This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To subject to an excessive burden or strain.

v. To tax in excess of what is considered appropriate or just.

v. To tax to an excessive degree

v. To overburden

v. To tax or to task too heavily.

To tax too heavily or oppressively; hence, to exact too much from in any way.

v. tax excessively

"But as more EVs replace regular cars, they could overtax the current power grid if they aren't charged at off-peak times."

overtaxed    overtaxes    overtaxing   

tax   

disappointed    risible    overwrought    unstring    overdraw    railway-station    cigar-shaped    rationalize    ill-treating    vestibular