No there are many Bitcoin mining companies that use hydroelectric.
"DMG Blockchain Solutions Inc and Argo Blockchain Plc have announced the establishment of the world's first Bitcoin mining pool powered by clean energy – specifically hydropower."
"World’s Largest Independent Hydropower Generator Enters Bitcoin Mining
Russian energy company, En+ has jointly set up a bitcoin mining facility with BitRiver in Bratsk."
In 2020 CCTL only Mined $19k in Bitcoin - so CCTL can only be considered hobby mining.