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Green Mountain Power data breach

Green Mountain Power, a Vermont utility, reported a data security incident on September 4, 2026, which exposed sensitive customer information. Individuals whose data was compromised face potential risks of identity theft, financial fraud, and targeted phishing attempts.

Incident readout

Company
Green Mountain Power
Reported to
Vermont Attorney General
Filed
September 4, 2026
People affected
Not stated in the filing
Incident type in filing
Not stated
Our review
Monitoring
Read the official filing

Was this a ransomware attack?

The filing does not say ransomware was involved. We do not label an incident ransomware unless the company’s report says so. Whatever the cause, the steps to protect yourself and the legal question are the same.

Information listed in the filing

  • Full Name
  • Social Security Number
  • Date of Birth
  • Mailing Address
  • Financial Account Number
  • Routing Number
  • Energy Consumption and Usage History
  • Email Address

What we know

Green Mountain Power, an essential energy provider in Vermont, has confirmed a data security incident reported on September 4, 2026. While the specific nature of the breach remains under investigation, it has led to the unauthorized access of customer data. This incident highlights the ongoing challenges utility providers face in safeguarding sensitive consumer information within their complex digital infrastructures.

The official filing indicates that the exposed data includes Full Name, Social Security Number, Date of Birth, Mailing Address, Financial Account Number, Routing Number, Energy Consumption and Usage History, and Email Address. This combination of personal and financial details is highly valuable to malicious actors. Such information can be used to commit various forms of fraud or identity theft, or to launch sophisticated phishing campaigns.

For those affected, the exposure of Full Name, Social Security Number, Date of Birth, and Mailing Address creates a significant risk of identity theft, where criminals might open new accounts or file fraudulent tax returns in your name. The compromise of Financial Account Number and Routing Number directly threatens your bank accounts, potentially leading to unauthorized transactions. Furthermore, Energy Consumption and Usage History could be exploited for targeted scams or to infer occupancy patterns, while Email Addresses are often used for spear-phishing attacks.

Upon receiving a notification letter, it's crucial to act swiftly. Monitor your financial accounts and credit reports for any suspicious activity. Consider placing a fraud alert or freezing your credit with the major credit bureaus to prevent new accounts from being opened. Update passwords for all online accounts, especially those that reuse credentials, and enable multi-factor authentication wherever possible.

Your notification letter from Green Mountain Power serves as formal confirmation that your confidential information was compromised. Understanding the full scope of what happened and your rights as an affected individual is important. We are currently investigating this incident and offer a free, no-obligation case review to help you understand your options.

See every breach reported in Vermont or read what to do after a ransomware attack.

After the Green Mountain Power incident: what to do and your options

What should I do after getting the Green Mountain Power data breach notice?
Keep the letter and the envelope, and note the date it arrived. Freeze your credit with Equifax, Experian and TransUnion, change any passwords the notice mentions, and sign up for any free credit monitoring the letter offers. Then check whether you may have a claim.
How many people were affected by the Green Mountain Power data breach, and what was exposed?
The filing does not give a count of affected people and lists the following information as involved: Full Name, Social Security Number, Date of Birth, Mailing Address, Financial Account Number, Routing Number, Energy Consumption and Usage History, Email Address. Your own letter is the best guide to what was exposed about you, since notices are usually tailored to each person.
Did Green Mountain Power offer free credit monitoring?
Check your letter from Green Mountain Power. If free credit or identity monitoring is offered, the enrollment code and deadline are printed in the notice itself. Because Social Security numbers are listed in this filing, identity monitoring and a credit freeze matter more than usual. Signing up doesn't waive any legal rights you may have.
Where can I see the official Green Mountain Power breach notice?
Green Mountain Power's report is published by the Vermont Attorney General: https://ago.vermont.gov/categories/security-breach-notices#green-mountain-power-2026-09-04 Compare it with the letter you received to confirm the dates and details match.
Can I sue Green Mountain Power over the data breach?
It depends on what was exposed, the law in Vermont and your own state, and whether you've been harmed. Most people take part through a class action rather than suing alone. Keep your notification letter — it's the proof that connects you to the breach.
Do I need a Green Mountain Power data breach lawyer or attorney?
Whether the company's systems were encrypted by ransomware or data was simply taken, the legal question is the same: did it protect your information the way the law requires? An attorney can review your notice for free, and these cases are usually handled on contingency.
Is there a Green Mountain Power data breach class action lawsuit?
Law firms often open an investigation after a breach notice like this one, and a class action lawsuit may follow. This page doesn't confirm that a lawsuit has been filed against Green Mountain Power. You usually don't have to join a class action to be included — if a settlement is reached, class members are notified and can file a claim.
Is the Green Mountain Power data breach letter legit or a scam?
A notice from Green Mountain Power in the mail matches the breach Green Mountain Power reported to the Vermont Attorney General on September 4, 2026. Check that the company name and dates in your letter match that filing. A real notice of data security incident won't ask for your password, Social Security number or a payment — if it does, contact Green Mountain Power through a phone number or website you find yourself.
How much could a Green Mountain Power data breach settlement or claim be worth?
There is no set amount, and no Green Mountain Power settlement is confirmed here. In past data breach settlements, payments depended on what data was exposed and on documented losses — fraud, out-of-pocket costs and time spent dealing with the breach. The filing lists Full Name, Social Security Number, Date of Birth as involved. Keep receipts and records; they're what damages claims are built on.

Other breaches reported in Vermont

Attorney advertising. This page reflects a public regulator filing; it does not mean a lawsuit has been filed or that the company did anything unlawful. Submitting a review request does not create an attorney-client relationship.