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Whether you want to be off the grid or simply prepared in the event of a sustained power outage, you are going to need an alternate source of energy at some point. A generator would seem like the practical solution to the energy problem, but what if you don’t have access to fuel?
A wood/biomass gasifier can be the solution to this problem, and there is a great step-by-step tutorial on building your own gasifier. If you re-purpose metal scraps and improvise, this can be a fun, low-cost build. My generator is pretty minimal at 15 hp, but if you follow the guidelines in the tutorial you could build a gasifier to power a 160 hp engine.
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This instructional has plenty of tips for a successful build, as there aren’t a lot of different parts to a gasifier, just careful (and airtight!) assembly. Fun fact: this tutorial was put together by a 15 year old!
How To Build a Wood-Gasifier (Power for when SHTF)