The Danish wind power market analysis firm BTM Consult ApS (BTM) released its latest annual market report in late March. Although the press release on the report notes considerable uncertainty in projections beyond 2011, it also states that its projection would lead to total global cumulative installed wind generating capacity of 455,000 MW by 2016. If that amount of wind capacity were installed in the U.S., it could be expected to generate roughly 1.3 trillion kilowatt-hours (kWh) of electricity per year (my estimate), or 25% or more of total U.S. electricity supply.
Other information from the release:
Update 13 May 2007: This compares with a World Energy Council estimate in the late 1990s that wind capacity could grow to 180,000 MW to 474,000 MW worldwide by 2020. BTM Consult's latest numbers, while tentative, are somewhat more expansive.