The utility that served this city was the Edison Electric Illuminating Company of Brockton. They also provided electricity to numerous neighboring south-of-Boston communities. The company became the Brockton Edison Company in 1938.

Like most other electric companies, glass insulators were employed until the teens when porcelain pintypes for lower voltages were becoming nearly universal in the industry. It appears from the photo that CD 134 and 162 insulators were present. These likely were of Brookfield or New England glass manufacturers. Several CD 134 Diamond-P insulators have been found in Brockton that were used on the city's fire alarm system. These insulators were aqua, greenish and sapphire blue. It is possibly the electric company originally used these and sold them to other users when porcelain pintypes became standardized for primary and secondary line distribution applications.

The next image shows a closeup of the top of the pole on the far right and the following one is a close look at the top of the pole in the foreground.