HackingEnergy & UtilitiesUtilitiesTargetedData ExfiltratedIdentity (basic)Government IDFinancial accountMediumContained

MASSACHUSETTS MUNICIPAL WHOLESALE ELECTRIC CO.

bd_9100a37d91cd6d4f · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 2, 2025

Filed

Jul 21, 2025

To disclose

24 weeks

Affected

Linked

5 filings

Confidence

66%

Full breach record for MASSACHUSETTS MUNICIPAL WHOLESALE ELECTRIC CO. →

Massachusetts Municipal Wholesale Electric Company (MMWEC) reported an external system breach occurring between Jan 25 and Feb 3, 2025. Discovered Feb 2, 2025, the incident involved unauthorized access to systems containing names, SSNs/TINs, and financial account info. One Maine resident was notified on July 21, 2025. MMWEC engaged federal law enforcement and provided 24 months of credit monitoring via Experian.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Feb 2, 2025 → Filed with AG Jul 21, 2025169d ✗ ME AG >90d24 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 8 days

discovery → filing · 24 weeks / 169 days

Jan 25, 2025

Begins

Feb 2, 2025

Discovered

Jul 21, 2025

Filed

This filing is one of 5 about the same incident.View merged incident

A leak claim by blacksuit about this victim predates this filing by 169 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Siteblacksuitbd_6b9705041b17d58f2025-02-04 · +167dVerified by operator
Leak Siteblacksuitbd_35040778da5bb0aa2025-02-02 · +169dVerified by operator

Regulatory filings (2) · sorted by filing gap

New Hampshire State AGbd_aeeed58579718a992025-07-21Verified
Massachusetts State AGbd_d70bf31261083a642025-07-21Verified by operator

Name: MASSACHUSETTS MUNICIPAL WHOLESALE ELECTRIC CO.
norm: massachusetts municipal wholesale electric
Domain: mmwec.org
Industry: Utilities

Name: MASSACHUSETTS MUNICIPAL WHOLESALE ELECTRIC CO.
norm: massachusetts municipal wholesale electric
Domain: mmwec.org
Industry: Utilities
Industry: Energy & Utilitiesllm

Discovered: Feb 2, 2025
Breach occurred: Jan 25, 2025 – Feb 3, 2025
Undetected for: 8 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 21, 2025
Affected individuals: 1nationwide
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: External
Regulator citations: Providing written notice of this incident to relevant state regulators
Initial access: exploit_public_facing

During the incident: Notified federal law enforcement regarding the incident
Providing access to monitoring and identity restoration services for twenty-four (24) months through Experian
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Changes made: Working to implement additional safeguards and training to its employees
Reviewing policies, procedures and processes related to the storage and access of personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 24 weeks(169 days from discovery to filing)
Compliance flags: ME AG >90d · 169dME resident >60d · 169dLeak >90d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Feb 2, 2025
→ Filed with AG: Jul 21, 2025
169d 90 days ME AG >90d
Maine
Discovered: Feb 2, 2025
→ Notified: Jul 21, 2025
169d 60 days (analyst band; statutory cap is 30 days) ME resident >60d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Feb 2, 2025 → Filed with AG: Jul 21, 2025	169d	90 days	ME AG >90d
Maine	Discovered: Feb 2, 2025 → Notified: Jul 21, 2025	169d	60 days (analyst band; statutory cap is 30 days)	ME resident >60d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

New Hampshire State AGJul 21 · first

Massachusetts State AGJul 21 · first

Maine State AGJul 21 · first · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/0f58ee81-301f-4339-99be-5fc7e2e5e5c4.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 21, 2025
Raw hash: aa16b58ec7faf5036083898afdcc39eb5c16f94ac1cc1843fd38030c866e8bd6

Linked disclosures

Ransomware claims (2)

Regulatory filings (2) · sorted by filing gap

Reporting entityMASSACHUSETTS MUNICIPAL WHOLESALE ELECTRIC CO.

Victim entityMASSACHUSETTS MUNICIPAL WHOLESALE ELECTRIC CO.

Incidentdiscovered Feb 2, 2025

Stated responseNotified federal law enforcement regarding the incident

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov