If you are interested in how wind power can continue to soar, be sure to read an excellent study by Lawrence Berkeley National Laboratory: Using the Federal Production Tax Credit to Build a Durable Market for Wind Power in the United States.
The authors conclude:
… our analysis suggests that a longer-term extension of the federal PTC may provide a number of benefits, including accelerated wind deployment, reductions in installed wind project costs, and increased domestic wind turbine and component manufacturing. At the same time, we also identify several PTC design considerations, beyond the duration of any extension, that may deserve consideration by Congress.
Thanks to Hal L. for sending this my way.