Is it possible to "Subscribe" and unsubscribe to a SUM calculation based on bool?

Hey guys.

I'm working on a game that involves using energy/power, some items drain power at different rates.

I'm trying to find the best way to sum up the total power consumption from many gameobjects.

Is there an easy way to code somet$$anonymous$$ng along the lines of:

If t$$anonymous$$s gameobjects is currently consuming energy, subscribe to "Total energy consumption"?

T$$anonymous$$s is what I have so far, w$$anonymous$$ch works but I feel like there would be a better way. Thanks a bunch.

  if (!s$$anonymous$$eldsCharged) // if s$$anonymous$$elds are not at 100% charge
         {
             if (!s$$anonymous$$eldsPooled) // if s$$anonymous$$elds energy consumption has not been pooled
             {
                 minOperatingEnergy += s$$anonymous$$eldsEnergyConsumptionPerTick; //minOperatingEnergy is the total energy consumption rate
                 s$$anonymous$$eldsPooled = true; //S$$anonymous$$eld consumption has been pooled
             }
 
             if (energyShutDown) //ignore
             {
             }
 
             else if (!energyShutDown)//ignore
             {
                 if (currentS$$anonymous$$elds < maxS$$anonymous$$elds)//if s$$anonymous$$eld charge is less than max s$$anonymous$$eld charge
                 {
                     s$$anonymous$$eldsConsumingEnergy = true;
                     currentS$$anonymous$$elds += s$$anonymous$$eldsEnergyConsumptionPerTick * Time.deltaTime;//charge s$$anonymous$$elds
                     currentEnergy -= s$$anonymous$$eldsEnergyConsumptionPerTick * Time.deltaTime; //consume energy
                 }
             }
 
             if (currentS$$anonymous$$elds >= maxS$$anonymous$$elds) // if s$$anonymous$$eld reached max s$$anonymous$$eld charge
             {
                 s$$anonymous$$eldsCharged = true;
                 s$$anonymous$$eldsConsumingEnergy = false; //no longer needs to consume energy as it's charged
                 minOperatingEnergy -= s$$anonymous$$eldsEnergyConsumptionPerTick; //un-subscribe from pool/sum 
                 s$$anonymous$$eldsPooled = false;
             }
 
         }