Green Power Marketing
Green power refers to the voluntary purchase of renewable electricity by retail electricity customers. Green power is unlike compliance-based renewable energy procurement imposed by law or regulation.  About 816,000 customers in the United States procured about 8 million megawatt-hours of renewable energy through utility green pricing programs in 2016. Utility green pricing sales grew by about 6% from 2015 to 2016. 
The following links provide more information about green power programs.
National Renewable Energy Laboratory. Voluntary Green Power Procurement
This page provides links to publications about green power programs.
OpenEI. Green Power Purchasing
This page provides a database of green power purchasers in the United States and the eligible technologies.
O’Shaughnessy, E., J. Heeter, J. Cook, and C. Volpi. 2017. National Renewable Energy Laboratory. Status and Trends in the U.S. Voluntary Green Power Market (2016 Data)
For the first time in this annual series, this report includes a state-level analysis of the geography of voluntary green power sales and customers.
U.S. Environmental Protection Agency. Green Power Partnership
This page provides links to resources for the Green Power Partnership, which aims to increase organizations’ voluntary green power use to advance the American market for green power and the development of those renewable electricity sources.