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List of shale gas formations in the United States. Includes major plays like the Barnett Shale and Marcellus Formation.

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.