Reminds me of a company I know that built a brand new data center, put in an over-sized UPS system, over-sized electric generator, state of the art power monitoring/transfer system, and tested the generator bi-annually. Only there were three problems when the area finally suffered a blackout:
1.) They never tested fail-over to the UPS, they had only tested starting up the generator and then manually switched off mainline power once the generator was fully operational to see if it worked.
2.) The UPS installer never bothered to connect the batteries to the power control unit so when power did fail everything immediately lost power (these were racks of large batteries wired together, not the plug-and-play consumer stuff.) When the generator kicked in, everything tried to turn back on at the same time and tripped the breaker. LOL.
3.) The air conditioner was not connected to the fancy power transfer system and after a little over an hour, servers started throttling and eventually shut down from the heat. This all happened in early August on one of the hottest days of that year.