His analysis showed that this approach would be less expensive than the current energy supply system. (medsocietiesforclimatehealth.org)
After that, things get a little more expensive and complicated, like putting alternative energy supply systems into your buildings. (entrepreneur.com)
The lectures addressed a well - designed mix of highly technical issues for sustainable and conventional energy supply systems, financial / cost analysis, and the relevant social implications. (britishcouncil.jp)