Add it to your server
In your server's .ini file (servertest.ini by default), add these to the existing WorkshopItems= and Mods= lines, separated by a semicolon (;).
WorkshopItems=3829037209;3831977312
Mods=KSS;KSS_SmartGrid
These lines include the mod it requires, as its Steam page declares it:
| Workshop item | Subscribers | Declared in |
|---|---|---|
| Kader Solar Station (KSS): Smart Grid [42.20+]3831977312 | 1 | description footer |