In “Topics of Natural and Theological Science”, Gregory Palamas reconciles the issue I had concerning one vs multiple energies as follows:
"68. The divine supraessentiality is never named in the plural. But the divine and uncreated grace and energy of God is indivisibly divided, like the sun’s rays that warm, illumine, quicken and bring increase as they cast their radiance upon what they enlighten, and shine on the eyes of whoever beholds them.
In the manner, then, of this faint likeness, the divine energy of God is called not only one but also multiple by the theologians. Thus St. Basil the Great declares: ‘What are the energies of the Spirit? Their greatness cannot be told and they are numberless. How can we comprehend what precedes the ages? What were God’s energies before the creation of noetic reality?’ For prior to the creation of noetic reality and beyond the ages - for the ages are also noetic creations - no one has ever spoken or conceived of anything created. Therefore the powers and energies of the divine Spirit - even though they are said in theology to be multiple- are uncreated and are to be indivisibly distinguished from the single and wholly undivided essence of the Spirit.
- The theologians affirm that the uncreated energy of God is indivisibly divided and multiple, as St. Basil the Great has explained above. And since the divine and deifying illumination and grace is not the essence but the energy of God, for this reason it comes forth from God not only in the singular but in multiplicity as well. It is bestowed proportionately on those who participate in it, and corresponding to the capacity of those who receive it the deifying resplendence enters them to a greater or lesser degree."
*Nikodimos, Saint. The Philokalia: The Complete Text (Kindle Locations 23386-23389).
Lulu.com. Kindle Edition. *
His first analogy, to the effects of the suns rays, suggests that there is one energy but multiple effects of that energy, which is consistent with the Fifth Council of Constantinople and the teaching of Saint John of Damascus, who identifies four different meanings of “energy”:
“But observe that energy and capacity for energy, and the product of energy, and the agent of energy, are all different. Energy is the efficient (δραστική) and essential activity of nature: the capacity for energy is the nature from which proceeds energy: the product of energy is that which is effected by energy: and the agent of energy is the person or subsistence which uses the energy. Further, sometimes energy is used in the sense of the product of energy, and the product of energy in that of energy, just as the terms creation and creature are sometimes transposed.”
newadvent.org/fathers/33043.htm
Palamas and the Fifth Council of Constantinople seem to be saying that there is one energy in the first sense that Damascene gives (essential activity) but multiple energies in the third sense that Damascene gives (the products or effects of essential activity).
Based on this, it seems that the one simple energy of Damascene/Palamas/Constantinople is the same as the essence of the Fourth Lateran Council. The key, and perhaps only, difference is that Constantinople added a cause to the energy, and this cause they called “essence”, whereas the Fourth Lateran Council affirmed that the energy has no cause - it simply Is - the energy is the essence.