Renewable energy advocates have been calling for a change in the tax laws to allow renewable energy within the REIT structure. A REIT is allowed to pass profits directly through to investors. These profits are not subject to double-taxation like most corporate profits. Owning shares of a renewable REIT would be much like owning a slice of a wind or solar farm. This would open up the renewable energy investment opportunity to everyone, not just corporations and homeowners with with a roof suitable for solar.
The catch is that REITs are limited to certain types of real estate-based assets, and without a new ruling from the IRS, wind and solar farms are out, which is why renewable advocates have been calling for just such a ruling.