Is the total RF cost for materials listed there a function of time (as in, RF per second operation, or RF/t) or a function of jet fuel volume produced (as in RF per bucket of jet fuel)? Either way you go, feeding it into a gas turbine would more than double your investment, so you could run it at a net gain of power. Hm...does Minechem add worldgen? Might tack it on when I get home just to see what I can do with it. I remember using it a little in the 1.5 days to make party drugs, especially cocaine, for shits and giggles, but something more substantive would be nice to screw around with.
RF cost is total per bucket of jet fuel, which is what all the numbers are for. Note that unless you've set it to hard (and I've never actually seen someone set it to non-normal but whatever) you get several buckets of jet fuel per ingredient, meaning you'd require several times the RF as a starting cost, I've just added a second sheet out of curiosity, rounds all the item requirements up to the nearest integer as that's what you'd actually need. Fusion reactors are annoying to build though, large multiblock structure (13x5x13) that several hundred blocks to complete, luckily it's only 1 of 2 custom blocks and they use an in-world blueprint to make it easy, need to decompose a bunch of stuff first though to get things like the lead or beryllium needed to construct them, annoying to automate too, basically just got to play around until you figure out the sidedness and how to get IO working.
Minechem does technically add worldgen, it adds uranium ore to the world, however the stuff is basically totally useless as fission reactors stopped needing uranium as fuel years ago leaving it as just a legacy feature, it can be safely disabled or ignored without issue.
I once said this about MineChem, and it still is relevant: Melons into diamonds.
Yeah, diamonds are made of carbon and thus diamonds are actually one of the easiest limited resources to obtain in the mod, as it's much harder to obtain gold or iron elements or whatever than it is to find things containing carbon. One of the issues with them, however diamonds are blacklisted from synthesis by default so that shouldn't really be a concern, along with any ore and dragon eggs. Can still happen with things like diamond dust though.
EDIT:
I am wondering about the throughput of this system- will it keep up with the gas turbine?
It'd depend greatly on how well you designed your system, and if you've altered the power configs. By default Minechem machines are capped at 100RF/t, so something like fusing plutonium atoms has a minimum of 94 ticks just to get the RF in needed to create it, all the rf costs, storages, and transfer speeds are configurable though. I've entertained using it with multipliers in the millions for fusion before, although that was intent to be balanced compared to the GT fusion reactor by cost.
EDIT 2:
Added another option to let you use water buckets instead of fluid water, makes it consume about 5% more RF at the saving of about 95% of the water.