As stated in wikia...Energon is the preferred fuel/energy source of Transformers. It has also been shown as food, intoxicating drink, ammunition, even currency. More, it has been described as the basic building block of all Transformers' bodies and sparks.
Typically, energon is highly volatile. Even a small impact can cause energon to detonate explosively.
In most continuities, the safest way to transport Energon is when it is condensed into the form of an energon cube. In this form energon is more stable, but still quite dangerous.
