Japan's Richest Man Outlines Renewable Energy Plan

itwbennett writes "Speaking at the launch of his Japan Renewable Energy Foundation, Masayoshi Son, founder and CEO of Softbank, outlined a plan to rebuild Japan's energy infrastructure. Son said the country could shift to renewable energy sources for 60 percent of its electricity requirements over the next two decades. He called for a 2 trillion yen (US$26 billion) 'super grid' across the country, and underwater off the coast, that would zip electricity around cheaply and efficiently to meet demand."

Comments

Re:What could possibly go wrong?

[Rei]

AC under seawater is difficult. DC under seawater is simple. Both AC and DC suffer from resistive losses in the cable, but AC also suffers from reactive losses, which are far higher underwater. You can even do earth return, either a monopolar transmission or an uninsulated (and thus cheaper) return wire. And no, it's not dangerous; it's already used in quite a few places.

What is being proposed here is a nationwide HVDC grid, which is an especially important thing in Japan where they have basically two separate AC grids operating on different frequencies. This prevented the southwest from sharing power with the northeast after the tsunami, causing the northeast (including Tokyo) to suffer rolling blackouts for a long period of time. DC can allow power sharing between the two grids.

Basically, it's a proposal to allow power generated in any part of the country to be consumed in any other part, with minimal losses. And seeing as the country is the size of California, the weather in one part of the country can be very different than the weather in another part of the country, so it's a boon to not just stability and efficiency, but renewables capacity as well. Peaking plants and energy storage systems anywhere in the country can likewise support the entire nation.

I certainly hope Japan leads the way on this. Europe has been moving in this direction at a moderate pace, but the US only at a snail's pace. It needs a big push.