# Operational Run

It is often not possible to run Balmorel optimisations for all hours in a year. You might also want to check the adequacy of capacities invested through other weather years. This guide illustrates the built-in capability of Balmorel to soft-link an investment optimisation with a operational run using rolling seasons. 

## Rolling Seasons
This section assumes that you have already run an investment optimisation with Balmorel, which by default outputs a lot of .gdx files to the simex folder. These files include `simex/GKACCUMNET.gdx`, which contain the capacities of the investment optimisation and is required for an operational run.

:::{warning}
- **Simex output gets overwritten for each scenario!** 
  
    If you are running several investment optimisation scenarios, the `simex/*.gdx` files will be replaced for each finished optimisation. Thus, include a copy command (Windows: `copy`, Linux: `cp`) in your batch script to save simex outputs for each scenario.


- **No simex output?** 

    You might have turned off the `export_results` global variable in `balopt.opt`. Make sure that it is turned on: `$Setglobal export_results yes`
:::

We will need to make adjustments to `balopt.opt` in order to perform an operational run. Follow the steps below below.

Turn on rolling seasons, import of simex-files and extra backup generation by turning on the following global variables in `balopt.opt`, i.e. append a 'yes' to them:
```
$setglobal RollingSeasons yes
$Setglobal import_results yes
$setglobal ADDTECHDEV yes
$setglobal ADDBACKUPGEN yes
$setglobal ADDTRANSDEV yes
$setglobal ADDHEATTRANSDEV yes
$setglobal ADDH2TRANSDEV yes
```

Turn off investment optimisation, decommissioning and export of simex outputs by removing the appended 'yes' in front of the following global variables in `balopt.opt`:
```
$setglobal TechInvest   
$setglobal TransInvest 
$Setglobal H2TransInvest 
$setglobal DECOM 
$Setglobal export_results
```

Notice that there are a lot of other options in `balopt.opt`, e.g. on how to manage interseasonal storages. This simple approach, therefore, lets Balmorel optimise the storage level of interseasonal storages freely for each week, which is more shortsighted than reality.