It seems lack of transmission lines is holding back growth of the electrical grid in the US. Adding new transmission lines is a very expensive prospect. It looks like a good alternative would be to just replace the old, inefficient wires with newer technology. This could quickly double the grid capacity at a relatively low cost. It’s being called “reconductoring”. From Oil Price:
Last year, a study from Lawrence Berkeley National Laboratory called “Queued Up” revealed that at the end of 2022, more than 10,000 power plant and energy storage projects (95% were zero-carbon resources) were waiting for permits to connect to the grid. That’s enough additional capacity to double the country’s electricity output, mostly from clean energy.
