HDB 4-room: SP’s average of 391.33 kWh a month

$121.95 a month with GST, Oct to Dec 2026

Electricity at 28.59¢ a kWh

$111.88

GST 9%

$10.07

$14.16 less a month than the same use in Jul to Sep 2026 (31.91¢ a kWh before GST). Each 100 kWh more adds $31.16 a month with GST.

From 1 Jan 2027, at our estimate of the next tariff (30.68¢ before GST), about $130.87 a month with GST, $128.10 to $133.63 if oil holds at its latest price. SP hasn’t announced it yet. How we estimate it

U-Save: eligible HDB 4-room households get $150 in October 2026 and $150 in January 2027, credited to their SP Services utilities account. $150 is about 1.2 months of this electricity bill. Who gets it

Bill = kWh × SP’s tariff before GST, plus GST, to the cent: the sum SP uses for its own average bills (ours match all 176 of SP’s figures we checked). This is the electricity part of your SP bill; water and gas, where you have them, are charged on top.