Looking at the design, I believe they should also be able to generate electricity from the setup. They have salty water with an insulated spacer to retain heat

Looking at the design, I believe they should also be able to generate electricity from the setup. They have salty water with an insulated spacer to retain heat on the evaporation layer to make it more effective in removing water. This in turn is creating a saltier layer of water that diffuses into the lower layer via holes in the spacer. That means there is a salinity gradient between the top most layer and the bottom layer which should have an electric potential. Neat.