The Straits Times Electricity and gas tariffs for households in Singapore to increase for second quarter The average monthly electricity bill for families living in four-room Housing Board flats will increase by $5.62 before GST, said SP Group.PHOTO: ST FILE https://str.sg/JCp2 They can read the article in full after signing up for a free account. Share link: Or share via: Sign up or log in to read this article in full Sign up All done! This article is now fully available for you Read now Get unlimited access to all stories at $0.99/month for the first 3 months.