Please note: David Batten has done some work on The difference between Cambridge (CCAF) and Bitcoin Mining Council (BMC) data

The Cambridge Bitcoin Electricity Consumption Index (CBECI) provides an up-to-date estimate of the Bitcoin network’s daily electricity load. The underlying techno-economic model is based on a bottom-up approach initially developed by Marc Bevand  in 2017 that uses the profitability threshold of different types of mining equipment as the starting point.

From the Cambridge Centre for Alternative Finance.