Alien Thermal Plant

This system is directly converting local thermal energy into electric current at 90% efficiency. Most of this energy is being stored in the battery-like devices within the plant itself, each of which holds enough to power a small city for a year. Some of it, however, is being drained off, presumably as it is distributed to other facilities on the planet.

The power plant appears to be fully automated and - given current understanding of the mechanisms involved - uninterruptible.