Cooking Fuel

Part of Alcohol and Distillation

Using distilled alcohol as a clean-burning cooking fuel when wood, charcoal, or gas are impractical.

Why This Matters

Wood and charcoal are the default cooking fuels after collapse, but they have serious drawbacks: smoke causes respiratory disease, gathering firewood consumes enormous labor, deforestation degrades soil and water systems, and open fires are dangerous indoors. Alcohol burns cleanly with almost no smoke, soot, or toxic fumes, making it viable for indoor cooking without ventilation.

Alcohol fuel is renewable. Any community that can grow sugar-rich or starchy crops and operate a simple still can produce its own cooking fuel indefinitely. Unlike petroleum-based fuels, alcohol production requires no drilling, refining infrastructure, or complex supply chains. A village-scale still producing 10-20 liters per day can supply cooking fuel for dozens of households.

The technology for alcohol stoves is extremely simple. A functional cooking stove can be built from a single tin can in under an hour. More refined designs rival the efficiency of modern gas burners. This combination of clean combustion, renewable production, and simple hardware makes alcohol one of the most practical cooking fuels for a rebuilding civilization.

Alcohol as a Fuel: Properties

Ethanol burns according to a simple chemical reaction: ethanol plus oxygen produces carbon dioxide and water vapor. No particulates, no carbon monoxide (when properly combusted), no sulfur compounds.

Property	Ethanol	Wood	Charcoal
Energy density (MJ/kg)	26.8	16-18	29-30
Smoke	None	Heavy	Moderate
Indoor safety	Good	Poor	Dangerous (CO)
Storage	Sealed container	Open stack	Open stack
Renewable cycle	3-6 months	10-30 years	10-30 years
Ignition ease	Very easy	Moderate	Difficult

Ethanol has about 60% the energy density of charcoal by weight, but its clean combustion and ease of use more than compensate. A liter of ethanol (about 790 grams) contains roughly 21 MJ of energy, enough to boil 20+ liters of water.

Minimum Proof for Cooking

Alcohol must be at least 150 proof (75% ABV) to burn reliably as cooking fuel. Below this concentration, too much energy goes to evaporating the water content. Ideally, use 160-180 proof (80-90% ABV) for best performance. This requires at least two distillation runs from a typical fermented mash.

Safety Note

Alcohol burns with a nearly invisible flame in daylight. Always test ignition carefully and mark stoves as “lit” to prevent burns. Never refuel a hot or burning stove.

Simple Alcohol Stove Designs

The Tin Can Stove

The simplest functional alcohol stove can be built from two aluminum beverage cans in 30 minutes.

1. Cut the bottom 25mm from two cans. Use a knife scored against a flat surface for an even cut.
2. Punch 16-20 small holes around the rim of one bottom piece using a nail. These are the burner jets.
3. Cut a small fill hole (10mm diameter) in the center of the same piece.
4. Nest the two bottoms together, jet-holed piece on top, to form a sealed double-wall chamber. Crimp or press-fit to seal.
5. Fill through the center hole with 30-50ml of alcohol.
6. Prime by dripping a small amount of alcohol on the outside surface and lighting it. The heat warms the alcohol inside, which vaporizes and exits through the jets, creating a ring of blue flames.

This stove boils 500ml of water in 5-8 minutes using about 30ml of fuel. It weighs virtually nothing and costs nothing to build.

The Open-Cup Stove

Even simpler: a shallow metal cup or can filled with alcohol and lit directly. Less efficient than a pressurized jet stove but works with lower-proof alcohol (down to 60% ABV). Best for situations where fuel economy is less critical than simplicity.

Use a tuna can, jar lid, or any shallow metal container. Fill to about 10mm depth. Light the surface. Place a pot support (wire rack, three stones, or a metal trivet) above the flame.

The Wick Stove

For sustained, controlled cooking, a wick-based stove provides adjustable flame intensity. Fill a metal container with alcohol. Insert a wick made from tightly rolled cotton fabric through a hole in the lid. The wick draws alcohol upward by capillary action and burns at the tip.

Adjust flame height by raising or lowering the wick. This design uses fuel more slowly and provides better heat control for tasks like simmering or frying. A wick stove with a 500ml reservoir can burn for 2-3 hours on a single fill.

Building a Larger Cooking Stove

For daily household cooking, you need something more robust than a beverage-can stove.

Materials

• Metal container: coffee can, paint can, or fabricated sheet metal cylinder (15-20cm diameter)
• Inner fuel reservoir: smaller can or fabricated cup
• Pot support: heavy wire or rebar bent into a ring with legs
• Fiberglass or cotton wicking material (optional, for wick design)

Construction

1. Build the fuel reservoir. A can approximately 8-10cm diameter and 5-6cm tall works well. If using a pressurized jet design, punch 24-30 small holes around the upper rim and add a central fill hole with a plug.

2. Build the outer housing. The larger can surrounds the fuel reservoir with an air gap for insulation and airflow. Cut ventilation holes near the bottom of the outer housing to supply combustion air. Cut a large opening in the top sized to support your cooking pot.

3. Add a pot support. Bend heavy wire or rebar into a ring that sits on top of the outer housing and supports your pot 20-30mm above the flame. This gap is critical for proper air mixing and complete combustion.

4. Add a snuffer lid. A flat metal disc that slides over the fuel reservoir to extinguish the flame. Never blow out an alcohol fire; always smother it.

Usage Tips

• Fill the reservoir no more than 75% full to allow vapor space.
• Prime pressurized stoves by warming the reservoir with a small external flame for 30-60 seconds.
• Use a windscreen around the stove in outdoor conditions. Even light wind dramatically reduces efficiency.
• Let the stove cool completely before refilling. Pouring alcohol into a hot reservoir can cause flash ignition.

Fuel Economy and Production

A household using alcohol as primary cooking fuel will consume roughly 1-2 liters per day, depending on meals cooked, stove efficiency, and pot insulation.

Annual Fuel Budget

Scenario	Daily use	Annual need	Crop area needed
Supplemental (1 meal)	0.5 L	180 L	~0.1 hectare sugar beets
Primary (2 meals)	1.5 L	550 L	~0.3 hectare sugar beets
Full cooking + heating water	2.5 L	900 L	~0.5 hectare sugar beets

These figures assume 8-10% ABV fermented wash distilled to 80% ABV, yielding roughly 10 liters of fuel per 100 liters of wash. Sugar beets, sugarcane, sweet potatoes, or grain can all serve as feedstock.

Improving Efficiency

Several techniques reduce fuel consumption by 30-50%:

• Insulate the pot. Wrap the sides and lid of your cooking pot with a clay or fabric insulating jacket. Only the bottom contacts the flame.
• Use a lid. Always cook with a lid on. Boiling water with a lid uses half the fuel of an open pot.
• Retained-heat cooking. Bring food to a boil, then transfer the covered pot to an insulated box (hay box cooker). The retained heat finishes cooking without additional fuel.
• Right-size the flame. Once water reaches a boil, reduce the flame. A rolling boil wastes fuel; a gentle simmer cooks just as fast.

Safety Considerations

Alcohol is a flammable liquid and must be treated with respect, but it is actually safer than many alternatives when handled properly.

Storage: Keep fuel alcohol in sealed, labeled containers away from heat sources. Glass bottles with tight caps work well. Store in a cool, shaded location. Alcohol vapor is heavier than air and can pool in low spots; ensure storage areas are ventilated.

Spill fires: Alcohol fires can be extinguished with water (unlike grease or oil fires). Keep a bucket of water or wet cloth near the cooking area. Small spill fires can also be smothered with a damp cloth.

Invisible flames: Ethanol burns with a pale blue flame that is nearly invisible in bright sunlight. Add a small amount of salt to the fuel to create a visible yellow flame, or always approach a stove cautiously and test for heat with a hand held above (not touching) the burner.

Children: Alcohol stoves should be placed on stable, elevated surfaces out of reach of children. The lack of visible flame makes them particularly dangerous around young children who may not recognize the stove as lit.

Denatured fuel: Cooking fuel alcohol should be denatured (made undrinkable) by adding a small amount of a bitter substance. This prevents diversion of fuel stocks for drinking, which can be a serious community management issue. Traditional denaturants include wormwood extract, quinine, or simply marking fuel containers clearly.

Comparison with Other Fuels

Alcohol cooking fuel occupies a specific niche. It is not the cheapest fuel (wood is free where forests exist) nor the most energy-dense (charcoal and animal fats pack more energy per kilogram). Its advantages are cleanliness, renewability, storability, and indoor safety.

For communities in deforested areas, on islands, or in dense settlements where smoke is a health hazard, alcohol fuel can be transformative. It pairs well with other fuels: use wood or charcoal for heavy outdoor cooking and baking, and alcohol for daily indoor meals, medical sterilization, and heating water.

The infrastructure for alcohol production (fermentation vessels, a still, crop land) also produces drinking spirits, medical-grade antiseptic, solvent for chemistry, and lamp fuel, making it one of the most versatile investments a rebuilding community can make.