My back of the envelope calculation is that 1GW for 1 year is 30PJ. Jet fuel has 42MJ/kg with a density of 0.8 kg/L for a total of around 100 million liters of fuel at 100% efficiency. An A321 holds around 30000L which comes out to about 30000 flights equivalent from one reactor. GVA had around 200000 flights in 2018 meaning about 6 1GW reactors equivalent of fuel used (obviously not all flights would be fully loaded but I don't know what a normal load is).
My understanding is that these aren't for intimidation but rather to reduce theft by giving people an outside view of themselves. A mirror can also serve this purpose, but may be more difficult to fit in certain spaces. If this is correct, then these cameras aren't recording, just displaying the image directly on the screen. Here's an article about it https://economictimes.indiatimes.com/blogs/et-commentary/mir...
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