You can edit the Energy Usage Multiplier from your Mecha Icarus.
After first start with the mod, the config file get's generated, so you can edit the value.
Default Value: 0.5 which is 50% of the original usage. Negative values let you gain Energy instead of using it :) Or 0.0 for not using any energy at all.
Simply open the mod manager (if you don't have it install it here), select Mecha_Energy_Usage_Multiplier by Taki7o7, then Download.
If prompted to download with dependencies, select Yes.
Then just click Start modded, and the game will run with the mod installed.
Install BepInEx here
Then drag MechaEnergyUseMultiplier.dll into steamapps/common/Dyson Sphere Program/BepInEx/plugins
Feel free to contact me via Discord (Taki7o7#1753) for any feedback, bug-reports or suggestions