Yes I agree to that fact because if something happens that makes the electricity cut off the least you would think of is of course the bitcoins. But I also think that if you really need to do some transactions in that time make sure that you have a battery for your phone because that will do but the thing is the internet connection so you can just transact an offline wallet transaction. But i am oretty sure that you will think of other things if the electricity cut off rather than wondering how can you transact to bitcoins at all