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Why aren't there more offshore turbines in the U.S. Wind Turbine Database?

The U.S. Wind Turbine Database (USWTDB) includes all utility-scale turbines that have been installed in the United States. As of January 2019, only one offshore wind farm has been constructed in the U.S. - the Block Island Wind Farm off Rhode Island. However, according to the Department of Energy, several other offshore projects are in advanced stages of development. If and when those projects are constructed, the turbines will appear in the USWTDB.