(efi_fast)=

# Coupling firm load (area load) to the grid

In the market model each area has a given firm, nearly inelastic load. This can, however, depend on temperature. This load represents most of the non-industrial load in the system and must be distributed to the busbars in the area. This is specified in the file `EFI-FAST.DAT`.

For each area, all productions weights are accumulated and relative shares for each busbar are computed. If the same busbar is listed several times, its weights are accumulated.

If a busbar is listed in ``EFI-FAST.dat`` but do not exist in the grid description, this is not reported to WLog. This choice was made to avoid overloading the WLog.

In this file the following is specified for **each area**:

- Header counter (Number of busbars in the area)
- Firm load parameters

## Header counter

The number of busbars in the area

Record format:

```text
<The number of busbars in the area>,
```

Example:

```text
8,
```

## Firm load parameters

Number of entries must match the header counter.

Record format:

```text
<Busbarnumber>, <P>, <Q>, <Load weight>, <COSFI>, <text>
```
Fields:
- 1: Busbar number
- 2: Unused
- 3: Unused
- 4: Load weight
- 5: Unused
- 6: text (optional)

Example:

```text
10001,    0.0,    0.0,    0.44444,    0.0,
```
## Example complete file

**Comments** start with ``CC``

```
CC,------------------------------------------------------------
CC,    Delomr�de   1                                        ---
CC,------------------------------------------------------------
   8,
10001,    0.000000,    0.000000,    0.444440,    0.000000,
10002,    0.000000,    0.000000,    0.000000,    0.000000,
10003,    0.000000,    0.000000,    0.000000,    0.000000,
10004,    0.000000,    0.000000,    0.000000,    0.000000,
10005,    0.000000,    0.000000,    0.000000,    0.000000,
10006,    0.000000,    0.000000,    0.555560,    0.000000,
10007,    0.000000,    0.000000,    0.000000,    0.000000,
10021,    0.000000,    0.000000,    0.000000,    0.000000,
CC,------------------------------------------------------------
CC,    Delomr�de   2                                        ---
CC,------------------------------------------------------------
   6,
20008,    0.000000,    0.000000,    0.000000,    0.000000,
20022,    0.000000,    0.000000,    0.000000,    0.000000,
20009,    0.000000,    0.000000,    0.277800,    0.000000,
20010,    0.000000,    0.000000,    0.000000,    0.000000,
20011,    0.000000,    0.000000,    0.000000,    0.000000,
20012,    0.000000,    0.000000,    0.722200,    0.000000,
CC,------------------------------------------------------------
CC,    Delomr�de   3                                        ---
CC,------------------------------------------------------------
  10,
30013,    0.000000,    0.000000,    0.000000,    0.000000,
30014,    0.000000,    0.000000,    0.000000,    0.000000,
30023,    0.000000,    0.000000,    0.000000,    0.000000,
30015,    0.000000,    0.000000,    0.000000,    0.000000,
30016,    0.000000,    0.000000,    0.000000,    0.000000,
30017,    0.000000,    0.000000,    0.000000,    0.000000,
30018,    0.000000,    0.000000,    0.530000,    0.000000,
30019,    0.000000,    0.000000,    0.000000,    0.000000,
30020,    0.000000,    0.000000,    0.470000,    0.000000,
30024,    0.000000,    0.000000,    0.000000,    0.000000,
CC
FILNAVN=
CC
```