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First off, the ElectricLoadCenter:Distribution and ElectricLoadCenter:Generators are not measures, they are objects in energyplus. BCL measures typically add many objects to a model, like everything necessary to make a plant loop, which is quite a few energyplus objects. It is very unlikely someone made a measure to add those objects by themselves. They also need to be connected to relevant objects in the simulation.

That being said, I'm not sure how to add an ElectricLoadCenter:Distribution or ElectricLoadCenter:Generators object using Openstudio. In fact, Openstudio may be unable to handle those objects. Last I checked, Openstudio does not have all Energyplus objects implemented.

What I recommend is completing as much of your model in Openstudio, then File -> Export -> IDF your Openstudio model to a .idf file. You can double click the .idf file and use the IDF editor to add in the ElectricLoadCenter:Distribution, ElectricLoadCenter:Generators, and any other objects you need to complete the model.

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Then you can simulate, with whatever weather file you want, the idf file with the objects you've added.

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The simulation will probably fail the first time you try to run your idf file. Then you can take a look at the errors energyplus generated, which you can usually look up in the Input Output Reference, find the answer on unmet hours, or the error is self explanatory enough to find the problem.

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Then keep fixing the errors until your simulation actually runs, in which case you may still need to fix warnings, like water pipes freezing or hot water heaters overheating or hvac systems not cooling sufficiently or etc.