4.4: utility meters are preferred and need no validation. Non-utility meters are used where utility data is incomplete, less reliable (infrequent reads, high-voltage side metering) or less direct, and are documented with reports and diagrams. Cumulative meters (a permanent on-board register, including pulse meters with an absolute count) can serve inclusions or exclusions; non-cumulative meters (interval, cloud) cannot be gap-filled and serve inclusions only when reconciled against a parent utility meter (not a virtual meter), otherwise exclusions only; soft meters and equipment sensors serve exclusions only (inverters excepted) and must integrate true energy; virtual meters (subtraction or summation) cannot be used where a balance to a utility meter is needed, must rest on validated meters and are calculated by the input form from raw data. Where the utility meter is on the high-voltage side, low-voltage non-utility meters covering 100 % of electricity may be used after reconciliation; transformer losses above 10 % must be investigated, and without compliant LV meters the HV meter is used with no loss allowance.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.