NASA-funded experts from the National Laboratory of the Rockies have proposed five alternative fuels to address a looming aviation energy crisis. The study aims to reduce dependence on imported oil as global demand is projected to climb significantly by mid-century.
The climb to 165 billion gallons by 2050
The aviation industry is facing a massive scaling challenge. According to the report, global jet fuel demand is expected to rise from just over 100 billion gallons in 2025 to 165 billion gallons by 2050. This projected surge is occurring against a backdrop of price volatility and supply constraints in traditional markets, making the search for domestic alternatives a matter of economic security.
This shift is part of a broader global trend toward energy independence. by diversifying away from conventional Jet A and Jet A-1 fuels, the United States can leverage domestic feedstocks and electricity, reducing the vulnerability of the aviation sector to geopolitical shockks that often impact imported crude oil prices.
Why sustainable aviation fuel only hits 1% of global use
Sustainable aviation fuel (SAF) is currently the most mature alternative identified by the National Laboratory of the Rockies. it is highly versatile, as airlines can blend SAF with conventional Jet A at concentrations up to 50% without needing to modify existing aircraft or airport infrastructure. Most current SAF is derived from alcohol-based feedstocks, greases, animal fats, and used cooking oil.
Despite this readiness, the report says SAF accounts for only about 1% of global aviation fuel use. The primary bottlenecks are limited biorefining capacity and high production costs. However, the potential is vast; the National Laboratory of the Rockies estimates that available feedstocks could eventually support an annual production of 132 billion gallons, which would cover roughly 80% of the 2050 global demand.
The infrastructure hurdle for liquid hydrogen and LNG
While SAF fits into existing pipes, cryogenic fuels—including liquid hydrogen, liquefied natural gas (LNG), and liquefied ethane—require a total overhaul of aviation logistics. these fuels must be kept in insulated tanks at extremely low temperatures to remain liquid, meaning they cannot replace Jet A in current aircraft designs.. To make these viable, aircraft manufacturers must certify new designs and regulators must establish global distribution standards.
There is already movement on the ground to bridge this gap. The Federal Aviation Administration (FAA) is currently collaborating with the National Laboratory of the Rockies to prepare airports for future hydrogen use. Liquid hydrogen is particularly attractive for regional aircraft due to its high energy-to-weight ratio and zero carbon emissions during flight, while LNG is viewed as a lower-cost option given the abundance of natural gas in the U.S.
Jet X and the quest for cleaner airport air
The most experimental option in the NASA-funded study is a fuel called Jet X. Unlike the cryogenic options or SAF, Jet X focuses on new liquid hydrocarbon chemistries. Researchers are developing this fuel to improve overall fuel economy and reduce the formation of contrails, which contribute to atmospheric warming.
Beyond efficiency, Jet X aims to improve local air quality for communities surrounding airports by reducing harmful aromatics.. While it sits much earlier in the development cycle than SAF or LNG, it represents a long-term strategy to make aviation more environmentally sustainable from a chemical level.
The government decisions Kristi Moriarty says are critical
The transition to these fuels is not merely a technical challenge but a political one. Kristi Moriarty, a senior vehicle and infrastructure analysis researcher at the National Laboratory of the Rockies, notes that government decisions are the primary driver for whether companies invest in new production pathways or SAF plants. Without clear policy signals, the private sector may be slow to build the necessary capacity.
Several critical questions remain unanswered in the current analysis. The report does not specify the exact subsidies or tax incentives required to bring SAF costs down to parity with Jet A, nor does it provide a timeline for when the FAA might finalize the global standards needed for cryogenic fuel distribution. Furthermore, the study focuses on production potential but offers little detail on the specific land-use conflicts that might arise from scaling biomass and algae feedstocks to meet the 132-billion-gallon target.
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