Last summer I had a situation where power was off only in the hotel property on an extremely hot and humid day from about 11 am to 4 pm. The room got disgustingly hot (southern exposure with no blackout drapes) and since other buildings around us had power, I assume it was the hotel's fault in some sense.

This was a RI and when I went downstairs at the start of their evening reception hour, the manager told me very aggressively that there was nothing due to the power outage. No apology (even in a not taking responsibility way) for either the power/AC issue or the lack of the reception, which wasn't announced at all. It seemed like poor service to me and somewhat surprising in a Marriott (brand standards?). I guess I expected them to try to provide something that day, even if only cold beverages. Of course no points or rate adjustment.