[octacat]

Sadly it is not even means of intergalactic hydrogen. The game is over once the hydrogen in the core is fused :( Tidal energy would probably never go mainstream to cause major issues (too easy to break during the storms, not all places are good to build it, other types of energy sources are more attractive).

The whole article sounds like something that fuel companies would sponsor to make the renewable energy look bad (look, tidal is not renewable too, so buy our gas/oil).