You said yourself, beings of pure energy. Sure, that would be one option. Quoting: Anonymous Coward 23836182
Another would be beings that get their necessary energy from sunlight and water only. That would be a more loving arrangement.
Better to stick with just sunlight though, as water is a limited resource and will just lead to people fighting over it when it is scarce.
Better yet, how about sunlight and nitrogen, freely available in the air.
People who can only come to one conclusion, that we must have been created by an omnipotent, omniscient being have absolutely no imagination. Can only believe what others before them have believed.
Yes, but issues. Energy is boundless. It dissipates. How to propose to stop that from happening? I thought about it. I can't imagine a means of doing so. You could be like a capacitor, but how to create the differentiation of the parts? Those parts would need chemicals to form into structures and would have to be deposited by some form of absorbtion. It's just like eating, for all chemical processes result in waste products and so excretion.
Euglena use sunlight.
[link to en.wikipedia.org
They're autotrophs but also ingest, so fail. Their bodies are extemely limited, so unless you'd like being a unicellular organism, then nope.
All life uses water in some form. You need a process of creating and maintaining water. You need a process that removes any cellular wastes deposited by dying species. We have species that do that trick.
An energy being would die and release their energy. Usually a release of energy is difficult to control. It could cause the death of other energy creatures. It seems implausible based upon physics.
In order to use sunlight, requires structures like chloroplasts, and these require other organic compounds, so again you need metabolism and digestion.
To use nitrogen, for what purpose? Breathing? If so, you need respiration, and that always produces cellular wastes and by product gases, and therefore you need metabolism and digestion, as well as circulation, and specialization. Nope...fail.