“What they found is that there’s simply no way for the states to do it without enhancing the power grid. The model also showed that regional and national approaches to transmission—rather than leaving each state to its own devices—would allow every state to meet the emission-reduction goals with 30 percent fewer renewables than they would need otherwise. In other words, we’ll save money by building renewables in the best locations, building a unified national grid, and shipping zero-emissions electrons wherever they’re needed.”