According to the ETF Finder at ETF Channel, DCI and XYL collectively make up 4.66% of the Cleantech Portfolio ETF (PZD) which is higher by about 0.8% on the day Thursday.
Rafael Coven, the adviser to the underlying index for PZD, noted that the poor performance of most renewable energy stocks in 2010 was a major reason why Cleantech Index-based funds (such as PZD) significantly outperformed their peers.