As noted in one of the links I posted, its a combination of Texas plus Windmills. In Canada, and North Dakota, where they get sub zero temps through most of the winter, there is very little chance of their windmills freezing up, because there is little HUMIDITY. What humidity there is falls as snow. There is no freezing rain, freezing fog, freezing condensation. Thus their windmills don't freeze up. Also, their windmills are fitted with blade heaters. IF in the small chance they get ice on the blade, they STOP the windmill, let the blade heater melt the ice, then turn it back on. ERCOT .. should have taken WIND off line and let the fossil fuel units carry the entire load. As the San Angelo Live link noted, ERCOT management failed to monitor the grid correctly.