How do Christians understand the existence of God in relation to the scientific concept of energy? In physics, the quantity of energy is the most fundamental aspect of existence.  All "entities" have a some sort of energy (either kinetic or potential) as an intrinsic aspect of their being.  Though people often use language that suggests that concepts or phenomena exist (e.g. "a signal propagates..."), such language is actually just short-hand for descriptions of a collection of entities.

The quantity, energy, is a measure of the ability of an entity to perform work on (i.e. to cause something to happen to) another entity.  Christians clearly believe that God causes things to happen.  Do Christians believe that the concept of energy (as understood by physics) can be applied to God?
Energy is merely matter in another form (see Wikipedia). Matter and energy are both part of the created universe, made by God (see Book of Genesis). Energy, like matter, was created by God. It is not an attribute of God, any more than height, weight or hair colour.

Obvious exception for the incarnated Jesus, who would have had energy, height and hair colour.