Is it true that there are meters that continue to run during a power outage?

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An outage means absence of power. Since a meter needs energy both from the grid and the subscriber's internal load to operate, it is therefore impossible for an electricity meter to continue operating when there is a power outage. 

However, we have realized that some customers have generator sets are improperly connected. Since they install their genset upstream the Eneo electronic meter, it supplies power to the meter causing it to run as soon as it takes over following a power outage.