During my time 'Peating' I have been in what I would call a "high energy state" many times but I'd say like 95% of these times pale in comparison to the 5% where I feel absolutely amazing and like a higher power has suddenly blessed me with immense health.
I recall someone saying that Ray once said having good thyroid function means you can "think the way you want to about different things" and so I'd categorize a healthy high energy state in this way; feeling great and being able to think in new ways you hadn't previously.
In work environments, you will see people who seem to have abundant energy and are able to carry out their work very quickly. But if you look a little closer, you might see that the majority of these people are running completely on stress and if there is any extended gaps in the flow of their busy-ness they become completely miserable.