Antimatter

Antimatter is a powerful energy source though somewhat unstable.

Fiction

Generation 1 cartoon continuity

An antimatter formula was created by Dr. Alcazar which came to the attention of Megatron who wanted it as a source of energy. He deleted the formula but sent it to Chip Chase. Ultimately, it was learnt that antimatter was simply too unstable to use. Roll For It

From Teletraan I: The Transformers Wiki, a Wikia wiki.