Wind energy has its challenges. The weather is not the same everywhere. The variable nature of wind means there are times when turbines are not turning. Where the intermittent production of wind (and solar) power can span a broader geography, however, it is easier to overcome fluctuations in supply and demand. Interconnected grids can shuttle power to where it is needed. Critics argue that turbines are noisy, aesthetically unpleasant, and at times deadly to bats and migrating birds. Newer designs address these concerns with slower turning blades and siting practices that avoid migration paths.
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