Case study: Naturgas Energía LEED-certified head office for Naturgas Energía Working in an attractive, sustainable environment – was the goal for Naturgas Energía's new head office. The Spanish energy group has recently moved to a listed historical building in Bilbao. For the property's renovation they consciously called on sustainable, ecological technology, among which also energy-efficient ETAP lighting. Their efforts were rewarded with a

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