"the utility" is a correct and usable form of written English.
You could use it when referring to something helpful or useful. For example, "The utility of this tool made it a popular choice among hobbyists."
Dictionary
the utility
noun
The state or condition of being useful; usefulness.
Exact(58)
The utility label is long gone.
The utility of a rigid crust?
Icebreaker privileges the utility of its garments.
The utility was not easy to convince.
The utility sealed the manhole.
(The utility is now the Long Island Power Authority).
How high are the utility payments?
The utility industry criticized the suit.
The utility filled the manhole with sand.
The utility suspended that request by evening.
The utility may just be covering itself.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com