I don’t know a thing about smart meters, but assuming the electricity meters are common property:
– the tenant can’t change the meter, because he isn’t an owner. Or is the tenant an owner? Sorry am a bit confused there. If the person isn’t an owner then they can’t change anything.
– the owner could apply to the Owners Corporation for approval to change the meter to a smart meter, and agree to a by-law giving him responsibility for that meter going forward.
The meter services that lot, so the owner can ask to change it, provided they take on responsibility for it.