w_tom wrote:
BTW, utility does not institute a voltage reduction to save
money. Voltage reductions are a last ditch effort to avoid
rolling blackouts.

Or to avoid the expense of bringing additional generating capacity
online, thereby saving money...

All of which is irrelevant to HD protection. Either the
power supply will output correct power or it will shutdown.

A PSU shutting down is not irrelevant to HD protection. Shutdown at the
wrong moment (especially with the wrong operating system) and you end up
with a badly trashed filesystem.