One basic criterion governing wind farms is that each turbine needs room. Developers disperse the industry's well-known three-bladed machines widely to prevent one from starving the next of wind since they leave a long, turbulent wake behind them. That configuration has never been suitable for vertical-axis turbines, the upright type that spins somewhat like an egg whisk. A single one typically gathers less energy than a traditional design, which contributes to the problem.
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