I know our DC does load test on the batteries and generators. There are also 5 generators on site. I get all the emails about these tests since they are marked

I know our DC does load test on the batteries and generators. There are also 5 generators on site. I get all the emails about these tests since they are marked low risk. Fun story, small IT company had a natural gas generator installed at the new office they built out. Power went out for the first time, lights go out, generator kicks on, lights turn on, lights turn off. Long story short the electrician didn't have the right breaker size in the truck and used a small one. Building was empty when it was tested which is why bigger DCs have a load generator to test at load.