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Solution for me was that the OS:Sizing:Plant, Loop Type was set for "heating," perhaps by default, and I hadn't found this and changed it "cooling." After changing to cooling, chillers started reporting electricity in the Cooling:Electricity meter.

Finding OS:Sizing:Plant in the OS interface was hard too, you need to click on the dotted line that graphically separates the Supply Equipment from Demand Equipment, to make the dotted line (?) active, which reveals all the hidden settings for the HVAC system in question. Then, scroll down the right sidebar to find OS:Sizing:Plant.

I have not been able to get the Heat Rejection:Electricity to report on the meter, using similar troubleshooting. Still zeros on the meter.