Back up generators must supply electricity for critically important situations.
Some of these will include:
-emergency theater in a hospital,
-military installations,
-phone and communications,
-government buildings,
-industrial processes that require an uninterrupted power supply.

Back up generators, although often expensive to install, will repay themselves many times over. Not being able to function whenever the power supply has been interrupted, can cause incalculable losses -financial and human.
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