The break-even point is 8c per kWh. But there will be other overheads, so you probably need 6c per kWh to actually make a profit.
Such prices most be possible to obtain in a few oil rich countries like Saudi Arabia and Iraq.
It doesn't include Transmission, distribution, taxes or whatever a "Capacity Charge" is.
If you shut off your bitcoin miners during the warmest parts of the day, your capacity charge will go down.
The bill previous was 3.9.
The majority of those fees are fixed cost so don’t scale linearly with usage.
Of course this is moot when you're not paying the bill, as this story says.
Hourly rates/smart meters were not yet available to consumers (commercial customers could get different plans, IIRC).