It might surprise some folks to find the US isn't much different. Although here in the US we're all at 60Hz, we have several regions with different synchronizat

It might surprise some folks to find the US isn't much different. Although here in the US we're all at 60Hz, we have several regions with different synchronization: http://en.wikipedia.org/wiki/Wide_area_synchronous_grid http://en.wikipedia.org/wiki/Wide_area_synchronous_grid So we also have interconnections with limited capacity between the grids. I recall reading about a new interconnection plant being built between three of our grids on the border of NM and TX with superconducting cables, but can't find the link. Maybe someone else can post it.