Lower power supplied by home network after power glitch
I would


Check the supply voltage at a wall socket (expecting 230 to 240).


Using a plug-in Kill-a-Watt or similar device or
Using a Cat-II or better-rated good-quality multimeter with care.

Ask neighbours if they have similar problems.
Report the problem to your electricity supplier.


It might be worth looking for any obvious damage at or near the supply-meter or consumer-unit but I'd be surprised if there is visible damage. Anyway, you'd need an electrician to fix damage in or around those items.

(Assuming UK from user name)