Friday October 3, 11:14 pm ET By IndexUniverse Staff While investors debate the merits of dipping into alternative energy markets, a niche set of exchange-traded funds is holding up even better than their more diversified rivals. Four different ETFs tracking companies involved in servicing and powering water systems are outperforming broader rivals. In the case of two of those, the gap has been quite large throughout the year. So far, PowerShares Water Resources (AMEX: While PBD is a highly diversified renewable energy ETF with everything from solar to wind to biofuels in its portfolio, it doesn't cover water. Neither does another broad-based member of the group, PowerShares WilderHill Clean Energy (AMEX:PBW - News ). It's the most popular alternative energy ETF that focuses only on U.S. companies. PBW has lost more than 46%...
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