The Leuphana University of Lueneburg changed to renewable energy supply with the first climate-neutral energy balance for heat, electricity, cars and business trips in 2014. The campus heating network is based on 2 bio-methane-powered combined-heat-and-power units of 525 kW el. each. A total of 720 kW photovoltaics (east, west and southern faced PV, matching the campus grid connection) with 95% self-consumption covers > 20% of the electrical demand. The new central building comprising a large auditorium, seminar rooms, bureaus, a cafeteria, machine hall and space for exhibitions and events is designed to make use of low-grade heat at 58 °C with an internal cascade to achieve 25 °C return line temperatures. The aim is optimized integration of short and long term heat storage installations. Its special architecture and façade design significantly lowers cooling demand (~ 2.5 kWh/m²a), modern lighting systems and user integration allow for superior overall energy efficiency.