What are the Electricity:Plant constituents?

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You can see what variables are included on which meter objects in the .mtd (Meter Dictionary) file located in the run directory of your energyplus model. Just search that file for For Meter=Electricity:Plant and you'll see what's included on that meter.

I have found this pdf document which gives example that might help you.

For Meter=Electricity:Plant [J], contents are: CENTRAL CHILLER:Chiller Electric Energy HW CIRC PUMP:Pump Electric Energy CW CIRC PUMP:Pump Electric Energy

I also found that pdf that reads:

CHILLER OPERATION In plant equipment, the simulation model contains two chillers, one large and one smaller. Generally, the larger chiller operates from morning to noon and the smaller chiller operates from afternoon to night. When calculating the energy consumption to the chiller electricity, should I sum those two values? Answer Each chiller will have an output report variable for its "Chiller Electric Power [W]" and its "Chiller Electric Consumption [J]" (see Input/Output Reference, section "Generic Chiller Outputs" and section "Report Variable"). Yes, you should sum the values for each chiller if you want to know the total electric power or electric consumption for the two chillers. As an alternative, the "Chiller Electric Consumption [J]" is metered (i.e., summed for all electric chillers) on Electricity:Plant. However, this meter will also contain the pump energy and cooling tower fan energy if a tower is being simulated. Look in the Input/Output Reference at the section entitled "Report Meter, Report MeterFile Only" for more information regarding report meters.