I find quick rule of thumb, big corporations and major worlds such as Capitals and factory worlds would have two, one Zenith and one Nadir.
Obviously, protecting these are essential, any " common " breadbasket-like world would have one, to quick charge their potential cargo carriers on their way faster... Most worlds wouldn't have the capital to build one, let alone be able to run it.
There are exceptions...
Pirates tend to barely fix theirs, but they have them, most peripheral worlds tend to have at least one, ancient as hell, but serviceable from when the Star League was still around... Most of the other C class stations aka Comstar classification, tend to use natural lighting... If the HPG station is A, then assume 2 minimum of 1, B? then it'll have just 1...
Again exceptions to the rule of thumb... if you want one, you'll put one in...
TT