I suppose you're right. I wondered about the salty water reference myself. Supposedly rain is lacking minerals because it's pure water, unlike spring water which contains minerals that are necessary to ones health. So adding salt would create an ionization effect that may be missing from real rain water, and is skewing their claims of generating electricity. I've always thought that solar panels are a weak way of creating electricity, compared to attempts to increase efficiency of burning fossil fuels which is a proven technology. Reduce energy losses by converting more heat to energy in the burning of fossil fuels and the rewards are many times greater than fooling around with solar panels.
There is a lot of Obama bucks in non fossil fuel energy development.