Trading of emissions credits, allowances, and quotas is becoming widely recognized as an effective means of lowering the cost of achieving air pollution control objectives, but the use of credit trading is spreading far beyond emissions trading. Credits are now being developed to convey or represent the environmental and other benefits that flow from the use of renewable energy. This report focuses on credits that are derived from wind energy technology, but the same concepts also apply to other renewable energy technologies. Credit trading, which can be applied to a wide variety of policies, programs, and private market activities, represents a means of tapping into revenue streams that traditionally have largely excluded wind and other renewables. In addition, credit trading can help to create new revenue streams for wind and other renewables by helping to establish new markets.