I heard you've had a lot of power outages because of all the typhoons. That must have been hard.
この場合、次のような言い方ができますよ。
ーI heard you've had a lot of power outages because of all the typhoons. That must have been hard.
「台風のせいでよく停電したと聞きましたが、大変でしたね」
power outage で「停電」
That must have been hard.「大変だったに違いない」=「大変でしたね」
ご参考まで!