Source? I've lived in Singapore all my life and have not heard of this. There was an outage on the 31st of March[1], and parliamentary discussion after that[2] doesn't mention any of what you said.
[1]: https://www.channelnewsasia.com/singapore/changi-airport-ter...
[2]: https://www.mha.gov.sg/mediaroom/parliamentary/oral-reply-to...