ok, I'll weigh in here since I live in Dallas and have been involved in energy procurement for commercial buildings for about 20 years so have a fair amount of knowledge on the subject.
It was a record cold event. Both temperature and duration. Never seen this before and certainly possible I never see it again.
Yes, much of Texas is on it's own grid. The primary issue this week was the loss of fuel generation capacity. We did lose some renewable energy sources at the same time, but that was a contributing factor, not a primary factor. Many of the power plants in the southern Texas area are not winterized like our northern neighbors. The loss of that generating capacity along with historic demand caused the grid operators to have to shed significant loads to protect the entire grid.
Texas has significant renewable energy generation. A lot of wind and an increasing amount of solar. We do not rely on that, but it certainly helps supplement our traditional fuel generation and it has replaced significant amounts of coal generation.
I would not be considered a radical environmentalist, but I certainly am a fan of being prudent with our resources. Wind and sun are plentiful here and I'm glad we're taking advantage of it.
Some of our issues this week are a result of really cheap electricity here. Generally, the price for electricity for commercial users is about $0.03 per kWh (plus the transmission costs and taxes). That's great for users, but makes it hard to justify the capital necessary to build more generation. Combine that with all the businesses and people moving here and it's not shocking that a historic weather event caused some disruptions.
The storms are behind us and it will be close to 70 here next week so we'll be grilling on our patios next week. And in our garages working on our cars. I'm not discounting the pain and real difficulties we faced this week, but we will get through it. Lessons learned and we'll be better prepared next time. This is Texas.