As population growth and increased electrification rapidly raise demand for power, U.S. electric grids are struggling to keep pace, and the need for more transmission capacity is pressing. The U.S. Congress has delegated its interstate commerce authority to the Federal Energy Regulatory Commission to regulate interstate transmission rates. Meanwhile, states regulate intrastate transmission rates. What is perhaps surprising, though, is the fact that states generally have authority over the siting and construction of interstate transmission lines.