Toraxxis mega-refinery

Located in the remote Toraxxis Plains of Cybertron, the Toraxxis mega-refinery is one of the planet's largest sources of energon, having an output of 8 billion megaliters of energy per production cycle. Bafflingly, it's got very poor security for such an important location: at night, the entire refinery is protected only by its permacrete walls and a single guard in control of a group of sentry drones.

Fiction

2005 IDW continuity

With Cybertron suffering from a massive energon shortage early in the war, the Toraxxis mega-refinery was the last major energy source remaining on the planet. Hired by an unnamed client, the Dynobots broke into the refinery to rob it of energon, killing the overconfident guard in the process. Wreckage Just as they were finishing up, however, Scorponok arrived with his Decepticons, having planned to capture the Toraxxis mega-refinery to power the Decepticon army and force their enemies to fight over the few scraps of energon they could find. In response, Grimlock triggered the refinery's alarms, alerting the Autobots to the attack. Faces of Darkness Grimlock defeated Scorponok within the facility's interiors only to be threatened with arrest by Optimus Prime, who saw his Dynobots as a threat. Desperate, the Dynobot leader threatened to deactivate the refinery's fusion-regulator, which would overload the fusion-core and destroy Toraxxis and everything around it. He was talked out of it by Prime, only for Scorponok to mock his compassion and leap upon the regulator, deactivating it in his stead. Rage The resulting explosion could be seen from space and not only killed thousands of Cybertronians, but also robbed Cybertron of a vital source of energon, forcing many more to abandon their planet. A team of scientists were sent to the irradiated Toraxxis crater by Optimus Prime to search for any traces of fuel, and found that the explosion had opened up long forgotten caverns. Fallout

The Toraxxis mega-refinery was later rebuilt for the purpose of extracting and purifying the reservoirs of corrupted energon discovered in the caves. Thanks to this new resource the refinery could provide enough energon for all of Cybertron's population... or what remained of it after the exodus, anyway. Primacy #1

A popular conspiracy theory would later claim that Optimus Prime, not Scorponok, was responsible for the destruction of the original Toraxxis. Winners & Losers