I'm not aware of a national database, so I did a couple of web-searches. There are at least some states that have electric utility service area maps.
For instance, California (my home state) has one. Start at this site:
The above linked site dives you a choice of Arc GIS, PDF Maps or interactive Web maps. It started with the Web Maps but couldn't make it work properly. Thus, I went to the PDF Maps, and it popped up a page of choices, and one of the first ones was Electric Utility Service Areas, which I clicked on, and it brought up a large map. The largest utilities (by area) were color coded. Smaller utilities showed the outline of the utility, filled in with a contrasting color, and either a name in the service area or nearby. The smallest utilities were grouped, but had the names of utilities for each group. I zoomed in, but even the highest zoom didn't provide any additional details.
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