Where are you located? Just wondering.

Here in the US power is sent to our homes as 230 volts, three phase. Our outlets are typically 115 volts, except for ones powering stoves, ovens, laundry rooms, etc. 115v is what you get when you connect only one phase to an outlet. So usually half of a homes 115 outlets are connected to one phase, and the other half are connected to the other phase. The 230 volt outlets use both phases.

I can't imagine our government, or any government for that matter, mandating a change in the power delivered at standard home outlets. You would have to buy all new appliances and electronic devices! Some of our devices allow either 115v or 230v (typically via a switch that you have to set), but the majority of devices do not have this dual voltage capability. It would be a madhouse for the government to force everybody to change. I dare say the government might be overthrown if they attempted something like that!