Components of that ETF showing particular strength include shares of SolarCity (SCTY), up about 29% and shares of Renesola (SOL), up about 15.5% on the day.
As you can see from the chart above, the current price leaders are First Solar (NASD:FSLR), Renesola (NYSE:SOL), Trina Solar (NASD:TSL), Yingli Green Energy (NYSE:YGE), and Jinko Solar (NYSE:JKS).