But there’s broad public support for growing the grid and allowing more electricity, including cheap, clean energy, to come online. The U.S. does not have a big enough power grid to accommodate rising energy demand — a fact that’s making electricity less affordable and reliable nationwide. About two-thirds are in favor of adding more transmission lines to connect clean energy and strengthen grid reliability. Energy costs are climbing in part because of rising power demand from data centers and the electrification of buildings and vehicles. The takeaways could inform how advocates and legislators work to boost public support for clean energy.