The price of electricity is many times higher in Europe than it used to be only a year ago. There is a very smart way to offset high power bills caused by heating that few are making use of: cryptocurrency mining.
There are products like this on the market:
and
https://bitcoinminingheater.com/
The mining does not even have to be profitable because the main purpose of it is to generate heat and offset heating costs. The other product which is the cryptocurrency can be sold bringing a revenue. As a cherry on top, the cost of the electricity needed to run the miners/radiators is deductible from taxable income. At least where I live crypto mining income is considered earned income.
Here's a detailed study of cryptocurrency mining from a construction engineering perspective:
