Sorry but that's just not right.....It's pretty obvious just looking at the actual ERCOT production data both 1 week before and during the Arctic Outbreak which energy source failed and which came to the rescue/ramped up.
Since 2014 ERCOT retired 5GW of coal generation. Peak demand has grown by 9 GW since and to fill the gap, ERCOT decided to replace with 15 GW of wind. Gas generation was built as basically backup for new wind generation which almost entirely failed this week. The shift to wind is the number 1 culprit in making our grid less reliable.