There are several alternative energy electronically-traded funds (ETF), that enable you to invest in these sources of renewable energy.
Many countries, including the United States, are promoting this sector, through subsidies, research support and preferential regulatory treatment. It can receive a further boost based on the outcome of the Copenhagen conference on climate change this December.
Some ETFs to consider:
- PowerShares WilderHill Clean Energy (PBW)
- PowerShares Global Wind Energy Portfolio (PWND).
- PowerShares Global Clean Energy (PBD)
- PowerShares WilderHill Progressive Energy Portfolio Fund (PUW).
- Van Eck Market Vectors Solar Energy (KWT)
- Claymore/MAC Global Solar Energy (TAN)
- First Trust ISE Global Wind Energy Index Fund (FAN)
- Van Eck Market Vectors Global Alternative Energy ETF (GEX)
Here is a more extensive list, that includes nuclear energy (not so environmentally friendly due to nuclear waste, but good for cutting back on greenhouse gas emissions).
Some analysis on these ETFs: