

Well, in pure energy usage, no; however if you take into account the energy usage of the whole chain, they’re orders of magnitude better.
After all, they can even be hooked up to a solar panel directly. For us to get 2000 kJ of energy, we need to water plants for a year, transport them, spend more than 2000 kJ of electricity cooking, and that’s not even considering raising an animal for x months or years which needs >5000 kJ a day to just exist. Our sun->movement energy efficiency rate is pretty appalling and orders of magnitude worse than a robot’s - even if the robot is just hooked onto the regular grid.



First of all, I’m going to say that I don’t think this comparison actually makes sense and I was just entertaining the question of the message I was replying to - humans are machines are way too different to reduce the comparison to merely “which is more energy efficient”.
But second, I compared to the same level - I stopped at infrastructure. I didn’t consider the costs (energy or otherwise) of building a solar panel or power plants in the same way I didn’t consider the costs of a frying pan, a hob, or farms. Because if we do that, then any point we make about this needs to be a 500 page dissertation, not a Lemmy message.
The good news is that data for how much material/energy is required for a solar panel is freely available, and also that a solar panel can be used for energy generation many more times than a cow.