The details tab in the housing units is very extensive, and making sure that our huwans are happy is good. However, digging into that tab in every building to see what's going on is tedious. Perhaps one day that will be fixed in the not-yet-implemented (lol) city dashboard.
In the mean time, is it possible to have housing flash a no-power warning when they don't have power? It's an easy to overlook and easy to fix happiness penalty in the early game.