Austin Energy is headed to Mueller with $150M new HQ December 14, 2018December 13, 2018 by myNOI The 275,000-square-foot headquarters will be next to the new Texas Mutual Insurance headquarters. Share on LinkedIn (Opens in new window) LinkedIn Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Print (Opens in new window) Print Email a link to a friend (Opens in new window) Email