If tenants are already paying the electric bill then I would switch to a heat pump or install baseboard or wall heaters. 

The time, energy and money investors spend looking can out weigh any discount.

I would love to get something that has already had the plumbing and electric updated and foundation stabilized.  

Currently the water heater tanks are 13 and 9 years old, I plan to swap out the 13 year old one as at that age it is a time bomb.I pay for the water and the electricity to heat the water.Is it possible to pass some of the electric bill onto the tenants by installing some type of point of use water heater in the individual units (1 bathroom in each unit).I was thinking it might be possible to keep the water heaters at a very low temperature (say warm water, but not hot enough to have a shower for example). 

The property owner will certainly be responsible for Repairs, and handle leaks, structural problems, issues with systems like HVAC and electrical, etc...

According the owner's numbers, the building utilities average out to $134/mo for electric/gas, sewer/water and trash.  

Make sure you have enough electrical power as well - gotta juice all those devices!

Under the 20-year power purchase agreement we have to pay SC for electricity usage at fixed rate per kWh escalating every year.

I think you need to plan on carrying some pricing for plumbing, electrical and even HVAC.

trying to keep the positive energy flowing!