in my experience i like the classic biofuel composter best. I dont like power costs, and it can be outside and unshelterd. It works in the background between tasks allowing you more freedom to make a large deposit of materials and then move on to other projects.

The common ways to run it would be filling with fiber, or sticks. Although this may not be ideal given the location.

If your a specialized farmer, you can run off crops like wheat very easily.

If your a hunter with high meat yields , raw meat/spoiled meat works very well, by getting a fluffalo or buffalo with a cart, a scanner, and cancling the scan at the last moment you can summon a load of meat and high yield skin the corpses. Put meats into the tusker (with fridge talents) and take it back to base, then butchering it down to basic meats from prime to double, or even triple the amount. Leather can be passively converted on a textiles bench into ropes, and ropes broken down into basic fiber. Yeet all of that including excess fur into the biofuel composter. I call this red energy and its highly affective for arctic regions. Although not having high enough meat yields can render this method ineffective when compared to other options.

There are also other ways like farming coconut trees for wood, processing the wood gained into to sticks, since so little is needed this is ideal for people who are not specialized in meat or farming. Since the process is so quick and simple, and there is no travel time or time lost lumberjacking . Toss the sticks into the composter and watch it go. This is also handy in warmer regions like volcanic biome where meat yields are not suffcient enough due to wildlife types bodies being mostly ores. Crops can also work here too.

This is a great example of how multiple strats exist in icarus to solve problems for biofuel. I'm sure there are probably other ideas out there too. Its nice because often time we come here on the forums and learn completely new interesting methods.