It's still not earning you money to spend electricity because you still have to pay the transfer fee which is around 6 cents / kWh but it's pretty damn cheap nevertheless, mostly because of the excess in wind energy.
Last winter because of a mistake it dropped down to negative 50 cents / kWh for few hours, averaging negative 20 cents for the entire day. People were literally earning money by spending electricity. Some were running electric heaters outside in the middle of the winter.
Unfortunately a ground loop can be expensive, especially for those of us in urban areas.
I read an analysis once that you could never make back the cost on energy saved. Whether or not that’s always true, I know I live in a high cost area with a yard that a drill couldn’t get to, cris-crossed with 80 years of utilities.