What Are Biofuels? Promise, Problems, and the Path Forward

Introduction: What Are Biofuels?

Biofuels are fuels derived from the transformation of organic matter—biomass—into energy-dense liquids or gases that can power engines, generate heat, or serve as industrial feedstocks. Unlike fossil fuels, which take millions of years to form and release ancient carbon when burned, biofuels are part of the contemporary carbon cycle: the plants used to produce them absorb carbon dioxide as they grow, creating the potential for significantly lower net greenhouse gas emissions.

The concept is simple in theory: capture solar energy through photosynthesis, convert plant matter into fuel, and burn it for energy. In practice, however, biofuels represent a complex landscape of competing technologies, fierce ethical debates, and fundamental economic trade-offs. They are both celebrated as essential tools for decarbonizing transport and criticized as environmentally destructive distractions from more effective solutions.

This article explores the different types of biofuels, their current and potential roles, the challenges they face, and how various market participants view this evolving sector. This article is an explanation of concepts and information, not financial advice. The information may prone to mistakes.

Part I: Types of Biofuels – Generations and Classifications

Biofuels are commonly classified into generations that reflect their feedstocks and production technologies. This classification matters because each generation carries distinct implications for sustainability, cost, and scalability.

First-Generation Biofuels: The Food vs. Fuel Controversy

First-generation biofuels are produced from carbohydrate- or oil-rich food crops. These are the most mature and widely used biofuels today, accounting for approximately 97 percent of global biofuel production.

Type	Feedstocks	Process	Primary Use
Bioethanol	Corn, sugarcane, sugar beet, wheat	Fermentation of sugars	Gasoline blending (10-85%)
Biodiesel	Soybean oil, rapeseed oil, palm oil, sunflower oil	Transesterification with alcohol	Diesel blending

The United States and Brazil dominate global ethanol production—the U.S. from corn, Brazil from sugarcane. In Europe, biodiesel from rapeseed and other vegetable oils is more common.

The Core Problem: First-generation biofuels create direct competition between fuel and food markets. When crops that could feed people or livestock are diverted to fuel tanks, upward pressure on food prices results—a dynamic that falls hardest on low-income households in developing countries. This “food vs. fuel” dilemma has driven much of the policy backlash against early biofuels and motivated the search for alternatives.

Second-Generation (Advanced) Biofuels: Waste and Residues

Second-generation biofuels are produced from non-food biomass. This category includes:

Lignocellulosic biomass: Agricultural residues (corn stover, wheat straw), forestry residues, and dedicated energy crops (switchgrass, miscanthus)
Waste oils: Used cooking oil, animal fats, rendered tallow
Organic waste: Food processing residues, municipal organic waste

These feedstocks are significant because they avoid direct competition with food production. They also utilize materials that might otherwise be discarded, aligning with circular economy principles.

The technology to convert lignocellulosic material into fuel is more complex than first-generation processes. Cellulose and hemicellulose—the structural components of plant cell walls—must be broken down into fermentable sugars, requiring additional processing steps. While several commercial facilities exist, second-generation biofuels remain less cost-competitive than first-generation alternatives.

Third-Generation Biofuels: Algae and Synthetic Biology

Third-generation biofuels explore alternative biomass sources, particularly microalgae and other microorganisms. Algae offer theoretical advantages:

Higher yields per acre than terrestrial crops
Can grow in saltwater or wastewater, reducing freshwater competition
Do not compete for prime agricultural land

However, third-generation biofuels remain in early stages of development. Technical challenges in cultivation, harvesting, and processing are substantial, and costs remain prohibitive for commercial-scale production.

Emerging Pathways: E-Fuels and Synthetic Routes

Beyond traditional biofuels, a new category of sustainable fuels is emerging. “E-fuels”—also called power-to-liquid or synthetic fuels—are produced by combining green hydrogen (from electrolysis powered by renewable electricity) with captured carbon dioxide. These fuels are chemically identical to their fossil counterparts, making them true “drop-in” replacements that require no engine modifications.

E-fuels are not strictly biofuels (they do not originate from biological sources), but they compete in the same market for sustainable liquid fuels. Their potential role in sectors like aviation is significant, though costs currently exceed those of conventional biofuels.

Part II: How Biofuels Are Used Today

Global Scale

Liquid biofuels account for approximately 4 percent of total transport energy demand globally. While this share remains modest, the absolute numbers are substantial: biofuels reduced global oil demand by an estimated 2.5 million barrels per day in 2024—a meaningful contribution to energy security and carbon emissions reduction.

National biofuel shares vary dramatically, reflecting policy choices and agricultural conditions. Brazil leads with renewable fuels approaching 10 percent of total energy consumption; in other countries, the share is far smaller.

Primary Applications

Sector	Biofuel Role	Key Considerations
Road Transport	Ethanol in gasoline (10-85% blends); biodiesel in diesel (5-50% blends)	Largest current market; electrification is reducing long-term role
Aviation	Sustainable Aviation Fuel (SAF) blended up to 50% with conventional jet fuel	Critical for decarbonization; no near-term electric alternative for long-haul
Maritime Shipping	Biofuels as drop-in replacements for heavy fuel oil	Growing interest; competing with methanol, ammonia pathways
Industrial Heat	Biogas, bioliquids for boilers	Smaller market; electrification alternatives exist

Sustainable Aviation Fuel (SAF): A Special Case

Aviation is widely considered the most important near-term market for advanced biofuels. Unlike road transport, which can electrify, long-haul aviation has no clear alternative to liquid fuels within the next several decades. SAF can be blended with conventional jet fuel without engine modifications and can achieve significant lifecycle emissions reductions.

Current SAF production is minimal relative to demand, but regulatory mandates are driving growth. The European Union’s ReFuelEU Aviation regulation requires 5 percent SAF by 2030—a target that would demand approximately 2.3 million tons annually, compared to current production of roughly 0.24 million tons. This gap represents both a challenge and a significant commercial opportunity.

Part III: The Case for Biofuels – Why They Matter

Energy Security

Biofuels offer a compelling energy security argument: they can be produced from domestic resources, reducing dependence on imported oil and insulating economies from volatile international markets and geopolitical supply disruptions. For countries with agricultural capacity, this represents a strategic hedge.

Indonesia’s B50 biodiesel program exemplifies this logic. By mandating a 50 percent palm oil blend in diesel, the country aims to eliminate diesel imports entirely by 2026, conserving foreign exchange and creating domestic employment. Between 2020 and 2025, Indonesia’s biodiesel mandate saved an estimated $40 billion in foreign exchange.

Economic Development

Biofuel production creates economic activity across the value chain—from agriculture and feedstock collection to processing and distribution. The International Energy Agency estimates that expanded sustainable fuel deployment could create nearly 2 million direct jobs globally by 2035, with particular opportunities in rural and underserved communities.

For developing economies with agricultural capacity, biofuels represent a pathway to value-added processing and industrial development, rather than merely exporting raw commodities.

Sectoral Necessity

Perhaps the strongest argument for biofuels is that certain sectors have no near-term alternatives. Long-haul aviation, maritime shipping, and some industrial processes cannot easily electrify. If these sectors are to decarbonize, sustainable liquid fuels—whether from biological sources or synthetic routes—must play a central role.

Part IV: The Case Against Biofuels – A Sharp Critique

The enthusiasm for biofuels is met with equally forceful criticism. A 2025 report by campaign group Transport & Environment concluded that, globally, biofuel production has increased carbon dioxide emissions by 16 percent on average compared to continuing use of fossil fuels. This striking conclusion reflects the complexity of lifecycle emissions accounting.

The Carbon Accounting Problem

The central critique is that conventional biofuels are not meaningfully low-carbon. Growing crops requires fertilizers (often derived from fossil fuels), farm machinery (burning diesel), irrigation (energy-intensive), and transportation to processing facilities. When all these emissions are accounted for—including land-use change—the net benefit over fossil fuels can be small, zero, or negative.

Land-use change is particularly significant. When forests or grasslands are cleared for biofuel crops, carbon stored in vegetation and soil is released. This “carbon debt” can take decades to repay through subsequent fuel-related emissions savings. Palm oil expansion in Southeast Asia and soybean expansion in South America have been linked to tropical deforestation, undermining the climate rationale for the resulting biofuels.

Inefficiency and Resource Competition

Biofuel production is remarkably inefficient in land use. According to the Transport & Environment report, the same area of land used to produce biofuel for a car could generate 30 times more energy if covered with solar panels. From a land-use efficiency perspective, direct electrification—where feasible—is overwhelmingly superior.

Water consumption presents another constraint. Producing enough biofuel for a car to drive 100 kilometers requires approximately 3,000 liters of water when irrigated crops are used. An electric car powered by solar panels requires just 20 liters for the same distance. In water-stressed regions, these trade-offs are significant.

The Food Price Impact

The diversion of food crops to fuel has measurable effects on global food markets. While quantifying the precise impact is challenging, most experts agree that biofuel mandates have contributed to food price inflation and increased price volatility. This effect is most acute for vegetable oils and corn—commodities central to both food and fuel markets.

The ethical dimension is uncomfortable: in a world where hunger and malnutrition persist, policies that redirect food to fuel tanks face legitimate moral scrutiny. Even if the incremental effect on global food prices is modest, the principle of prioritizing fuel over food raises fundamental questions.

Part V: The Technical Barriers

Beyond policy debates, biofuels face significant technical challenges rooted in the chemistry of the fuels themselves.

The Bio-Oil Problem

When biomass is converted to liquid fuel via processes like pyrolysis, the resulting bio-oil is fundamentally different from crude oil. It contains high levels of oxygen (often exceeding 40 percent by weight), making it corrosive, chemically unstable, and lower in energy density than petroleum fuels.

Raw bio-oil:

Is corrosive: Damages storage tanks, pipelines, and engine components
Is unstable: Thickens and separates over time, becoming difficult to handle
Has low energy value: Requires more fuel for the same output
Produces harmful emissions: High nitrogen content leads to nitrogen oxide (NOx) formation

These properties mean that raw bio-oil cannot simply be used in existing infrastructure. It requires “upgrading”—removing oxygen, stabilizing the chemistry, and meeting fuel specifications—before it becomes a usable product.

The Upgrading Trade-Off

Upgrading solves the chemical problems but creates its own challenges. The processes required to reduce oxygen content to acceptable levels are energy-intensive and expensive. Critically, they also reduce yield: improving quality means sacrificing a portion of the potential fuel.

This trade-off—quality versus yield versus cost—is the fundamental economic barrier to advanced biofuels. Until upgrading costs fall significantly or new conversion pathways emerge, advanced biofuels will struggle to compete with conventional fuels without subsidies.

Catalyst Incompatibility

Another technical hurdle is that existing oil refineries cannot process bio-oils alongside conventional crude without damaging their expensive catalysts. The oxygen and nitrogen in bio-oil act as poisons, rapidly degrading the catalysts that are central to refining operations. This means bio-oils cannot be “co-processed” in existing facilities; they require dedicated processing infrastructure, significantly increasing capital requirements.

Part VI: Can Biofuels Replace Crude Oil? A Realistic Assessment

The Scale Challenge

Global oil demand in 2024 was approximately 100 million barrels per day. Biofuels displaced roughly 2.5 million barrels per day—a meaningful contribution, but only 2.5 percent of total demand. The International Energy Agency projects that under accelerated policy scenarios, sustainable fuels (including biofuels, biogas, and hydrogen-based fuels) could reach 10 percent of road transport demand and 15 percent of aviation demand by 2035.

Even under optimistic scenarios, biofuels will not “replace” crude oil in the sense of taking over the full market share. The physical limits of available biomass, land constraints, and competing uses for agricultural resources make complete substitution impossible.

Where Biofuels Are Likely to Win

Rather than wholesale replacement, the more plausible future involves biofuels occupying strategic niches:

Application	Likelihood	Rationale
Aviation	High	No viable electric alternative for long-haul; regulatory mandates driving growth
Maritime	Moderate	Competing with methanol and ammonia; retrofits possible
Heavy Trucking	Moderate	Electrification possible but infrastructure-intensive; biofuels bridge role
Light Vehicles	Low	Electrification is cheaper and more efficient; role diminishing

The Complementary View

The IEA’s analysis emphasizes that biofuels are not a competitor to electrification but a complement to it. Where electrification is feasible—light vehicles, stationary applications—it is likely to dominate. Where it is not—aviation, long-haul shipping—sustainable fuels are essential.

This complementary perspective suggests a future where the energy system is not built around a single fuel type but rather optimized for different applications. Biofuels will have a role, but not the role crude oil plays today.

Part VII: Implications for Market Participants

For Equity Investors

Differentiated Performance

The biofuel sector is not a monolith. Companies focused on first-generation corn ethanol operate in mature, policy-dependent markets with thin margins. Advanced biofuel companies offer higher growth potential but carry greater technology risk. Integrated oil companies like TotalEnergies are investing in biofuels as part of broader transition strategies.

Company Type	Characteristics	Key Risks
First-generation producers	Stable cash flows; policy-dependent; commodity margins	Policy changes; food price volatility; competition from EVs
Advanced biofuel specialists	High growth potential; technology risk; capital intensive	Commercial scale-up delays; cost competitiveness
Integrated energy majors	Diversified exposure; balance sheet strength; strategic focus	Capital allocation trade-offs; portfolio complexity

Policy Sensitivity

Biofuel economics are heavily influenced by government policies—blending mandates, tax credits, carbon pricing mechanisms, and trade rules. The closure of the UK’s largest bioethanol plant in 2025 following US-UK trade liberalization illustrates how policy shifts can reshape competitive dynamics.

Investors evaluating biofuel companies must assess policy exposure as a primary risk factor.

For Fixed Income Investors

Biofuel project financing involves significant technology and execution risk. Advanced biofuel facilities require substantial capital expenditure and face uncertain commercialization timelines—factors that affect credit profiles. Government support mechanisms (loan guarantees, offtake agreements) can mitigate risk and improve credit quality.

First-generation biofuel producers typically have more predictable cash flows, though they remain exposed to commodity price cycles and policy uncertainty.

For Commodity Markets

Biofuel demand affects agricultural commodity markets significantly. Approximately 40 percent of US corn production is used for ethanol; a substantial share of global vegetable oil supplies goes to biodiesel. Biofuel policies are therefore major drivers of corn, soybean, and palm oil prices.

Key agricultural commodity markets to watch include:

Corn (CBOT: ZC) : Primary US ethanol feedstock
Soybean oil (CBOT: ZL) : Major US biodiesel feedstock
Palm oil (BMD: FCPO) : Primary feedstock for Indonesia and Malaysia biodiesel
Sugar (ICE: SB) : Brazilian ethanol feedstock

Investors in agricultural commodities must monitor biofuel policy developments as a critical supply/demand variable.

For Forex Markets

Biofuel policies affect trade balances and currency dynamics for major producers. Indonesia’s B50 program aims to reduce diesel imports, improving the current account and supporting the rupiah. Brazil’s sugarcane ethanol program affects its oil import requirements and, by extension, its trade balance.

Countries with significant biofuel production capacity may see reduced vulnerability to oil price shocks—a factor that could influence currency stability during energy crises.

Part VIII: The Path Forward – Possibilities and Constraints

Near-Term Outlook (2026-2030)

Current trends point to continued biofuel growth, though concentrated in specific applications:

Aviation: SAF mandates will drive significant investment in production capacity, particularly in Europe and North America.
Road transport: Electrification will limit biofuel growth in light vehicles; biodiesel and ethanol demand will plateau in many markets.
Feedstock evolution: A gradual shift from food-based to waste and residue feedstocks, though first-generation biofuels will retain a substantial share.

Policy as the Critical Variable

The International Energy Agency emphasizes that policy is the key determinant of biofuel growth. Full implementation of existing and announced policies could nearly double sustainable fuel use by 2035; without strong policy, growth will be slower.

Six priority areas for policy acceleration include:

Clear roadmaps and targets aligned with broader energy goals
Demand predictability to attract investment
Robust carbon accounting to ensure genuine emissions reductions
Support for innovation to narrow cost gaps
Integrated supply chain development
Accessible financing, particularly in developing economies

The Investment Gap

Cumulative investment in sustainable fuels between 2024 and 2035 could reach $1.5 trillion under accelerated scenarios. This represents a substantial capital requirement and corresponding opportunity for investors across the value chain—from feedstock production to processing infrastructure to distribution.

The Technology Frontier

Longer-term possibilities depend on breakthroughs that break the yield-quality-cost trade-off:

Catalyst development: More efficient oxygen removal without carbon loss
Synthetic biology: Engineering microorganisms to produce fuel molecules directly
Integration with carbon capture: Creating carbon-negative fuel pathways

Conclusion: Biofuels as Part of the Solution, Not the Whole Solution

Biofuels occupy a contested space in the energy transition. They offer tangible benefits: energy security, economic development, and a viable path to decarbonizing sectors where electrification is not possible. They also carry significant risks: pressure on food prices, competition for land and water, and the potential for limited or even negative climate benefits if poorly implemented.

The evidence suggests that biofuels will not replace crude oil in the sense of taking over the full market share. The physical and biological limits are too binding. Instead, biofuels are likely to play a strategic, complementary role—essential for aviation and other hard-to-electrify sectors, increasingly focused on waste and residue feedstocks, and deployed where they can achieve genuine, verifiable emissions reductions.

For market participants, understanding biofuels means recognizing this complexity. The sector is not a single opportunity but a diverse landscape of technologies, policy dependencies, and regional variations. Success will depend on:

Technology selectivity: Distinguishing between mature, first-generation biofuels and emerging advanced pathways
Policy analysis: Assessing regulatory frameworks and their durability
Supply chain visibility: Understanding feedstock availability and sustainability
Risk assessment: Evaluating technology readiness, commercial viability, and competitive dynamics

As the energy transition progresses, biofuels will likely remain part of the conversation—not as the silver bullet some once claimed, but as one important tool among many in the broader effort to build a sustainable energy system.