Dr Keung says "the payback period for the solar energy then (in 2009) was 25-30 years, which is a long time. Today, if we retrofit a same building to make it a zero energy building, the payback period is just 7-10 years".
PHOTO: ARTHUR LEE
BUILDING and Construction Authority (BCA) CEO John Keung believes there are three ways Singapore can further improve its green building standards.
First is the use of more renewable solar energy to power buildings - after all, the sun is the most promising and feasible energy source for...