Power Module

Lore
It's a small glass tube encased in elaborate metal framework. The tube is very warm to touch and contains what appears to be constantly shifting liquid fire.

Source
Source of power modules in game:


 * Mining Outpost - x1
 * Maadoran
 * The Slums Well strongbox - x2
 * Merchants Plaza Curio Trader - x1
 * Caius Amerius During the quest The Rightful Owner - x1
 * Harran's Pass from Ramirus - x2
 * Old Facility - x1 (Valve near hangar door, Perception required to spot it + Crafting 5 to open it)
 * Hellgate Underground - Chest room - x2 (Traps 7 required for the second one)
 * Dead river Group of 3 scorpions at the center-left of the map guards a skeleton - x1
 * Ganezzar Commercium building - You need to pass following checks: Sneak 5, Lockpick 8, Traps 8

Usage
Power Modules are usable in:
 * Power Armor - x3
 * The Ghost Hand - x3
 * Respirator/Prospector's Amulet - x1 (dialog when you're inside The Abyss or Dead River)
 * Bolter crossbow - x1
 * Old Facility Hangar control panel - x1
 * Mining Outpost's smelter - x2 (First one turns it on, second one makes it pumps out Blue Steel