We are talking about the new electronic meters. What is the difference with the old ones?

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1- The electronic classic: High accuracy/reliability of counting; but basically no difference on the principle of measurement;
2- Prepaid: Payment of energy in advance and better management of consumption; but no fundamental difference on the principle of measurement;
3- Communicating or intelligent meters: High accuracy/reliability of metering, remote reading; but no fundamental difference on the principle of measurement.