“In the ‘muggle’ world, energy storage is crucial to our future as well, but for more positive reasons. It is the key to greatly expanding the use of renewable energy sources that are intermittent like wind and solar power. Better batteries will mean longer range, lower cost electric vehicles, and will make our entire electricity generation and distribution system more efficient by smoothing out fluctuations in demand.”
Chu touted seven energy-storage technologies DOE is working to develop, including advanced batteries and hydrogen fuel cells.
You can read more about "horcruxes" and energy storage on Chu's Facebook page.