Cryptocurrency miners can't be trusted to give honest information about the power they use so a group of Senators and Representatives want the federal government to compel them to be transparent.
The sextet said they reached out to seven of the largest cryptomining companies in the US to get information about their facilities, energy sources, consumption, and climate impact of their operations. The group contacted Riot, Bit Digital, Bit Deer, Stronghold, Marathon, Greenidge, and Bitfury. The most notably obfuscated reply came from Riot, and led the letter writers to question self-reported sustainability metrics. According to the letter to the EPA and DoE, Riot told the representatives that its Coinmint facility in Oklahoma ran almost entirely on hydroelectricity.