When you identify yourself in the online account process, all accounts attached to you through positive identification (Social Security number, passport or state ID) will be associated with your username or email address. If you receive one DTE Energy bill for both your natural gas and electric service, you need to create only one online account. If you have both residential and business accounts, you will need to use a different email address and password for each account. To switch from one account to another, sign out of the current email address and sign in with the other one.