We could reduce CO2 emissions by 75% by 2030The United States is a single country, but it doesn’t have a single power grid. There are multiple regional grids that are not that well interconnected, making it very hard to transfer energy from one side to the other, especially over long distances since the lines are mostly alternating current (AC), which isn’t very efficient over large distances. On top of this, the AC cycles on the different grids are not synched, making it even harder to send power across…This is becoming a problem for the rise of renewable energy. Wind and solar power are intermittent sources, as is hydro, to a lesser extent. The best way to dampen that variability is to be able to share power across a very large area, sending energy from regions where there is a surplus to regions where there is a deficit, balancing things out.