"There are many people working on storage—batteries are a form of storage, and there’s a few others, like compressed air, hot metals. But it’s not at all clear

"There are many people working on storage—batteries are a form of storage, and there’s a few others, like compressed air, hot metals. But it’s not at all clear that we will get grid-scale economic storage." Grid-scale storage is the key. Duke Energy is one of the leaders in this effort, at least among the major utilities [1]. [1] https://news.ycombinator.com/item?id=15307767 https://news.ycombinator.com/item?id=15307767