US residual fuel oil supplies are dwindling and face multiple challenges in 2025 because of reduced global inventories and a persistent backwardation in the domestic market.
Total US inventories of residual fuel oil fell to a historic 42-year-low multiple times during 2024, including nine instances in the fourth quarter alone, according to Energy Information Administration (EIA) data. Supplies hit rock bottom at just under 23mn bl in the week ending 29 November, down by 12pc year-on-year.
Despite the shrinking supplies, the US market has shown little reaction. Throughout 2024, ICE Brent futures — the basis for US residual fuel oil — remained in backwardation between the front and second month, averaging $0.60/bl. This is nearly double the full year 2023 backwardation average of $0.39/bl.
The persistent backwardation of the fuel oil curve means inventory figures lack the drive to encourage wholesalers and retailers to make purchases in anticipation of future demand, traders said. The diminishing future value results in potential losses for traders who are considering purchasing spot barrels for storage as forward prices are lower than current spot prices.
Residual fuel oil is primarily used as a maritime fuel for large ships, a fuel for backup power generation and for various industrial purposes. In the US it is often refined further into other road fuels.
The production of US residual fuel oil has been steadily increasing in recent years, beginning even before implementation of the International Maritime Organization's 2020 global rule imposing a 0.5pc sulphur cap on marine fuels. However, output averages over the past four years remain well below pre-2019 levels.
Since the US imposed sanctions on Russian fuel exports in February 2023, weekly residual fuel oil imports into the US have averaged just over 100,000 b/d, nearly half of the previous two-year average at 196,000 b/d. Mexico has now become the largest fuel oil exporter to the US, accounting for nearly 33pc of all US fuel oil imports over the past two years, claiming the top spot from Russia.
Planned expansion of Mexico's refinery infrastructure may crimp US supplies, however. Mexican state-owned Pemex's 400,000 b/d Dos Bocas refinery — which is still in the start-up process — would take a greater share of Mexico's Maya crude. Maya crude yields a significant portion of fuel oil when refined. This would leave less Maya bound for the US, which has taken nearly 60pc of Mexico's Maya over the past three-years, according to Vortexa data.
Pemex is also adding two new coker units to its Tula and Salinas Cuz refineries as part efforts to become more self-reliant and add an additional 168,000 b/d of road fuel output. Coker units process fuel oil to turn it into higher value road fuels, which would curtail flows to the US.
Refinery maintenance involving a few US crude distillation units is set to begin in January, which could further limit domestic fuel oil production. The National Weather Service's winter forecast for the east coast is expected to be warmer than usual, likely leading to reduced demand for both high-sulphur fuel oil used in power generation and low-sulphur blending components.