MP165 'ESME Voltage Accuracy'

Electricity Network Parties have a statutory obligation to ensure that the voltage supplied to consumers premises supplied from low voltage electricity networks is between defined limits at all times. They currently do this by making planning assumptions when low voltage networks are designed.
During the development of the smart meter technical specification, Electricity Network Parties requested that the average Root Mean Square (RMS) voltage readings from ESMEs would be recorded with a mandated level of accuracy. Such a requirement is not currently codified in the Smart Metering Equipment Technical Specifications (SMETS) or the Great Britain Companion Specification (GBCS).
The uncertainty associated with the lack of a mandated level of accuracy means that Electricity Network Parties must take conservative planning assumptions when designing and analysing performance of low voltage networks of, thereby preventing them from realising the full benefits from the smart meter rollout.

Codifying an agreed level of ESME voltage accuracy.