Just what every self-sufficient off world colony needs, their own power source.
Of course having such power could well mean having people trying to steal it from you, so best get some OKI walls around the perimeter to help keep the bad guys (and bugs) at bay!
Don’t delay, use OKI power today!
Here is a ropey quality image that shows them with a 15mm from GZG.
Sorry for the quality, but it gets the size across I hope.