Last year, we made a financial projection for the price of electricity long term, with or without decarbonization (“Electricity decarbonization is not that expensive, so let’s get on with it”, Society of Utility and Regulatory Financial Analysts, April 2020). We concluded that decarbonized electricity would cost more primarily because battery storage costs so much. Mind you, we weren’t talking about a big price jump that anyone would notice in the typical family’s budget, for example, but nevertheless, a higher price for clean energy. A number of academic papers have concluded otherwise, but they depended on assumptions that might be optimistic. We wanted to stick with what we knew, and not assume that all would end well. If the high cost of battery storage is one of the major impediments to some type of clean energy transition then what is required is a reduction in the cost of energy storage. […]