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Japan is desperately trying to replace its nuclear-power capacity with renewables. It still has a long way to go.
No other means of storing energy may be able to reach the scale required to run Germany on solar and wind power.
An inexpensive, polymer-based device breaks a record, reaching 10.6 percent efficiency.
A manufacturing method that uses light instead of heat wastes less energy and makes the cells more efficient.
New technology could tip the balance back in favor of some solar-panel manufacturers outside China.
The engineering giant likes the predictability of marine power—which can be “calculated for centuries in advance.”