For some great Archicad resources try this web site
The Fifth Estate reports nil cost for the initial outlay for solar panels from which the cost can then be recouped by energy buying.
This is an opportunity to increase the uptake for solar.
Using mushroom roots as an insulation material is both cost efficient and a renewable resource for the building industry. Paul Stamets has even developed a patent for a non-sporing mycelium to attracts termites and eventually kill them once ingested. Read more about Evocative and there developments in mushroom based insulation