Mandate for all new public construction to incorporate renewable energy

I would like for all government funded structures to incorporate renewable energy sources where ever possible or practical. The principles of passive solar heating are well known and should be part of the planning of any new buildings or remodeling of older structures. Most public buildings operate primarily during daylight hours, when solar energy sources would be most productive. Use of other renewable energy sources as part of public structures could also be a test of the viability af systems and will help to spread their use. By increasing the market use of these systems the price per installation and per energy unit produced would become reduced. This would also help to decentralize energy production, eventually reduce taxes needed to pay for public energy use, and help reduce dependency on fossil fuels by both foreign energy sources and influence by large corporate energy providers.