Lower than average wind speeds are hurting US wind power producers
Unusually still weather in the upper Midwest and Great Plains in late 2018 has already taken a bite out of earnings at NextEra Energy Inc. and Avangrid Inc., which both operate large wind farms. Other wind generators have yet to report fourth-quarter results, including Pattern Energy Group Inc., TerraForm Power Inc. and Clearway Energy Inc.
Source: Renewable Energy