Singapore Changi Airport will be changing the air handling unit (AHU) and chillers as part of their life cycle replacement works. It is not clear on how much they are going to save in terms of electrical consumption. I will seek clarification with the CAG and update the post.

https://www.changiairport.com/corporate/media-centre/changijourneys/the-airport-never-sleeps/keeping-cool.html?linkId=100000111273179