One Angel Square, Manchester

The Co-operative Group's headquarters uses 80% less energy than a conventional office of similar size, thanks to a double-skin facade that traps warm air between layers, reducing heating costs by 50%. It runs on biofuel derived from food waste, supplying its own combined heat and power plant. The building's natural ventilation system, controlled by automated windows, cuts cooling energy by an additional 30% compared to typical air-conditioned offices.