A new switch on the generators/power plants should be implemented to control base power management correctly:
Balance. The base should balance power consumption and required production considering lower fuel consumption (turn bigger power plant if it makes sense, rather than several smaller to exactly match power consumption with required production). It should work in this mode by default.
Economy. The base should maximize battery usage and minimize fuel consumption. Should be possible to enable only when battery sites are available and have power.
Max. The base should produce maximum electricity, considering available fuel and available space in the batteries (no sense to produce more than can be saved to batteries). Should be possible to enable only when battery sites are available and can be charged.
Manual. Manual power management control. The base should not automatically enable/disable generators/power plants. If not enough power - a relevant message should appear. With an additional message that the base is in manual power management control.
A new switch on the generators/power plants should be implemented to control base power management correctly: