Issue 58

Existing obligations for data provided from Central Volume Allocation (CVA) metering systems require only the estimation of missing or substitution of defective Active Energy measurements. The estimation of Reactive Energy measurements is excluded from the scope of Data Estimation and Substitution for CVA under BSCP03.

To enable Distributors to fully comply with their approved charging methodology obligations, it is proposed that Data Collectors should estimate Reactive Energy on a half hourly basis where no actual readings are available and should estimate accurate values of Reactive Energy on a half hourly basis where the actual readings are proven or strongly suspected to be in error.

A similar change was made in 2010 for Supplier Volume Allocation (SVA) metering systems under CP1303 ‘Requirement on Half Hourly Data Collectors to Estimate Missing Reactive Power Demand Values’. This Issue will look at extending this solution to CVA metering systems.

As well as CVA metering systems embedded within Distribution Systems which are subject to Distribution Use of System (DUoS) charges, this Issue will also look at enhancing the accuracy of data available to National Grid as the Total System becomes more actively managed at all levels. It will also consider the estimation and correction of Reactive Energy measurements at other CVA metering systems between, into and out of Transmission and Distribution Systems more generally.