Brownouts, or the intentional lowering of voltage, is not supposed to be practiced any more. Thats why they are having rolling blackouts out there.
I suppose that shutting down entire sections of the grid on a rotating basis is a better way electrically to reduce the load, but it doesn't seem safe to me, well neither does lowering the voltage to all those internet places out there. But I would suppose it's the the lesser of the two evils.
I would sell the big diesel or natural gas generators rather than change taps.
