Today, 40% of America's electricity comes from carbon-free sources. The Democratic presidential candidate has made getting that to 100% by 2035 a centerpiece of his $2 trillion plan to address climate change and create jobs. Getting there would take an enormous expansion of solar and wind capacity in the U.S., backed by mass adoption of energy-storage technologies and hanging onto existing hydroelectric and nuclear plants. A recent study from the Goldman School of Public Policy at the University of California, Berkeley determined that the U.S. grid could use existing technologies - solar, wind, nuclear, hydroelectric dams, and batteries - to supply 90% of its electricity needs by 2035. For more on this, see our press release at the Goldman School of Public Policy.