You can enter your utilites on Schedule C using the instructions below:
•In TurboTax Online Self-Employed, navigate to the Business menu bar.
•Select “Continue” on the next screen.
•Select “I’ll choose what I work on”.
•Select “Start” (or Update/Revisit) under the Business Income and Expenses section.
•Select the “Edit” link next to your business (this is assuming you've already entered a business name, some setup info,etc. If you haven't done this click "+Add a Business" and enter your information).
•Scroll down to the Business Expenses section. Click "Start" next to "Other Common Business Expenses".
•Scroll down to Utilities and click "Start" to enter your utilities for the year.