Hi
Is this sentence natural English?
During hot weather, the city electrical system gets overloaded by the use of fans and air-conditioners.
Thanks,
Tom
PS: Do I need the comma after weather?
No. It's optional.
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Mr. TomPS: Do I need the comma after weather?
I would use it, although as Rover has pointed out above, some consider it optional.
Mr. Tomelectrical system
I would use "power grid" instead; it's more natural.