Using Electricity in an Office Building
My daughter asked me this question:
Yesterday, I had a meeting in Town A and then went straight to Town B for a wedding. My friend from Town A works in an office building there, so I changed and did my hair and makeup in the building where she works. That means I plugged in my curling iron in their bathroom…
Do you think it was a problem of me using their electricity?
If yes, how do you think I can go about fixing it?
The common accepted custom is for a one who works in an office to have authority to use the facilities in a normal fashion, which would include allowing a friend to use the washroom, electric outlet etc. which is a negligible amount of electricity and a common courtesy extended by the average person.
This would make what you did halachically acceptable.