative says the wind turbines are sprouting up in mostly west Oklahoma fields by the hundreds. She says thousands are in the planning stage over the next decade. The only holdup is getting transmission lines in place quickly to bring the wind generated power to Oklahoma homes and businesses.