How to Turn Your Lawn Clippings Into Free Fuel

How to Turn Your Lawn Clippings Into Free Fuel

How to Turn Your Lawn Clippings Into Free Fuel


Having a lush, green lawn is the dream for many homeowners. However, keeping your lawn maintained requires regular mowing, which produces piles of grass clippings. While some choose to leave clippings on the lawn or dispose of them, did you know you can actually turn those grass trimmings into free fuel?

Converting lawn clippings into usable energy is a process called gasification. With some basic equipment and a bit of time and effort, I can gasify my lawn clippings into a renewable fuel source. This homemade fuel, called producer gas, can then be used to power engines, heaters and more, providing free energy from waste.

In this article, I will provide a step-by-step guide on how I gasify my lawn clippings to create producer gas fuel. I will cover the entire gasification process, from gathering supplies to running a gasifier. By the end, you will have the knowledge to start gasifying lawn clippings and making your own free fuel.

Gather the Necessary Supplies

The first step is gathering the equipment and materials needed to build a gasifier unit. Here are the main items I need:

  • 55-gallon metal drum – This will act as the main gasifier chamber. Make sure it is not a plastic barrel, as it needs to withstand heat.

  • Metal grate – This will sit inside the drum to hold the fuel above the air intake.

  • Piping and valves – Necessary to route the gas out of the drum and to where it will be used. I recommend steel piping.

  • Air blower – Drives air into the gasifier unit. A small electric blower or vacuum works well.

  • Fuel source – Dry lawn clippings are perfect. Avoid clippings with pesticides or weed killers.

  • Protective equipment – Leather gloves, safety glasses, etc. The gasifier runs very hot.

Optional items like gauges and filters can enhance efficiency but are not essential. Focus first on the key components listed above.

Build the Gasifier Unit

With the supplies ready, it’s time to construct the gasifier unit. I follow these key steps:

1. Cut an Opening in the Drum

Using an angle grinder or drill, I cut an 8-10 inch opening in the side of the 55-gallon drum near the bottom. This opening will be used to feed fuel into the gasifier.

2. Add the Grate

Next, I place the metal grate inside the drum, positioning it about 1/3 of the way up from the bottom. I weld or bolt it securely in place. The grate will hold the fuel and allow air flow.

3. Install Piping

I add piping to route the gas out of the drum. I install a pipe through the lid of the drum, sealing it so gas cannot escape. I add valves to control gas flow.

4. Attach Air Blower

Lastly, I mount the air blower near the bottom intake opening, ensuring it can force air into the drum. This provides the oxygen needed to produce gas through pyrolysis.

Prepare the Gasifier for Use

Before firing up the gasifier, a few simple preparation steps help ensure proper operation:

  • Load dry lawn clippings or other biomass fuel into the drum, up to the grate. Avoid packing it too densely.

  • Seal any air leaks around the piping, blower and openings. Leaks can impact performance.

  • Check that valves in the gas output line are closed.

  • Ensure the exhaust area is properly ventilated.

Taking these preparatory steps allows for safe and effective operation.

Fire Up the Gasifier

Here is the process I use to start generating producer gas:

1. Light the Fuel

I ignite the lawn clippings or other biomass inside the drum using a torch or other heat source applied through the intake opening.

2. Let the Fuel Char

Once lit, I let the fuel undergo pyrolysis, where itchars and releases volatile gases without igniting. This takes 15-30 minutes.

3. Start the Air Blower

When pyrolysis is complete, I start the air blower, forcing air into the bottom intake. This creates the producer gas through gasification.

4. Open Output Valve

With air flowing through the fuel, I slowly open the gas output valve, allowing producer gas to flow through the piping to where it will be combusted.

5. Adjust Air Flow

I monitor the air blower rate and color of the gas output to ensure proper gasification. A blue flame shows complete combustion is occurring.

6. Add More Fuel

As the fuel level drops, I periodically add more dried lawn clippings or biomass through the input opening, keeping the drum full.

Use the Generated Producer Gas

Once my gasifier starts generating a steady stream of producer gas, I can use it for a variety of purposes:

  • Run a generator to produce electricity
  • Fire a burner for heat or cooking
  • Power an internal combustion engine
  • Heat water using a gas-fired boiler

The applications are extensive. My homemade fuel can displace other costly or non-renewable fuels in many devices.

To utilize the gas, I pipe it directly to the intake of the engine, burner or other equipment. I ensure the devices are adjusted for producer gas operation.

Safety Tips

While gasifying lawn clippings is straightforward, some key safety tips should be followed:

  • Producer gas is flammable, so avoid sparks or flames near the output.
  • Gasifiers operate at high temperatures. Wear protection and avoid contact with hot surfaces.
  • Do not breathe producer gas, as it contains carbon monoxide. Only pipe it to combustion devices.
  • Situate the gasifier outdoors or in a well-ventilated area.
  • Inspect for leaks and fix any worn or damaged components.

Using caution allows me to safely generate this free renewable fuel.


Turning lawn clippings into usable producer gas is an ingenious way to create a free, sustainable fuel source. By constructing a simple gasifier and following the steps outlined in this article, anyone can start gasifying yard waste into energy right at home. Not only does it reduce waste, but it saves money otherwise spent on electricity, propane or gasoline. With a bit of effort, those piles of lawn trimmings can be converted into free renewable fuel using gasification.