Simon Speigner is a pioneer of sustainable, energy-efficient building in Austria. His practice sps architekten focuses on creativity and innovative solutions to produce buildings that are both aesthetic and sustainable. Text in English and German. Simon Speigner is a pioneer of sustainable, energy-efficient building in Austria. His practice sps architekten focuses on creativity and innovative solutions to produce unconventional, customer-orientated buildings that are both aesthetic and sustain­able. The practice has won numerous wood-building awards and state prizes, for instance for the oh456 plus-energy office building and cultural power plant in Thalgau. Text in English and German.