What is the lag time between fuel price changes and tariff adjustments in Singapore?

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Singapore’s tariff adjustments lag fuel price changes by one quarter
Singapore’s regulated electricity and gas tariffs are reviewed quarterly based on fuel costs from the previous quarter. That means changes in fuel prices in one quarter show up in electricity tariffs in the next quarter. EMA highlighted this in the case of regulated electricity tariffs for April to June 2026, which only reflected the fuel price rise from Feb 28 to Mar 15, 2026.
Tariffs are reviewed quarterly using prior-quarter fuel costs
EMA said Singapore’s regulated electricity and gas tariffs are reviewed quarterly, with the calculation tied to fuel costs from the previous quarter. This quarterly review cycle creates a time gap between when fuel prices change and when households see those changes in their utility bills.
Fuel price shifts appear in the following quarter’s electricity tariffs
Because the tariff revision uses the earlier quarter’s fuel costs, fuel price changes in a given quarter do not affect that same quarter’s regulated electricity tariffs. Instead, they feed through to the next quarter’s tariff adjustment, which is why households face higher rates later than the initial fuel price spike.
Example shows the effect of the one-quarter delay in 2026
EMA noted that regulated electricity tariffs for April to June 2026 rose slightly because they only included the fuel price increase from Feb 28 (when the Middle East conflict started) until Mar 15, 2026. The regulator’s explanation illustrates how an earlier fuel shock is incorporated into tariffs with a quarter’s lag rather than immediately.
The same review timing applies to gas tariffs
The same “previous quarter” approach applies to regulated gas tariffs as well, since both electricity and gas are reviewed quarterly by EMA. As a result, households experience tariff changes after the fuel price movement has already occurred in the prior quarter.

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What is the lag time between fuel price changes and tariff adjustments in Singapore?

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