The polar vortex is hitting Texas. Much of the power generation and gas distribution was not designed for cold weather. Texas does not have a capacity system in place to pay for capacity in case its needed. This reduces power rates during normal times but a bit of problem during unusual conditions. So here is a snip from the Ercotwebsite today. The forecast demand color is bit hard to see but what it shows is that the grid will run out of power tonight. That usually means brown outs and black outs.