Most of the information we currently get about either battery storage or photovoltaic systems we get directly from utilities, which are regulated in the United States, so their information is mostly available to everyone. We also get information in our residential energy consumption survey, which is a more general survey about what energy-using facilities or devices households or commercial businesses have. We try to put all of that together. It's only been in the past four or five years that we've started to put that information out on a more regular basis to make it more widely available as it becomes more and more important in the United States.
On May 3rd, 2018. See this statement in context.