Central Maine Power's online bill payment system lets you pay from your computer or phone without writing a check or calling the utility.
CMP's online portal, called CMP Online, is the fastest way to settle your bill if you have internet access. You log in with your account number and password, review your charges, and submit payment in minutes. The system accepts bank transfers and credit or debit card payments, though card payments may carry a small processing fee.
You do not need to set up anything in advance to make a one-time payment. If you want to automate your payments so they happen on the same day each month, you can arrange that through the same portal — but one-time payments work just as well if you prefer to stay in control.
Key Takeaways
- Log into CMP Online with your account number and password to see your current balance and pay immediately.
- Bank transfer payments are free; credit and debit card payments include a processing fee that CMP will show you before you confirm.
- You can set up automatic monthly payments or pay each bill individually — both options are available in the same portal.
- Payments made before the due date shown on your bill avoid late fees; the portal tells you how many days you have left.
Setting up your CMP Online account
If you have never logged into CMP Online, you will need your account number first. Find it on your paper bill in the upper right corner, or call CMP customer service at 1-800-696-1000 if you cannot locate it. You will also need a password — CMP will ask you to create one the first time you log in.
Go to cmpco.com and look for the "Pay My Bill" or "Login" link at the top of the page. Enter your account number and the password you create. Once you are logged in, your current bill appears on the screen, showing what you owe and when it is due.
If you forget your password later, the login page has a "Forgot Password" link that will walk you through resetting it. CMP will send a reset link to the email address on file with your account.
Making a one-time payment
After you log in, select the option to pay now or pay a specific bill. The portal will show you the amount due and ask you to choose your payment method: bank account or card.
If you choose bank transfer, enter your routing number and account number. CMP processes these payments for free, and the money usually leaves your account within one business day. If you choose credit or debit card, enter the card number, expiration date, and CVV. CMP will display the processing fee (usually 2 to 3 percent of your payment) before you submit, so you know the total cost.
Review the amount one more time, then click "Submit Payment" or "Confirm." The portal will show you a confirmation number immediately. Write it down or take a screenshot — you will need it if you ever need to prove you paid on time.
Setting up automatic monthly payments
If you want CMP to withdraw your bill payment automatically each month, log into CMP Online and look for "Autopay," "Automatic Payment," or "Recurring Payment" in the menu. Select the bank account or card you want to use, and choose the day of the month when you want the payment to happen.
Most people choose a date a few days before the due date shown on their bill, so the payment arrives in time but they still have a small window to cancel if something changes. You can stop automatic payments at any time by logging back in and turning off the setting — you do not need to call CMP or send a letter.
Automatic payments do not mean you stop receiving bills. CMP will still mail or email your statement each month so you can check the charges. Reviewing your bill even when you automate payment helps you spot errors or unexpected rate changes.
What happens if you pay late or miss a payment
If your payment does not arrive by the due date on your bill, CMP will charge a late fee. The amount varies but is typically a percentage of your bill or a flat dollar amount — check your bill or call CMP to learn the exact fee for your account.
If you miss a payment and receive a notice, you can still pay online through CMP Online. The portal will show your past-due amount plus any late fees. Paying immediately stops the clock on additional charges and prevents CMP from scheduling a service disconnection.
If you are struggling to pay your bill, CMP offers a budget billing program that spreads your annual costs into equal monthly payments, and a hardship program for customers facing financial difficulty. Call 1-800-696-1000 to ask about these options — they may lower your monthly payment or give you more time to catch up on arrears.
Payment methods and fees at a glance
| Payment Method | Processing Fee | When Money Leaves Your Account |
|---|---|---|
| Bank transfer (ACH) | None | Within 1 business day |
| Debit card | 2–3% of payment | Same day or next business day |
| Credit card | 2–3% of payment | Same day or next business day |
Bank transfer is the cheapest option if you want to avoid fees. If you use a card, the fee appears on your screen before you confirm the payment, so you can decide whether to proceed or use a different method.
Other ways to pay if online is not an option
CMP Online is the fastest method, but you have other choices. You can mail a check to the address on your bill — allow 7 to 10 days for it to arrive and be processed. You can also call CMP at 1-800-696-1000 to pay over the phone with a bank account or card, though a representative will need to walk you through it and the call may take longer than logging in yourself.
Some CMP customers can pay in person at authorized payment centers in their area, though this option is less common than it used to be. Call CMP or check their website to see if a payment center operates near you.
Frequently Asked Questions
What if I pay online but my payment does not show up on my bill right away?
Online payments take time to process. Bank transfers usually appear within one business day; card payments may take one to three business days. If more than three days have passed and you still do not see the payment, log back into CMP Online and look for a transaction history or payment status page. You can also call CMP with your confirmation number to confirm the payment went through.
Can I pay someone else's CMP bill online?
You can pay a bill if you know the account number, but CMP may ask for the account holder's permission or contact information. If you are paying a family member's bill regularly, ask them to add you as an authorized user on their account so you can log in yourself. Call CMP at 1-800-696-1000 to request this.
Is it safe to enter my bank account information on CMP Online?
CMP Online uses encryption to protect your banking details, the same technology banks use for their own websites. Your information is not stored on the page after your payment is complete. If you are still uncomfortable entering your account number, use a debit or credit card instead — the card company's fraud protection covers unauthorized charges.
What if I want to change my automatic payment date or amount?
Log into CMP Online, find your autopay settings, and edit the date or amount. Changes take effect on your next scheduled payment. If you want to stop autopay entirely, turn off the setting in the same menu — you do not need to contact CMP unless you have questions about the process.
Can I get a receipt or proof of payment from CMP Online?
Yes. After you submit a payment, the portal shows a confirmation number on the screen. You can print this page or take a screenshot. You can also log back in anytime to view your payment history and see when each payment was processed. Keep these records in case you ever need to prove you paid on time.