Gordon Freeman must fight his way into the remote arctic prison, Angel Mogila. The level is a small area of roughly the same scope as a single area in a larger Half-Life 2 level. Consequently the module is a slice of what would be a larger level. This level features stealth gameplay using a custom designed night vision effect and custom AI controllers to enable stealth gameplay. The player can elect to rush the level at a higher margin of difficulty. Power Outage also features destroyable power transformers that knock out the lights in each section of the level.