-a big central integrated conservatory to gain passive solar heat and provide lots of daylight;
-thermally conditioned air running through earth tubes;
-active solar collection from roof panels;
-a ground source heat pump.
there is a good diagram (too big for this site) here, showing suppliers and systems;Aspects of the plan:
'The combined use of a light weight steel frame structure and a concrete basement generates an efficient interior volume which provides both space and functionality.
Balconies have also been incorporated to provide a link with the outside as well as providing solar shading.
The house is orientated with its longest façade facing south to maximise solar energy utilisation. The service areas in the house (kitchen, bathrooms) are located on the rear or north façade and in the same vertical plan for the purposes of construction efficiency.
The living spaces are open plan in design to maximise ventilation, space and natural light, all regarded as high priorities by today's home buyers. In addition large areas have been set aside for storage and a services stack is provided to facilitate construction and maintenance.