He didn't write
continuously running....Or the use of a UPS with over 15 minutes of capacity. (Expensive but exists)
Aside: if the power fails in that period for longer than that in resp. Capelle a/d Ijssel, Rotterdam. Amsterdam and Zaanstad and statistically the Dutch have the least likely to fail grid in the world, that would be neigh impossible. But I think it can be explained with one of the above or a separate generator in place. As is the case in datacenters. (thaddy.com also never went
unintentionally down since 2000) while I and my family suffered big time. Just the sheer fear that all of the freezer.... OMG... too much, too much... All those power-outs.. Try moving to Belgium...