Site
MeteringA single physical location, such as a factory, office, or substation, that can hold one or more MPANs: an import MPAN, an export MPAN, or both.
A site is the physical place where power is taken from, or fed back into, the network. It is not the same thing as an MPAN: the MPAN identifies a specific supply point, and one site can hold several MPANs.
Most sites have a single import MPAN, covering the power they draw from the grid. A site with its own generation, such as solar panels or a battery, can also hold an export MPAN for the power it feeds back. Larger EHV (Extra High Voltage) sites often have both, and each is charged on its own terms: import charges on the import MPAN, and a mix of charges and credits on the export MPAN.
This is why the EHV Site Tariffs tool is organised by site rather than by MPAN. A single EHV connection can carry both an import and an export leg, so we surface the rates for each.
Example
An EHV factory with rooftop solar holds an import MPAN for what it consumes and an export MPAN for what it generates, both at the one site.Related terms
Put this into practice
Explore EnergyCode's charge tools to model DUoS, TNUoS, gas transportation and policy costs against your own sites.
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