Yes, we can reduce energy needs to human labor; we can also reduce human labor to energy needs. I invite you to try out the exercise. Since both are substitutes

Yes, we can reduce energy needs to human labor; we can also reduce human labor to energy needs. I invite you to try out the exercise. Since both are substitutes for one another to a significant degree much of the time, it's easy to get trapped into the thinking that they're always substitutes. The reality is that despite their fungibility, you tend to reach the limits at an extreme (think like a Cobb-Douglas function). And yes, the disjunction between market value and cost is well-known. They only converge under certain market assumptions, an interesting subject of study in itself.