The people who write DC’s emergency alerts need to learn to consider their audience. Yesterday, they sent an email alert that said:
PEPCO reports a 5% Voltage Reduction has been implemented across the PJM area. In addition customers are requested to curtail consumption. 5% voltage reduction will not result in interruption of power supply but rather a reduction in the supply voltage to customers.
PJM area? Zuh?!
Turns out I wasn’t the only one who didn’t know what PJM meant. A few people chimed in on a local police department listserv to find out the same thing.
Turns out PJM stands for Pennsylvania, New Jersey and Maryland. The electric companies use PJM to refer to the power grids within and between them; Delaware and DC are included within the PJM area.
It reminds me of a bit from “Are You Being Served,” where Captain Peacock reads a memo about tea breaks laden with acronyms to the floor staff. No one can figure out what he’s saying until he explains what the acronyms mean.
The same thing’s happening here. PJM is an insider term; virtually no one would know what it means unless they run in electric company circles. The police commander on the listserv didn’t even know.

