Houston bunker costs have surged to the highest level in six months amid rallying US oil prices and fuel terminal congestion.

The Baltic Exchange’s assessment of Houston spot prices for very-low sulphur fuel oil (VLSFO) rose to $600 per tonne on Wednesday, the highest price since July 18.

The price represents a 5.6% jump since this time last week.

The assessment is set by a panel of bunker companies.