Networks of things, from infrastructure systems such as the internet and power transmission grids to human networks often have homogeneous parts and inhomogeneous parts. The heterogeneity can have an impact on the risk of failure (blackouts, disease transmission etc). In this talk we will start with an update on characterizing the dynamics of the power transmission systems and then we will discuss the Power Transmission grid as a case study for the impact of certain types of inhomogeneities and perhaps some of the ramifications of those impacts.