Omnipotence means unlimited power or authority.
Covenant means a binding oath made between parties.
Elohim, the God of Israel, because of His power, has the ability to keep His covenant forever with Israel and all who believe. Certainly it does. The idea of a plurality in the Godhead is unexplainable by human analogy. He is three Persons, yet one Almighty God. This incomprehensible truth is revealed in many additional portions of the Old Testament as well as in the New.