Green Mountain Energy customer service assists residential and business customers with electricity or natural-gas plans, billing questions, payments, moving and cancellation. The correct telephone number depends on the state and whether the customer already has service.
Green Mountain Energy is generally the energy supplier. Your local utility or Texas transmission and distribution service provider delivers the energy, maintains meters and power lines, and responds to outages and dangerous electrical conditions.
Verified Green Mountain Energy information
- Texas existing residential customers: 1-866-785-4668, available 24 hours a day
- New residential service: 1-833-561-6993, available 24 hours a day
- Texas online support: Live chat is available 24 hours a day through the official website.
- Other states: Use the state-specific table below because numbers and hours differ.
- Official resources: contact directory, customer service center and utility outage directory
Information last checked in August 2026. Always compare the number with the one printed on your current bill before providing account or payment information.
Power outage or dangerous line?
Report an outage to the local utility or Texas delivery provider—not the energy supplier. Stay away from fallen, sparking or damaged power lines. For an immediate threat to life or property, call 911 and notify the local utility from a safe location. Georgia customers who smell natural gas should leave the area and call Atlanta Gas Light at 1-877-427-4321.
Green Mountain Energy customer service numbers by state
| State | Existing residential customers | New service | Published hours |
|---|---|---|---|
| Texas | 1-866-785-4668 | 1-833-561-6993 | 24 hours a day |
| Illinois | 1-800-274-5289 | 1-855-454-6473 | Existing: Monday–Friday, 7 a.m.–7 p.m. CT; new service: 7 a.m.–6 p.m. CT |
| Massachusetts | 1-844-245-9583 | 1-844-853-7531 | Monday–Friday, 8 a.m.–8 p.m. ET |
| New Jersey | 1-844-245-9582 | 1-800-810-7300 | Existing: Monday–Friday, 8 a.m.–8 p.m. ET; new service: 8 a.m.–7 p.m. ET |
| New York | 1-800-636-5690 | 1-877-216-4632 | Existing: Monday–Friday, 8 a.m.–8 p.m. ET; new service: 8 a.m.–7 p.m. ET |
| Pennsylvania | 1-800-286-5856 | 1-855-724-6473 | Existing: Monday–Friday, 8 a.m.–8 p.m. ET; new service: 8 a.m.–7 p.m. ET |
| Georgia | 1-866-785-4668 | Confirm through the official state selector | Confirm the current department hours before calling |
Green Mountain Energy publishes separate contact pages for Texas, Illinois, Massachusetts, New Jersey, New York and Pennsylvania.
Choose the correct support route
- Existing account, bill, payment or plan: Use the existing-customer number for your state.
- Starting new service: Use the new-service number. Review the supply rate, contract length, renewable-energy terms and any early termination fee before enrolling.
- Moving or ending service: Speak with customer service and obtain a confirmation number and effective date.
- Power outage, damaged line or meter problem: Notify the local delivery utility.
- Business account: Use the commercial support section below.
- Written Texas request: Submit the official online contact form. Green Mountain says a reply normally takes up to two business days.
Green Mountain Energy versus the local utility
Green Mountain Energy sells or supplies the energy plan. The local utility owns and maintains the delivery network. This division affects where customers should report a problem:
- Green Mountain Energy: Supply plans, enrollment, renewable-energy products, account questions, supplier charges, moving and cancellation.
- Local utility or Texas TDSP: Outages, downed lines, meters, transformers, service connections and delivery charges.
Texas customers commonly receive one Green Mountain Energy bill containing both energy-supply and utility-delivery charges. In several northeastern markets, the local utility may issue a consolidated bill that lists Green Mountain as the electricity supplier. Separate supply and delivery charges do not necessarily mean the customer has been billed twice.
Texas power outage telephone numbers
Texas customers should identify the transmission and distribution provider printed on their bill.
| Delivery provider | Outage number |
|---|---|
| Oncor | 1-888-313-4747 |
| CenterPoint Energy | 1-800-332-7143 |
| AEP Texas Central or North | 1-866-223-8508 |
| Sharyland Utilities | 1-800-442-8688 |
| Texas-New Mexico Power | 1-888-866-7456 |
Customers outside Texas can identify their delivery company using Green Mountain Energy’s official outage directory or the utility name printed on the bill.
Billing and payment help
Before making a payment, confirm whether the bill was issued by Green Mountain Energy or by the local utility. Green Mountain’s official billing center provides state-specific bill explanations and payment instructions.
Texas residential customers can make a telephone payment through 1-866-785-4668. Available payment methods and possible processing charges should be confirmed before authorizing the transaction.
Unexpectedly high bill checklist
- Compare the billed kilowatt-hours with previous billing periods.
- Check the meter-read dates and the number of days in the billing cycle.
- Confirm the Green Mountain supply rate and whether an introductory or fixed-rate term ended.
- Separate energy-supply charges from local utility-delivery charges.
- Review recurring fees, credits, late fees and prior balances.
- Ask whether the bill was based on an actual or estimated meter reading.
- Request a case number if any charge remains disputed.
Payment assistance and possible disconnection
Customers who cannot pay the full balance should speak with the company shown as the billing party before the due date. Ask about payment arrangements, average billing, deferred-payment options and available assistance programs. Eligibility and program terms vary.
Texas customers can discuss payment arrangements through 1-866-785-4668. A general support line may operate around the clock even when a specialized payment or disconnection department has more limited processing hours.
Payment-scam warning: Do not send gift cards, cryptocurrency or wire transfers to prevent an alleged immediate disconnection. End an unexpected call and independently dial the verified number on your bill or the appropriate number above.
Moving, transferring or cancelling service
Texas customers may request a transfer through My Account on the official Green Mountain Energy website or speak with customer service at 1-866-785-4668. Customers who want to end service can review the official cancellation instructions.
Prepare the following information:
- Account holder’s name and account number
- Current service address
- Requested transfer or termination date
- New or forwarding address, when applicable
- Telephone number and account email address
Ask whether the plan carries an early termination fee and whether the contract provides a moving exception. Do not assume that stopping automatic payments ends the supply agreement. Save the confirmation number, requested effective date and final bill.
Renewable-energy plans and certificates
Green Mountain Energy says its renewable electricity products are backed by renewable-energy certificates, commonly called RECs. A REC represents the environmental attributes associated with qualifying renewable generation. It does not mean that electricity from a particular wind or solar facility travels through a separate wire directly to the customer’s home.
The physical electricity continues to arrive through the regional grid and local utility system. Plan-specific renewable percentages, certification and contract terms should be checked before enrollment. Additional information appears in Green Mountain Energy’s official company history and sustainability information.
Unauthorized enrollment, identity theft or account fraud
Anyone who believes an account was opened or changed without permission should report it through the verified customer-service number for the applicable state. Texas customers can use 1-866-785-4668 and review Green Mountain Energy’s identity-theft instructions.
- Request an investigation and case number.
- Ask for copies of the enrollment authorization or agreement.
- Notify the local utility if the unauthorized change affects its records.
- Keep bills, emails, confirmation notices and complaint correspondence.
- Send identity documents only through an independently verified official channel.
Green Mountain Energy commercial customer service
| Service area | Commercial support | Hours |
|---|---|---|
| Texas | 1-866-280-3603 | Weekdays, 8 a.m.–5 p.m. CT |
| New York | 1-800-455-8545 | Weekdays, 9 a.m.–6 p.m. ET |
| New Jersey and Pennsylvania | 1-888-232-3658 | Weekdays, 9 a.m.–6 p.m. ET |
Business customers can verify the latest information through the official commercial contact page.
Green Mountain Energy complaint escalation
- Use the existing-customer number for the applicable state and request a case number.
- Ask for a supervisor if the first representative cannot resolve the issue.
- Submit a written complaint identifying the disputed bill, service date, prior case number and requested resolution.
- Keep the plan agreement, Electricity Facts Label or terms of service, bills, payment receipts and cancellation records.
- If the supplier or utility does not resolve the matter, submit a complaint to the appropriate state regulator.
Frequently asked questions
Does Green Mountain Energy repair power outages?
No. The local utility or Texas delivery provider maintains the lines and restores power. Green Mountain Energy handles the energy-supply account and plan.
Why are both Green Mountain and a utility listed on my bill?
One company supplies the energy while the utility delivers it. Depending on the state, both charges may appear on one consolidated bill.
Can I cancel by stopping automatic payments?
No. Stopping automatic payments does not necessarily cancel the supply agreement. Request cancellation directly and retain the confirmation.
Does a renewable plan send only renewable electricity to my home?
Electricity travels through the shared regional grid. Green Mountain’s renewable products use renewable-energy certificates to account for the associated renewable generation and environmental attributes.
Who owns Green Mountain Energy?
Green Mountain Energy is owned by NRG Energy. NRG completed its acquisition of the company in 2010.
Green Mountain Energy customer reviews
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Related customer service guides
- CenterPoint Energy customer service – Texas delivery, outage and utility support
- ComEd customer service – Illinois utility and outage support
- Duquesne Light customer service – Pennsylvania utility and outage support
- TXU Energy customer service – another Texas retail electricity provider
CustomerServiceNumbers.com is an independent customer-service information website and is not affiliated with Green Mountain Energy or NRG Energy. Telephone numbers, hours and policies can change. Verify important information through the company’s official website or your current bill.