From the article: > So, the EIA decided it needed a better grip on what was going on. To get that, it went through trade publications, financial reports, news

From the article: > So, the EIA decided it needed a better grip on what was going on. To get that, it went through trade publications, financial reports, news articles, and congressional investigation reports to identify as many bitcoin mining operations as it could. With 137 facilities identified, it then inquired about the power supply needed to operate them at full capacity, receiving answers for 101 of those facilities. > If running all-out, those 101 facilities would consume 2.3 percent of the US's average power demand. That places them on the high side of the Cambridge Center estimates.