Solar PV demand in the Asia-Pacific region will increase 50 percent to 13.5 gigawatts (GW) in 2013, with China, Japan, India, and Australia continuing to dominate the solar spectrum in the region, accounting for 90 percent of demand for this year, according to analysis from NPD Solarbuzz. But each country is evolving with its own set of criteria and market drivers, selecting PV suppliers and technologies based on factors including domestic manufacturing, policies, import duties, and customer preferences.