The cost of charging Tesla depends on the situation but it is almost cheaper to refuel the car. 

 We will consider some important factors to consider to improve your savings. 

Power Tesla requires electricity to charge because it is not surprising that

 the power supply has the biggest impact on the cost of charging. 

 For example utilities can pay their regular electricity bills or opt for options such as

the Community Solar Community Selection Pool (CCA) or

 the Green Power Plan (GPP). 

In general joining Community Solar will

 reduce the cost of charging

 your Tesla each year.