These water figures are comparisons, not Batam measurements

The BBC attributes both comparisons, and the next sentence says it is unclear how much water or electricity the Batam centres use. The 300,000-gallon figure restates an Environmental and Energy Study Institute estimate that a medium-sized US data centre can use up to about 110 million gallons a year, roughly the annual use of 1,000 households. That is a ceiling for one size class, not a measurement of a typical centre or of Batam. The 50MW comparison is Bank Negara Malaysia's illustration: about 22,000 households of electricity and 2,200 of water per day, using assumed household use and a water-usage effectiveness of 2.2. It is not a meter reading from the island.