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A startup reports progress on a battery that stores more energy than lithium-ion ones.
A novel low-temperature electrolyte could make solid-oxide fuel cells more practical.
Researchers have found a cheap and easy way to store the energy made by solar power.
A large-scale tidal-power unit has started up in Northern Ireland.
Replacing sapphire with silicon could lead to more-affordable LEDs.
An advance makes the conversion of heat to electricity practical.
NASA prepares to test a satellite that can be propelled by light particles from the sun.
Researchers consider plug-in hybrids charged by stationary solar arrays a better bet.
New technology could provide a way to harness wave energy.