Oh look, someone invented Cold Fusion (again)

Let us look at this from a logical perspective - If you have a monopoly on one of the only effective power sources in the known world but you know it's finite and will run out, do you

A) Spend your time and resources trying to eke every last drop out of it knowing full well it's still going to run out.
or
B) Eke every last drop out of it while also trying to be the forerunner of new energy sources so you can maintain your energy monopoly when your first one exhausts itself and don't become replaced by the next upstart company that thinks ahead

Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm. Tough choice

I'd say they already have and are just waiting to release the technology when they've milked our current resources for all they are worth. Announcing a new energy source prematurely could only hurt sales on their older stuff. Of course, they would have to balance that with the risk of someone else discovering what they are currently delaying on releasing, but when you get that rich you can easily just make someone disappear if something like that were to happen, I suppose.