SDG&E preps for high power demand by adding ‘Top Gun energy storage’ facility It's heating up, and SDG&E is preparing for increased power demand throughout the summer. San Diegans could experience "flex alerts" to avoid rolling blackouts. Author: Heather Hope (Reporter) Updated: 6:41 PM PDT July 7, 2021 SAN DIEGO COUNTY, Calif. — Signaling the warning that whenever California sees extremely hot temperatures, we should be prepared for flex alerts unequivocally. San Diegans just took part in the first flex alerts of the year on June 17 and June 18, and now, the California ISO, or Independent System Operator and SDG&E said customers could be called to conserve again and again.