A new report by the Geothermal Energy Association (GEA) shows strong growth in new geothermal power projects continuing through 2009. U.S. Geothermal Power Production and Development Update, September 2009 identifies 144 new geothermal projects under development in fourteen states that could represent as much as 7,100 MW of new baseload power capacity. When added to the 3,100 MW of existing capacity, 10 Gigawatts of geothermal power appears to be feasible.

The report found a total of 144 projects under development that could add between 4,699.9 and 7,109.9 MW of power to the U.S. geothermal energy output. At the high end, that would be enough baseload power to supply about 20% of California's total electric power in 2008 — or enough generating capacity to supply the power needs of about 7.2 million people.