Exceptions are when they cannot be put in the tenants' name (I have that for a few of mine, I get the bill, and the tenants pay me that amount) or if you have two units on the same meter so you don't know how much each unit uses.

Are the units separately metered for electric and/or gas?

I'll be extending city water and sewer a few hundred feet up the highway and metering spaces separately.

this would be an opportunity to convert these units to add meters on the 4 units which would cost me upfront but long run it will be saving by assign the electricity back to the tenants to be held responsible to pay the electricity.  

I'm considering purchasing a triplex where two of the units share an electric meter and all three units share a water meter.

The seller sub metered the water about a year ago but has tenants who have yet paid their bill. 

Each home is individually metered electric and water.

I also read somewhere that there may be some monthly fee to get someone to go out to the property to read and reset the meter.

If the tenant the turns it on themselves, the water meter is removed within 24 hours.And then the landlord gets a citation from the local council as you must have water and trash to a property?

I am contemplating in pursuing it once I pay off the 5K by the end of the year.The set back right now are I want to save at least 13 K to add 3 additional water meters.