Your monthly chilled water bill is primarily based on the amount of chilled water your household uses, multiplied by the prevailing chilled water Usage Charge Rate. 

This usage is measured in kilowatt-hours refrigeration (kWrh), which reflects the cooling energy consumed. 

The bill is calculated using the formula: 

Monthly Usage Charge = Metered chilled water usage (in kWrh) × Current Usage Charge Rate ($/kWrh) 

The current CCS Usage Charge Rate is published at https://mytengah.sg/centralised-cooling/chilled-water-usage-rate.