TVA took 200,000 customers offline when temps were below zero: WHY?
(dailymemphian.com)
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Did you know at one time they traded power over AOL Instant Messenger? I don't know if they still do, but from 2011 to 2013 I worked at a "Fossil Fuel" power plant running their corporate network security, and I blocked AIM at one point because - who the hell needs AIM at a power plant? I was floored when I found out they used a clear-text play-time messaging service to buy/sell massive amounts of power.
Frankly I'm surprised things lasted this long.
I just did a quick search and found 2 articles mentioning AOL and Yahoo being used to communicate between traders and arrange sales - energy trading. One was 2014 and one was 2017 (when it looks like AIM went away and the traders went to other platforms). BTW - the fossil plant I worked at back then was in CA. I happened to be working in the datacenter the day that line was cut in AZ and threw San Diego (and a bunch of other places) into darkness. It was really nice being in the nice cool (and powered) datacenter...
Note - I didn't trade. I was network security. I only knew about it when I blocked AIM at the firewalls and IPSs and instantly had people in my office.
https://www.floridatrend.com/article/17404/energy-power-traders-in-florida
https://www.tradersmagazine.com/departments/brokerage/what-next-for-traders-saying-goodbye-to-aol-instant-messenger/