Singapore has zero native oil/gas. Over 95% of electricity is from natural gas. With LNG terminals, we have access to the global market. We will have to pay the full international going rate, and that price is likely to be high.
Even if the Strait of Hormuz opens in 24 hours, there has been damage to LNG infrastructure which will take months and even years to restore. This global shortfall is sticky, not resolved in 24 hours.