The CLEAN ENERGY building will demonstrate green concepts by its functions and by its fabric. Its starting point will be the National Green Specification, and it will address strategic issues and show practical examples of energy and environmental conservation such as zero or minimal carbon low embodied energy in materials low energy in use low waste generation long durability recycleability. It will be designed to be an educational resource demonstrating alternative technologies such as solar, wind and geothermal power as well as being a working example of CHP. The theories shown will be supported by the practical reduction of running costs through the use of solar power and wind generation, and the maximum use of daylight even in the underground parts. The space in the building will be adaptable and flexible to allow multifunctional use by the current residents and be capable of radical change in the future.