Very interesting concept, but doesn't scratch that itch for incremental games. If the energy generation was increased by tick speed or a progress bar that slowly filled up with your energy the game would feel much faster. Additionally a little icon that told you how much energy you were generating so that every energy milestone that unlocked the next tier of energy collecting robots went online it would feel so much better.
The beginning of the game is fairly confusing, with no obvious goal until you start messing around. The slow generation feels intentional until you continue playing and you realize that the game itself is incredibly slow. This could definitely be helped by early unlocked buildings to speed things up, or even just a button which allowed you to manually generate power (which would obviously not work with the theme so I understand why stuff like that doesn't exist.)
Other than the previously mentioned bug by @ousire, I didn't encounter anything that broke my game, which is good within itself even if the game is simple.
Overall, well kept with the theme and optional theme but not very enjoyable to play overall. Definitely a very solid entry!