Electricity and gas tariffs are updated every quarter by SP Group. These changes primarily affect those households purchasing electricity from SP Group at the regulated tariff, which is about 53% of households in Singapore. As of the end of June, all other households have switched to an electricity retailer of their own choosing. Given how the electricity plans work, the changes in tariff will affect those purchasing electricity from SP group, as well as those who choose a retailer plan which provides a discount off the regulated tariff. Only fixed plans can insulate you from the fluctuations in the electricity tariff.