At the scale hypothesized here (major substations, transmission lines), even in Texas. Large equipment that's hard to replace was at one point designed and cer

At the scale hypothesized here (major substations, transmission lines), even in Texas. Large equipment that's hard to replace was at one point designed and certified against IEEE and IEC standards applicable to the global industry, with high safety margin, modeling harsh (to a point, catastrophic) operating conditions. Far beyond the requirements of consumer electronics. And there is no reason to believe a manufacturer capable of this scale (think ABB) would design/build/test a substation transformer from a playbook intended for a global market, and then execute to a lower standard because the customer is in Texas. For clarity, I am not referring to small stuff. Power pole transformers will occasionally blow up. But those get quickly replaced or bypassed without months-long outages.