Analysis According to the head of ARPA-E – the research arm of the US Department of Energy – a number of breakthroughs in battery technology have been achieved, with huge implications on the use of renewable energy and electric cars. 
Speaking at an ARPA-E event in Washington DC this week, director Dr Ellen Williams (pictured) told an interviewer: “I think we have reached some holy grails in batteries … we can create a totally new approach to battery technology, make it work, make it commercially viable, and get it out there.”
The research agency has been working for a number of years on completely re-evaluating battery technology from their materials to their designs to their size and weight in an effort to identify new breakthroughs.
Dr Williams claims that has now happened. A number of the projects that the agency has been working on since its creation in 2009 have come to fruition and are lined up to receive private sector funding, she said. She later told The Guardian that energy storage is the “one area where we have delivered big time,” talking about “grid-scale” technology.
If true, the impact could be enormous. Currently, a significant factor holding back renewable energy sources like solar and wind is the fact that energy storage is often inefficient and expensive. When the sun stops shining or the wind stops blowing, that energy source is cut off. With better energy storage, however, the economics of the entire industry would change.