Is this a modpack or mod issue?
I guess this is a configuration setting, so it is a modpack problem.

Added Xaeros_Minimap_21.8.1_Fabric_1.16.5 and XaerosWorldMap_1.13.5_Fabric_1.16.5
Disabled chillager_mod-1.1.jar jumploader-2.1.3.jar ratsmischief-1.1.1.jar and terrarian-slimes-1.16.5-1.0.3-BETA.jar

Modpack Version
2.8.3

Describe the bug
To make a bucket/cell of helium plasma, we need a fusion control computer, 16 coils and the ingredients.

Using a plasma generator with a bucket of helium plasma does not produce energy to power the fusion control computer to make a bucket of helium plasma, provides about 25% of the power required.

Expected behavior
I would expect that the energy produces would give a net gain of energy required and possible a lot more as making the fusion control computer and the coils requires a considerable amount of time and resources.

Screenshots
This was after a week of using the diesel generator and one bucket of helium plasma

Additional context
The diesel generator is pretty useless as it is a low tier machine that need high tier machines to make its fuel. This means that the output rate is horribly low. I should raise an issue on the Tech Reborn tracker unless this can be configured in the pack.

Now I get it, the fusion control computer needs 40M E before it starts working, and then it produces power by itself. The Tech Reborn wiki does really mention this. Funny that it can store more power than 100ME

There is another possibility that the recipe does not work. I am not sure how much power it takes to produce a helium plasma cell. If it is 16k as the tooltip indicates, then the recipe does not work.