A Lightning Generator can transform atmospheric electricity to serve a variety of useful functions.
Charm of Electromancy
After spending a Long Rest in your Lightning Generator, you take 8d6 Lightning damage and you gain a magical Charm that lasts for 7 days (see the Dungeon Master's Guide for rules on Charms). The Charm has 3 charges. You can expend 1 charge from the Charm to cast the Telekinesis spell. Once all its charges are expended, the Charm vanishes from you.
Revivification
When you cast the spell Raise Dead and Resurrection while in this facility, the cost of that spell's Material components are reduced by 1,000 GP (minimum of 0).
Empower: Lightning Life
The facility's hireling channels the Generator's energy to cast Animate Objects, targeting one Large or Huge object of your choice in the Bastion. The spell's duration is 7 days and doesn't require Concentration.