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A mechanical device mimics how fish harness energy from water flow.
Recent efforts show hope for regional transmission planning for renewable power.
A design that draws on jet engine technology could halve the cost of generating electricity from wind.
Improved dyes and electrolytes could make the Grätzel solar-cell design more practical.
A system that detects gusts before they arrive reduces wear, boosts output.
Falling oil prices mean tough times for renewable energy, but experts expect the industry to bounce back.
BP’s chief scientist, Steven Koonin, says cutting greenhouse emissions will take major changes.