The Illuminating Company
Use the 20-digit Customer Number in the “Charges From The Illuminating Company” section.
Ohio Energy Choice Resource
Ohio Utility Account Numbers
Switching electricity or natural gas suppliers in Ohio usually requires a utility-specific enrollment number. Depending on your utility, that may be called an Account Number, Customer Number, Service Delivery Identifier (SDI), or Choice Service ID. This guide shows which number to use and where to find it on your utility bill.
Reviewed: October 6, 2026 · Enrollment identifiers should always be verified against your current utility bill.
Important: Do not automatically use the account number printed at the top of your bill. AEP Ohio and Duke Energy, for example, use specific service identifiers for retail supplier enrollment.
Quick answer: AEP Ohio generally uses a 17-digit Service Delivery Identifier (SDI), Duke Energy Ohio uses a 22-digit Choice Service ID, AES Ohio uses its utility account number with supplier-specific formatting, and Ohio Edison, Toledo Edison and The Illuminating Company use a 20-digit Customer Number. The exact number depends on your local utility.
Find Your Number by Ohio Utility
Select your utility to jump directly to the account-number instructions and bill example.
4 Ways to Find Your Ohio Utility Account or Service Number
1
Check your current bill
Use a recent paper bill or PDF bill. This is usually the best source because it shows the exact utility identifier tied to the service location.
2
Sign in online
Open your utility's online account and view or download the latest bill. The enrollment number may appear on the bill even when the dashboard shows a different account number.
3
Use the utility app
If your utility offers a mobile app, look for billing documents, account details or a downloadable bill.
4
Call customer service
Ask for the exact supplier enrollment identifier needed to switch electricity or natural gas providers in Ohio.
Ohio Utility Number Quick Reference
Use this table before enrolling with a competitive retail electric or natural gas supplier. The number required can differ from the number you normally use to sign in or pay your utility bill.
| Ohio utility | Number used for enrollment | Length | Where to find it |
|---|---|---|---|
| Columbia Gas of Ohio | Account Number | 15 digits | Page 1, top right, above statement date. |
| Columbus Southern Power (AEP Ohio) | Service Delivery Identifier (SDI) | 17 digits | Page 3, below Current Charges; typically starts with 00040621. |
| AES Ohio | Account Number | 11 digits on bill* | Page 1, top right above due date. *For supplier enrollment, omit the final digit according to AEP Energy's reference guide. |
| Enbridge Gas Ohio (formerly Dominion Energy Ohio) | Account Number | 13 digits | Page 1, below Customer Name and Service Address. |
| Duke Energy – Electric | Choice Service ID | 22 digits | Page 3, top right in the Current Electric Usage box. |
| Duke Energy – Natural Gas | Choice Service ID | 22 digits | Page 3, top right in the Current Gas Usage box. This is different from the electric Choice Service ID. |
| Ohio Edison | Customer Number | 20 digits | Below “Charges From Ohio Edison”; typically starts with 080. |
| Ohio Power (AEP Ohio) | Service Delivery Identifier (SDI) | 17 digits | Page 3, below Current Charges; typically starts with 001400607. |
| The Illuminating Company | Customer Number | 20 digits | Below “Charges From The Illuminating Company”; typically starts with 080. |
| Toledo Edison | Customer Number | 20 digits | Below “Charges From Toledo Edison”; typically starts with 080. |
| CenterPoint Energy – Natural Gas | Account Number | 19 digits on bill* | Page 1, below “Your Account Information.” *AEP Energy's guide says to omit the first two and last digit when submitting to a supplier. |
AEP Ohio: Find Your 17-Digit SDI
AEP Ohio customers should pay special attention to the Service Delivery Identifier (SDI). The retail enrollment identifier is not necessarily the 11-digit account number displayed at the top of the bill. Ohio Power SDIs typically begin with 001400607; Columbus Southern Power SDIs typically begin with 00040621.
Ohio Power Company (AEP Ohio)
UseService Delivery Identifier
Length17 digits
Bill locationPage 3, below Current Charges
Do not confuse the SDI with the 11-digit account number at the top of the bill when enrolling with a retail supplier.
AES Ohio Account Number
AES Ohio, formerly Dayton Power & Light, displays an 11-digit account number near the top right of page one. AEP Energy's utility reference guide states that the final digit should be omitted when providing the number for retail supplier enrollment.
AES Ohio (formerly Dayton Power & Light)
Bill shows11-digit Account Number
EnrollmentOmit last digit*
Bill locationPage 1, top right
Duke Energy Ohio Choice Service ID
Duke Energy uses a 22-digit Choice Service ID for supplier enrollment. Electric and natural gas service have different Choice Service IDs, so use the identifier for the commodity you are switching.
Duke Energy – Electric
UseChoice Service ID
Length22 digits
Bill locationPage 3, Current Electric Usage
FirstEnergy Ohio Customer Numbers
Ohio Edison, The Illuminating Company and Toledo Edison use a 20-digit Customer Number, commonly beginning with 080. Look in the “Charges From” section for your specific utility.
Ohio Edison
Use the 20-digit Customer Number in the “Charges From Ohio Edison” section.
Toledo Edison
Use the 20-digit Customer Number in the “Charges From Toledo Edison” section.
Ohio Natural Gas Account Numbers
Ohio's competitive energy market also includes natural gas choice in eligible utility territories. Columbia Gas of Ohio uses a 15-digit Account Number, Enbridge Gas Ohio (formerly Dominion Energy Ohio) uses the legacy 13-digit account-number format referenced in supplier guides, Duke Energy uses a separate 22-digit natural-gas Choice Service ID, and CenterPoint Energy uses an account number with special enrollment formatting. Always match the identifier to the gas utility and supplier instructions.
Account Number vs. Meter Number: Do Not Confuse Them
Your meter number identifies the physical electric or gas meter at the property. It is generally not the number a competitive supplier needs to enroll your account. Supplier enrollment normally uses a utility-specific Account Number, Customer Number, SDI or Choice Service ID.
Paperless billing?
Sign in to your utility account and download the most recent PDF bill. The PDF often contains the enrollment identifier even when the online dashboard does not display it prominently.
Just moved?
Wait until the utility account is active, then check your online account or call the utility and ask for the identifier required for competitive supplier enrollment.
Old bill?
A recent bill is best. Account identifiers can change after a move, account transfer or utility-system update.
Ohio Utility Account Login & Customer Service
If you cannot locate the number on your bill, sign in to your utility account or contact the utility directly and ask for the number required to enroll with a competitive supplier.
AEP Ohio
Customer service: 800-672-2231
AEP Ohio My Account
AES Ohio
Residential customer service: 800-433-8500
AES Ohio MyAES
Duke Energy Ohio
Ohio/Kentucky customer service: 800-544-6900
Duke Energy My Account
Ohio Edison
Customer service: 800-633-4766
FirstEnergy account & billing
The Illuminating Company
Customer service: 800-589-3101
FirstEnergy account & billing
Toledo Edison
Customer service: 800-447-3333
FirstEnergy account & billing
Columbia Gas of Ohio
Customer service: 800-344-4077
Columbia Gas Manage Your Account
Enbridge Gas Ohio
Customer service: 800-362-7557
Enbridge Gas Ohio Manage Your Account
CenterPoint Energy Ohio
Customer service: 800-227-1376
CenterPoint Energy My Account
Why Your Ohio Supplier Needs This Number
The utility identifier connects a supplier enrollment request to the correct service account. Choosing a competitive supplier changes the company providing the energy supply portion of eligible service; your local utility continues to handle delivery infrastructure and utility billing functions as applicable. Providing the wrong identifier can delay or prevent an enrollment.
Privacy tip: Treat your utility account number, SDI, Choice Service ID and customer number as private account information. Share them only when necessary with your utility or a supplier/broker you intend to work with.
Ohio Utility Account Number FAQs
What number do I need to switch electricity suppliers in Ohio?
It depends on your local utility. AEP Ohio uses an SDI, Duke Energy uses a Choice Service ID, FirstEnergy utilities use a Customer Number, and AES Ohio uses its account number with the enrollment formatting described above.
Is my utility account number the same as my supplier enrollment number?
Not always. This is especially important for AEP Ohio and Duke Energy customers. Use the utility-specific identifier shown in this guide and confirm it on your current bill.
Where is the AEP Ohio SDI?
For Ohio Power, the 17-digit SDI is generally on page three below Current Charges and begins with 001400607. Columbus Southern Power uses a 17-digit SDI that generally begins with 00040621.
Where is the Duke Energy Choice Service ID?
For electricity, look on page three in the Current Electric Usage box. Natural gas has its own separate Choice Service ID in the Current Gas Usage box.
What number do Ohio Edison, Toledo Edison and The Illuminating Company use?
These FirstEnergy Ohio utilities use a 20-digit Customer Number, generally beginning with 080, shown in the applicable “Charges From” section of the bill.
Can I use an old bill?
A recent bill is best because it reflects your current account and service information. If your account has changed, confirm the identifier with the utility before enrolling.
Can I find my Ohio utility account number online?
Usually. Sign in to your utility's online account and open or download the latest bill. The bill may contain the supplier enrollment identifier even if the dashboard shows only a shorter account number.
Is my meter number the same as my utility account number?
No. A meter number identifies the physical meter. Supplier enrollment generally requires the utility-specific Account Number, Customer Number, SDI or Choice Service ID.
What if I just moved and do not have a utility bill yet?
Once your utility account is active, sign in online or call the utility. Ask specifically for the identifier needed for competitive supplier enrollment.
What if I use paperless billing?
Download the latest PDF bill from your utility's online account. PDF bills usually contain the same account and service identifiers that appear on mailed bills.