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Green Mountain Power data breach investigation

Green Mountain Power recently filed notice with the Vermont Attorney General confirming a data breach affecting its customers. This incident involved the exposure of sensitive personal information, creating significant risks for identity theft and financial fraud. Affected individuals should understand their rights and the potential implications of this data compromise.

Filed
September 4, 2026
Regulator
Vermont AG
People affected
Not stated
File status
Monitoring

What the filing confirms

  • Green Mountain Power reported the incident to the Vermont Attorney General.
  • Information involved: Full Name, Social Security Number, Date of Birth, Mailing Address, Financial Account Number, Routing Number, Energy Consumption and Usage History, Email Address.

Still unknown

  • How many people were affected. The filing does not give a number.
  • What caused the incident beyond the description in the filing.
  • How the attackers got in, and whether basic safeguards such as multi-factor sign-in were in place.
Read the filing at the source

Investigation notes

On September 4, 2026, Green Mountain Power formally reported a data security incident to the Vermont Attorney General, confirming that customer data was compromised. While the specific nature of the breach remains under investigation, the filing acknowledges an unauthorized compromise of Green Mountain Power's systems.

The official report indicates that the exposed information includes Full Name, Social Security Number, Date of Birth, Mailing Address, Financial Account Number, Routing Number, Energy Consumption and Usage History, and Email Address. The exposure of such critical personal and financial details creates serious risks for identity theft, fraudulent financial transactions, and targeted scams against affected individuals.

As a major utility provider in Vermont, Green Mountain Power is entrusted with sensitive consumer data and is subject to strict data protection regulations. The occurrence of this breach raises questions regarding the adequacy of the company's cybersecurity safeguards, the duration of unauthorized access, and the timeliness of customer notification. Our firm views this incident as an ongoing investigation into Green Mountain Power’s compliance with its legal duties to protect customer information.

If you received a data breach notification letter from Green Mountain Power, it confirms that your personal information was part of this compromise. We strongly advise monitoring your financial accounts and credit reports for any suspicious activity. You may also be entitled to compensation for damages resulting from this incident. We are currently investigating claims on behalf of affected individuals and offer a free, no-obligation case review to discuss your legal options.

What our attorneys examine

A cyberattack does not excuse a company from protecting the information it holds. We look at whether Green Mountain Power used reasonable security, how long it kept the data, and how quickly it told the people affected. Those questions decide whether a class action or individual claim is possible. Read more on how ransomware lawsuits work, or browse other incident files in Vermont.

Green Mountain Power data breach questions

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.
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.
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.
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.
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.
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.
Do I need a Green Mountain Power data breach lawyer or attorney?
An attorney can read your notice and tell you whether a claim makes sense. A case review here is free, and data breach cases are usually handled on contingency, so there is no upfront cost.
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.
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 open files in Vermont

Attorney advertising. An incident file reflects a public regulator filing and our review of it; 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.