STP Nuclear Operating Co., the nonprofit that runs the South Texas Project Electric Generating Station near Bay City, filed a data security incident notice that the Texas Attorney General posted on Oct 28.

• Who: 1,175 people in total, 1,173 of them Texans, per the filing as reproduced by breach-notice trackers.
• What: names, Social Security numbers, dates of birth and "other" information. People were notified by email.
• When: the filing lists Sep 28 to 29 as the incident window and Sep 29 as the discovery date.
• Plant systems: the notice doesn't say whether operating or safety systems were affected. A Nuclear Regulatory Commission spokeswoman told the San Antonio Express-News the agency "remains satisfied" the plant continues operating safely and securely.

The filing doesn't say how it happened, and STP and its owners (CPS Energy, Austin Energy and Constellation) hadn't responded to the paper's questions. There's no ransomware claim tied to it in what we read.