99 percent Invisible -  Grid Locked

1. In the context of this podcast, that does it mean to be an "Electricity Island"

2. What is an "energy only market" and how is it different from most electric grids?

3. Why did ERCOT make the decision to cut power to millions of people during the snowstorm in 2021?

4. What problems compounded the electrical failure?

5. How were electrical bills affected by the power shortages?