Author’s Note: This is the second in a two-part series on Renewable Energy Certificates (RECs). In the first post we told the history of REC , its definition and basic purpose. This time, we explore the myriad ways in which RECs are used; impact on the electric grid; role in clean air policy; growth of large scale renewable development; and the REC’s recent resurgence.

Alden Hathaway, SVP Sterling Planet, provides insight into the consequences of the new 30% solar import tariff, and its potential effect on wind development, particularly in the eastern US. (image from Avangrid)