In the second quarter of 2014, more than 1.1 gigawatts of solar power capacity was installed across the United States, according to a solar industry group's report. (According to the New York Times, a gigawatt "is the equivalent output of one large nuclear power plant.")
The Solar Energy Industries Association says that the US now has approximately 15 gigawatts of installed solar capacity. And more than a gigawatt of capacity has been added in each of the past three quarters, most of it utility scale, the organization says. New York was ranked eighth among states for the amount of solar installed, though the exact figure for installed capacity is only available in a paid version of the report.
The report also points out that in the first six months of 2014, more than half of all new electricity generation capacity was from solar installations. And in the second quarter of the year, more than 100 megawatts of solar capacity was installed without using any state incentives, the report says.
A summary of the report is available here