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ETSNZ At what point do the PM power meters change from kWh to MWh?

Energy value units are automatically changed, based on the quantity of energy accumulated (e.g., from kWh to MWh, from MWh to GWh, then from GWh to TWh, from TWh to PWh). 
I.e it changes to MWh after 9999kWh 
 
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