Machine Upgrades
Every machine/generator can receive a Machine Upgrade, and your choice of either an Ender or Nether Upgrade. Shift+Right click the upgrade on a machine to install. Ender/Nether upgrades require a Machine Upgrade to have been installed in the machine.
Machine Upgrades generally improve power an efficiency by a bit. Ender Upgrades generally greatly improve efficieny, which Nether Upgrades generally improve power but at a cost. However, the upgrades sometimes unlock entire new abilities.
Some machines are not affected by upgrades.
Recipes:
Machine Upgrade: 
Nether Upgrade:
