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BGE in front...next pole you see PEPCO OV-15!
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Look carefully...you'll see how the very top wires separates...and two different streetlight arms....both streetlights shown here on wooden poles are powered by different electrical companies...you can see the others in
Streetlight Battles Album
Also Dave has a pic, hopefully he will have more...see his one pic here
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Denver, is Xcel energy, they have HPS cobraheads and Tapered E arms, sometimes truss or Guy Wire. MVs are rare in Xcel energy. And their Electrical pole's have scattered designs. More standardized up in the mountains.
Colorado Springs has their own utility, lots of M-250 A's, some M-400 A's, M-400 r2 FCOs... And more. Most HPS, some scattered Mercs still laying around there. Their electrical lines are standardized, and way different than IREA and Xcel.
Duquesne Light also has many OV-15's, OV-25's and M-250R1 and Unistyle 175's in mercury vapor but the majority of the streetlights are high pressure sodium such as the L-150's, L-250's, M-250R1's, M-250A's, OVS's and 113 Series.
Tarentum electric has many mercury vapor and high pressure sodium lights mixed together and the borough also is it's own utility provider Redcat Power.