Analogous to this is the explanation for how lightning is formed. It explains the mechanism for the bolts in the sky. But even this doesn’t tell us anything about the ultimate mechanism.
And most of all, we still don’t know what energy is.
e=mc^2
Hope this helps.
Seriously, we do know that its carrier 'particle' is the photon, one of the many bizarre entities of the quantum realm which can behave as both a particle and wave phenomenon at the same time. That is, until someone or thing? 'looks' at it. Then it becomes 'real', whatever that means.