It’s no secret that the electrical grid is aging, but one part stands out from the rest. Transformers haven’t changed much since Thomas Edison made his first light bulb.  Now, a string of startups are working to modernize the transformer, replacing it with modern power electronics that promise to give grid operators more control over how and where electricity flows.  “It becomes a very powerful device, equivalent to your internet router,” Subhashish Bhattacharya, co-founder and CTO of DG Matrix