I do think there is tech out there that is surpressed as it will open up free endless fuel for us the consumer but what good is that to the powers in charge.
Sounds like you have been on one too many conspiracy websites – although that is what solar power gives you…just can’t get enough power from solar to power cars properly based on current tech. A company that could create a cheap/free to use and easy fuel supply would make a fortune – it’s certainly not something that would be suppressed.
The hydro power station makes power during the day when it’s needed and then pumps it back to the top using power from the grid to get it back up there at night when it does not need to be generating – it’s certainly not free power.