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You need to launch your core (usually an option every 5-10 waves).

Generators act as a storage for surplus energy that:

A) Sustains machinery and energy-weapons when cut from your power grid.

B) You consume more energy than your power grid has, like if you build too much machinery and need to resolve a power crisis, or you have a ton of energy-weapons.

Really, its just finding the highest efficiency method to drilling resources. Waiting to launch till you're core is full on resources or you can't go further w/o risking losing your core is helpful, too.

You can't get allied units (drones) to go around a specific point. As some advice, I would avoid using drones for anything outside of core vs. core.

While you can only have 1 core, where resources can be used for building, you can build upgraded mech pads and spawn there. Additionally, launch pads let you launch resources before you launch the core.

If you're playing on mobile, then just go to your app store and update it.

If you're playing on a computer, then export your data and reinstall mindustry, and import the data previously mentioned.