In order to get off oil as our main energy source, renewable energy needs to be cost-competitive with natural gas and coal. Innovations in solar and wind power are making strides toward that goal, but it will take a major paradigm shift to bring them both down in cost.
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The Chaska, Minn.-based company Sheer Wind thinks it has a design that could bring the cost of wind power down to a price competitive with natural gas. Daryoush Allaei, Sheer Wind's chief technical officer, told DNews that a utility-scale system of these wind turbines - that is a 100 to 500 MW power plant - the cost could be as low as 1 cent per KWh. For comparison, conventional tower and blade wind power plants cost about 45 to 80 cents per KWh and natural gas plants cost about 2 to 3 cents per KWh.
The company's Invelox captures wind using wide-mouthed funnels. Inside, passageways turn the wind horizontally and taper it into a narrow space, which naturally accelerates the flow. The higher speed wind is then channeled into a turbine positioned at ground level. According to the company, the system works even if wind speeds are slow at the top. For example, a wind entering at 10 mph is increased to 40 mph by the time it enters the turbine. After passing through the turbine, the wind is exhausted back into the environment at 15mph.
The unit is about 50 percent shorter than traditional wind towers and the turbine blades on the generator are 84 percent smaller - as a result, equipment and maintenance costs are lower.
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Daryoush Allaei, Sheer Wind's chief technical officer told DNews that the design is also far less harmful to birds than conventional blade wind turbines. "Birds have difficulty with moving objects, like with a traditional wind blade that can travel at speed of 150 to 200 mph at its tip," Allaei said.
Because the top of the Sheer Wind Invelox is not a suction or in-take valve type funnel, air flows into the funnel naturally and is easy for birds to avoid. "If a bad-boy bird decides to explore and actually fly in, one can place net right at the bottom of the intake to catch them and then release them," Allaei said.
Currently Sheer Wind is custom building systems for a few clients and is working toward mass production.