It needs including.
With each mast the mobile operators will look at usage, potential length of outages, frequency of outages and then decide on how much reserve power is needed - and even then there will be the cases where an outage exceeds the back-up.
I know of one location where there are now two masts with mutiple operators, multi-frequency transmitters. They have a generator there alongside short term battery supply - but then how much fuel is stored? Do they put in enough for 6 hours, 1 day, 1 week ? All with the risk, being an isolated location, of regular theft.
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