They are most likely part of a demand load shedding program and are being paid to run off generator. 

From: NANOG <nanog-bounces+matthew=corp.crocker.com@nanog.org> on behalf of Eric Kuhnke <eric.kuhnke@gmail.com>
Date: Monday, February 15, 2021 at 5:10 PM
To: "nanog@nanog.org list" <nanog@nanog.org>
Subject: Infomart Dallas is on generator

I have now heard from two reliable sources that Infomart Dallas is presently on generator, and is likely to remain so until the cold weather/electrical supply emergency in Texas has abated. No network impact seen yet.