The ESB cannot cut off an occupied property for non-payment, and the regulator will crucify them if they did.
This is what happens when you're in the special category of sevice providers providing essental human needs. You have to accept the fact that the needs of the individual are more important than the profits of the business.
They won't reconnect unless the debt is paid. Even if the person trying to reconnect isn't the person who owns the debt.
Regulators are pretty useless in Ireland.