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It can happen that local problems can contrive to overload particular power stations. Usually this needs some unfortunate coincidence, but it happens. If a power station gets overloaded (usually the generators cannot maintain the 50Hz, or 60Hz in the USA frequency) they have to be shutdown, Clearly this can, and does, result in a cascade failure over a wide area which can take quite a while to sort out.
I don't know the statistics related to local power cuts, but these are often due to local equipment failure which, in turn, can be related to the weather (lines down for example). Often, cuts due to such effects can be kept to a short period by the nature of the grid system that allows re-supply via a different route.
Another one today, although not at my house. Said on the news that it was caused by a transformer fault, what ever that means...
Well, it has left 74000 people without power!
In the event of solar storms, the earth's magnetic field can be disturbed and this can induce huge DC currents in very long-distance powerlines. This can cause big transformers to go into magnetic saturation and then they become hugely lossy and will rapidly overheat if you still try and force AC power into them. This caused widespread blackouts in the USA and Canada a few years ago.