Adding a section in each bots profile that displays total energy gained.
I'd say minus resets (so only the active current tally from the most recent reset assuming you have one, otherwise doesn't apply). I'm sure an addition of "Total lifetime gained" could also be discussed.
The HoF for this could be located at the bottom of HoF under the historical data section.
And when Ender does get around to account linking, could even have a section on the main bots profile that displays "Total Aggregate Energy" or something similar.