In the current version of the mod, there are some alternate unlocks (energy for the various shield upgrades, for example) that are not correctly shown in their descriptions. You only notice that they have a secondary unlock method once you're capable of researching the tech node in question.

I think I've fixed all of them, and I've definitely made it a lot easier to add the appropriate disclaimers into their descriptions.

BUT.

There is a possibility that I overlooked something. If you stumble upon a tech node with a secondary unlock method, and the node doesn't explicitly say "Alternate Unlock: Spend (SOMETHING)", please post here with the name of the node in question so I know there's a problem.