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" The biggest problem is the risk associated with transitioning from pilot line to successful commercial production , " says Ken Zweibel , who heads up thin-film research at the National Renewable Energy Laboratory ( NREL ) in Golden , CO. " There 's a tremendous amount of manufacturing development implicit in that - - and it 's always underestimated by outsiders . This technology , developed by a team at the National Renewable Energy Laboratory ( NREL ) , fills the need of wireless operators to provide higher quality and more reliable service to an increased subscriber base .