Well years ago Alabama Power used some frequencies in the 450-454MHz range, don’t remember the exact ones but I do know they were somewhere in between. I haven’t monitored AP there in a long time too as it has been stated that they use Southeren Linc but there could be the possibility of them using those old ones as back-up I guess.
Checked the FCC's database ( not the one provided here in the forum.) NO licensing exists under Alabama Power, but the parent company is "Southern Company" and doing a 'Licensee / State' search netted three pages of license data. Try the search yourself and try to determine which are Southern Company and which are Alabama Power.
What TYPE of antennas are on their trucks in your neck of the weeds? That may help to narrow the frequency possibilities if in fact they are using some non Southern Link equipment. Good luck...
This may not be the area you are interested in but Birmingham "Operations" was on
451.1250 and the Huffman/Leeds district on 451.0750. There were lots of others,
just can't remember that far back!
Hope this helps.