The best solution that I came up with was to contact the tenant to see if we can resolve it simply first. If that does not work you should contact a real estate attorney that is familiar with local laws to determine what the next action should be.
This in no way constitutes legal advice and there is no client-attorney relationship between us.
If the tenant has not moved utilities into their own name. It is likely an oversight by them. Usually this can be resolved by a simple conversation with them. this will be a lot easier if it is successful than any of the other remedies.
It is important that your lease is clear on who is paying for what utilities. If your lease is not clear and there’s a dispute, most jurisdictions will likely side with the tenant.