After six years and significant federal investment, a promising kelp-based biofuel research program has ended without producing a commercially viable energy source, raising questions about the sustainability of government-backed energy alternatives when market demand fails to materialize.
The Department of Energy's MARINER program, which supported marine scientist Scott Lindell at Woods Hole Oceanographic Institution in Massachusetts, concluded in 2024 after years of research into hydrothermal liquefaction—a process using heat and pressure to convert seaweed into fuel for ships and aircraft. Since the funding ended 2 years ago, federal research opportunities have become fewer and delayed, underscoring a persistent pattern: government backing for speculative energy projects tends to evaporate once initial funding cycles complete.
The Research Promise
Lindell and his team made legitimate scientific progress. The researchers bred kelp varieties that in some cases produce up to three times more biomass than conventional strains, and his lab maintains a collection of over 2,600 sugar kelp strains from across New England. The hydrothermal liquefaction process itself is sound—it can convert organic material into liquid fuel while producing fewer greenhouse gases overall than petroleum-based fuels.
Lindell argued for the necessity of the work, stating: "We need other sources of energy that are sustainable, we can't just rely on petroleum," and noted that "there's hardly anything simpler, or anything that grows quite as fast and as sustainably, as seaweed."
Yet the fundamental challenge remains unchanged since the 1970s, when a similar feasibility-testing venture began and was swiftly terminated once oil prices stabilized. Lindell himself acknowledged this stagnation: "I don't think things have changed incredibly since the first oil crisis."
The Market Reality
What the research community has not overcome is basic economics. A middle market for kelp-based biofuel has yet to materialize. Current aquaculture operations remain small, with farms supplying kelp primarily to restaurants, cosmetics companies, and fertilizer producers. Oliver Dixon, a shellfish farmer in Point Judith, Rhode Island, harvests approximately 10,000 pounds of kelp monthly but sells almost entirely to local restaurants and seafood markets. His 9-acre farm is hundreds of times smaller than what would be needed for biofuel production.
Dixon's experience illustrates the problem plainly: "The buyers come in and out, it's pretty discouraging." Without proven demand from the energy sector, he has no plans to expand—a rational business decision that no amount of government research funding can override.
Bren Smith, co-founder of GreenWave, a nonprofit supporting ocean farmers, identified the core issue: kelp is currently more economically viable in cosmetics or food products than in fuel, which remains one of its lowest-value uses. Smith warned against repeating past mistakes, noting the futility of "competing with the most technically advanced, subsidized industry on the globe, the fossil fuel industry."
Regulatory and Environmental Constraints
Even if market demand emerged, regulatory barriers would impede rapid scaling. In the United States, coastal waters are largely prioritized for recreation, fishing, and conservation, making permits for large aquaculture projects difficult to obtain. Dixon cannot even keep his farm infrastructure in the water year-round, requiring him to remove lines and anchors each spring and reinstall them in the fall.
Moving operations further offshore could enable larger farms but introduces new complications. Hauke Kite-Powell, an engineer and economic analyst at Woods Hole, cautioned: "We don't yet have a full understanding of what all the ecological side effects of very large-scale ocean farming might be." Potential risks include entangling marine animals and farmed kelp competing with other marine life for nutrients.
By contrast, countries in Asia often prioritize extensive seaweed farms covering entire bays, demonstrating that regulatory environment—not scientific capability—determines whether such ventures can scale.
Why This Matters:
The kelp biofuel case illustrates a recurring pattern in energy policy: government funding for exploratory technologies produces research outputs but cannot create markets. When the MARINER program ended after six years, federal support dried up, revealing that sustained commercial viability was never established. The Department of Energy's inconsistent interest in biofuels—setting out to develop kelp-fuel tools in 2016, then reducing support after 2024—reflects the fundamental weakness of government-directed energy development: it substitutes political cycles for market discipline. Until kelp-based fuel becomes economically competitive with alternatives without subsidy, or until regulatory barriers to ocean farming are substantially reduced, private investment will remain minimal. The research itself may eventually prove useful, but expecting government funding alone to overcome market economics and regulatory constraints represents a misallocation of public resources better deployed elsewhere.