The table below shows the different measured properties provided by Elia.
| Measured Property | Power Type | Computation Method | Direction |
| AO | Active | Non Compensated | Outgoing |
| AO | Active | Non Compensated | Incoming |
| IO | Inductive | Non Compensated | Outgoing |
| CO | Capacitive | Non Compensated | Outgoing |
| CI | Capacitive | Non Compensated | Incoming |
| II | Inductive | Non Compensated | Incoming |
| ACO | Active | Compensated | Outgoing |
| ACI | Active | Compensated | Incoming |
| CCO | Capacitive | Compensated | Outgoing |
| ICO | Inductive | Compensated | Outgoing |
| CCI | Capacitive | Compensated | Incoming |
| ICI | Inductive | Compensated | Incoming |
| SCO | Apparent | Compensated | Outgoing |
| SCI | Apparent | Compensated | Incoming |
The measured values are determined by:
- Type of power
- Computation method
- Direction of the electricity flow
Types of power
We distinguish three types of power:
- Active power
- Reactive (Capacitive or Inductive) power
- Apparent power
The unit in which power values are presented depends on the type of power:
- Active power is expressed in Watts (W), Kilowatts (KW), and Megawatts (MW).
- Inductive and capacitive reactive power is expressed in Volt-Amperes-Reactive (VAR), Kilo Volt-Amperes-Reactive (KVAR), and Mega Volt-Amperes-Reactive (MVAR).
- Apparent power is expressed in Volt-Amperes (VA), Kilo Volt-Amperes (KVA), and Mega Volt-Amperes (MVA).
- Non-regulated measurement data may contain quantities other than power and are denoted with the corresponding unit.
The published data does include energy consumption in KWh for the selected time range.
Computation method
If power is consumed and produced within the same 15-minute interval, the non-compensated values show the measured values in both directions, while the compensated value is a calculated difference between the produced and consumed power during the 15-minute period.
Flow direction
The electricity flow can move in and out of the Elia grid. The flow from Elia to the customer is called "outgoing" or "offtake," and the flow from the customer to the Elia grid is called "incoming" or "injection."
The various measured properties can be represented in the four-quadrant diagram.
Difference between Gross and Net Values
Gross values are determined on the customer side, where it is important to precisely ascertain how much power is produced and consumed within a certain period. The concept of "gross" measurement is only relevant for access points with local production. Elia is only concerned with net values. The gross consumption in Elia tools is calculated based on compensated injection and offtake, but the result would be identical if using non-compensated injection/offtake.
Gross power is denoted with "G" and Net power is denoted with "N".
Calculation of Gross and Net Values
Gross Consumption = Net Offtake – Net Injection + Gross Production
Gross Consumption is the total energy used by a grid user, including energy that has been used but not drawn from the Elia grid (local production).
Net Offtake is the energy consumed by the grid user, usually measured at the connection point.
Net Injection is the part of the energy production of the grid user that is not used locally, usually measured at the connection point.
Gross Production is the sum of the production units of the grid user.