HomeBiogas is a company that has created a small biogas system for homes that enables you to generate gas for your house depending on how much waste you have. From table scraps to liquids and even (as seen above) kitty litter, there are a range of waste products that can be broken down into gas for your home. The specific process is a host of bacteria that break down the compost and produce gas. Funny enough one of the byproducts of this process generates a plant fertilizer. As stated in their life cycle diagram, this allows you to feed your plants which you can then cook and recycle again into the HomeBiogas. They’ve already distributed hundreds of these systems and have even been able to distribute them to poorer communities so that they can use it when no alternative is available.
This is their Indiegogo, where they’ve easily raised their target funds.
Tome of Trovius 