Convention 1.01 - Apportionment of On-Site Renewable (OSR) Electricity Generation

To be included in any EPC calculation the on-site renewable (OSR) electricity generation must be connectedto the electrical installation on the consumer side of the primary supply meter serving the building (or buildingpart) being assessed. Provided this condition is met:

1. OSR electricity generation is allocated to the primary supply meter the OSR is attached to.

2. If it is clear that the meter serves more than one building (or building part) then the OSR should beapportioned to all of the buildings (or building parts) to which the meter is attached on an areaweighted basis.

3. Where it cannot be determined that the OSR supply is attached to a meter serving the building (orbuilding part) being assessed then no OSR electricity generation should be allocated to that building(or the building part).