Ummm if you follow the links to the EIA’s report, it does not show their method of calculating
The report discusses a few methodologies for estimating the electricity consumption, and if you follow the trail of references, there’s a table of sales and use of electricity by sector. And the data in that table comes from "Form EIA-861, “Annual Electric Power Industry Report.”, Form EIA-861S, “Annual Electric Power Industry Report
(Short Form)” and Form EIA-923, “Power Plant Operations Report”.
So the report discusses a few possible ways to estimate the crypto consumption by using overall sales and usage data. And they give references on finding that data.
The report discusses a few methodologies for estimating the electricity consumption, and if you follow the trail of references, there’s a table of sales and use of electricity by sector. And the data in that table comes from "Form EIA-861, “Annual Electric Power Industry Report.”, Form EIA-861S, “Annual Electric Power Industry Report (Short Form)” and Form EIA-923, “Power Plant Operations Report”.
So the report discusses a few possible ways to estimate the crypto consumption by using overall sales and usage data. And they give references on finding that data.