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The majority of power technology innovations and breakthroughs in 2013 occurred in the renewables sector. Power-technology.com lists some of 2013's major innovations and breakthroughs in energy technology. Ultra-efficient photovoltaic designs A four-junction solar cell, developed by Germany's Freiburg-based Fraunhofer Institute for Solar Energy Systems, Soitec and two other research organisations, achieved a record breaking 44.7% efficiency converting sunlight to electricity in September 2013.

Whyd, a really breakthrough voice-controlled speaker claiming to deliver high-quality surround sound at a retail price of $499.

The Internet has radically transformed the way we get around. Getting ready for a revolutionary breakthrough in vehicular navigation and safe driving especially for highways, @carlo-ratti-associati and Italian highway agency ANAS are all set to design a Smart Road system. Check out the story

'Light' and 'vision' are like two sides of the same coin. Read here about the breakthrough that can benefit the visually challenged en masse. Do give us your feedback...

Developed by an international team of researchers from the Universities of Oxford, Exeter and Münster, the chip contains a network of artificial neurons and synapses that respond to light, rather than electrical inputs. This allows the chip to mimic the behaviour of human neurons and their synapses.