Generally, the generation of electricity is unrelated to anything on your bill. Power plant companies generate electricity and sell it to utilities as well as retail electricity providers in deregulated areas. The electricity is then resold to you, the customer. Transmission and distribution is taken care of and charged to you by your utility, regardless of what company supplies the electricity. These charges are separate from the supply portion of your bill.
As a renter, it’s important to know approximately how much electricity you will use each month in order to get the best deal on electricity. Some electricity plans are cheaper for lower energy usage customers, while other plans are designed with high usage customers in mind. If you’re just moving into an apartment, ask your leasing agent to provide you with historic kWh usage information for your specific unit if possible.