Solar Industry, Mar. 2017, by Edurne Zoco.
http://issues.solarindustrymag.com/article/how-will-the-pv-module-market-fare-in-2017

"Total module costs for industry leaders are forecast to continue declining throughout the second half of 2017 to reach around $0.30/W for best-in-class p-type module costs, thereby widening the gap in cost structure between lowest-cost producers and other producers and affecting gross margins and profitability throughout 2017."