Every increase in electricity tariff is explained by Singapore
Powers as due to an increase in oil prices because oil is the main
resource used in generating electricity.
In ST today, we see a reply by Island Power Company:
...
Although achieving full retail contestability of the retail
electricity market will be an important achievement, the real key
to realising the benefits of the deregulated electricity market is
a fully liberalised, competitive natural gas industry. The reason
is simple: Most electricity in Singapore is produced by
plants that use natural gas and most of the marginal cost of
producing electricity from such plants is the cost of natural
gas.
...
- full reply here
So, what exactly do we use to generate electricity?