Together, solar and wind accounted for about 52% of new capacity additions during the January-June period, compared to 25% during the same period last year, according to new figures from Federal Energy Regulatory Commission.

The strong performance from renewables came within a significantly shrunken overall pie, with the US adding just 3,529MW of new capacity during the first half of 2014, compared to 8,496MW during the same period in 2013.

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