Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
I found these figures for an estamate on Japan's renewables potential:

Technology Review: The Authority on the Future of Technology

The ministry estimates that 150 gigawatts of solar could be installed on public, commercial, and industrial buildings and on low-value urban lands such as capped landfills and abandoned farmlands. ...Wind power potential, meanwhile, was estimated at 280 gigawatts onshore and 1,600 gigawatts offshore. Geothermal and small-scale hydropower could generate 14 gigawatts.

If that can be realised sometime, solar could have a similar "peak-shaver" role as currently in Germany, and wind could give the bulk, but geothermal and small-scale hydro may not be enough for balancing.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Fri Jun 22nd, 2012 at 01:52:14 PM EST

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