Skill Explanation: Energy Systems (Patreon)

For the Energy Systems skill, here's a list of what levels are prerequisites for the blueprints Belessar can unlock. Numbers in brackets indicate storage capacity.

Level 1: Small Power Pack (1.5 MJ), Heavy Power Pack (1200 MJ). 

Level 2: Small Fusion Reactor - Type 1, Plasmium.

Level 3: Medium Power Pack (60 MJ)

Level 4: Advanced Power Conduits. 

Level 5: Power Pack Integrator

Level 6: Microfusion Reactor, Type 1.

Level 7: Small Fusion Reactor, Type 2.

Level 8: Mega Power Pack (18,000 MJ)

When the skill goes up a level, there is a 30% - 50% chance of unlocking a blueprint as well, and a 10% chance of unlocking a second blueprint. However, getting and unlocking blueprints is a completely separate activity, so he has to acquire them independently.

Belessar can gain an advanced blueprint without having the requisite skill - for example, he could theoretically unlock Mega Power Pack as a quest reward or from Reverse Engineering at Level 1 in Energy systems as well.

But unless Belessar has the minimum level of skill required as above, even if he has the blueprint unlocked, he cannot use it to create a working device.