Biofuels vs Solar: Numbers Don’t Lie

The biofuels proposition is basically this: use farmland, water, fertiliser, machinery and energy to grow crops, harvest them, transport them, process them into liquid fuel, then burn them in an inefficient internal combustion engine.

Alternatively, we could put solar on a tiny fraction of that land, feed electricity into batteries, and drive. This is why biofuels sit in the same bucket as nuclear power, fossil hydrogen and carbon capture and storage as so-called energy solutions. They’re marketed as climate solutions, but too often they function as delay machines. They keep combustion at the centre of the story. They protect existing fuel infrastructure. They allow companies and governments to pretend we can decarbonise without changing the basic system.

Our World in Data estimates the world uses about 32 million hectares of land to grow crops for liquid biofuels. That’s roughly the size of Poland. Yet if solar panels were put on that area of land, they would generate around 23 times more energy. Enough, in their analysis, to power an entire electrified global fleet of cars and trucks. The difference isn’t small. It’s ridiculous.

That should end the argument for biofuels as a mainstream transport solution. They sound clean because they grow from plants. But the physics is brutal. Plants are not as efficient as solar panels. Solar panels capture vastly more energy from sunlight than photosynthesis does, and electric motors use that energy far more efficiently than combustion engines. EV drivetrains harness 85 per cent of their energy. For petrol engines, its as low as 25 per cent.

Yes, there may be niche roles for genuinely sustainable biofuels: perhaps aviation, or fuels made from wastes and residues that don’t compete with food, nature or Country. They might be relevant where electrification is genuinely hard. But that’s not the same as turning agricultural land or natural habitat into fuel plantations.

Biofuels create huge land-use pressure because they compete with food production. And they drive deforestation and biodiversity loss. This all creates more emissions. When land-use impacts are counted, biofuels can actually produce more CO2 than the fossil fuels they replace.

For Australia, the case for biofuels is particularly weak. We’re one of the sunniest and windiest countries on Earth. CSIRO’s analysis confirms that solar and wind, backed by storage and transmission, remain Australia’s lowest-cost new-build electricity options.

So why would we grow fuel to burn in engines when we can harvest sunlight directly and use it in efficient electric vehicles? Biofuels are not a new energy revolution. They’re an old combustion story with a green label stuck on the bowser.

The future of transport is not more burning. It’s electrification: renewable energy, batteries, public transport, active transport, better planning, lighter vehicles, and less wasteful movement of people and goods.

We need to stop pretending every “alternative fuel” is equally serious. Some are essential. Some are niche. Some are distractions. Biofuels aren’t the answer to road transport. They’re land-hungry, inefficient, contested, and too easily captured by industries that want to keep the world burning stuff.

From Our World In Data.