energy is lost each time it is used,
no.
disperesed is a better term.
At least a term that is not totally false. According to the 2nd law of thermodynamics, no system can be 100% efficient since some energy becomes too disordered to use (still there though and some of it could be used with more advanced technology). This happens regardless of what is used to run a society, and its effects are small so it doesn't affect us at the moment (time has to pass for its effects to be seen).
As for your biological example, most of the energy is used to maintain the animal and is mostly converted to heat, which is not lost, it's just not eaten.
But looking at this, it doesn't really factor into scarcity conditions since all you need is to provide more energy than can be consumed. That is why Technocracy is a technology. Like any technology it needs more energy put into it than it outputs or else it doesn't work. So if you can get your car to run by providing it with an abundance of fuel then why can't a Technocracy run with an abundance of production and resources that North America can easily provide?
Regarding the machines, Technocracy advocates the control of technology, not people. Therefore, people would not be subservient to machines. The machines would be used by the people to fulfill all their needs (not unlike now). Technology is a tool, high automation won't change that, since people are needed to maintain and control the technology. There’s AI but that’s another topic.
i think it is necessary to take a few steps back, while still using many industrail methods of production, and probably some ideas from technocracy to create a a society with a slower more sustainable growth.
I'll agree there. Although the whole of Technocracy's plan is just as good as it's parts.