1. Wepower simply need their product (green power) to grow in price the same speed as growth cryptocurrency marker. Otherwise this will be an uneffective investment.
2. Powerledger. A some kind of app that will deal with the green power which is not working good for now? Nah, that won't work.
3. Bitproperty. The project is not rly about the green power and honestly the idea doesn't seem to be clear. Anyway it reminds me about Horisin state (HST). After the ICO there was a good pump and then the prices rushed down. As people are investing aiming to get a profit then bitproperty also looks unsafe.
I think the main thing they have in common is they are underestimating the conflicting interests of various stakeholders in the energy sector and especially the availability and scalability of different energy sources. It's not just a matter of supply and demand.