Yet another creative variant of solar. Japan is a country where only 11.65% of the land is really suitable for agriculture. They don’t have the land to spare for big installations. Particularly with the loss of the Fukushima area, a loss that was both physical and psychological. Solution: take solar to sea.
Here is another electricity generating technology I first covered in SR about 11 years ago. It made a splash at the time then disappeared. Now it has come back, and it has fascinating implications. This is yet another example of what happens where carbon energy is no longer thought of as the only way.