When renewable energy specialists Juwi claim their new headquarters in Wörrstadt, Germany, is the most energy efficient office building in the world, they might just be right. Built by timber frame experts GriffnerHaus, the 8,500 square metre building boasts a startling array of green features. The external GriffnerHaus envelope is designed to meet the passivhaus standard and consume 80 per cent less energy than demanded in Germany's building regulations.

The new headquarters of renewable energy specialists Juwi in Wörrstadt, Germany, constructed by timber frame experts GriffernerHaus

Solar thermal and biomass energy meet space heating and hot water demand, while over 2,000 square metres of photvoltaic panels on the carpark roof and building itself contribute to electricity needs. The lighting system contains daylight sensors that reduces artificial lighting when sunlight is sufficient.

The triple-glazed canteen wall in which integrated crystalline solar cells provide the dual function of generating electricity and providing shading

The building boasts other green features too: organic waste is fermented in a small biomass plant on site, and Juwi's goal is to consume no less than 200,000 kWh for electricity each year - resulting in energy costs of about ten times lower compared to a typical building. Heat recovery ventilation was also installed. Designed for up to 600 employees, the building was opened in July 2008.

The GriffnerHaus timber frame system being erected

Both wind power and solar PV help to power the building

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