Thanks to reader Curious Swede for the following comment, along with the linked report and video.
When transmission costs becomes higher than the production cost of power the transmission business is dead. Companies will start producing their own power an thereby decentralize the grid. In some areas this is about to happen already as the price for solar is coming down. Search for “rethinkx” for an interesting document explaining disruptions currently happening and the drivers for them.
Document: ‘100% Solar, Wind, and Batteries is Just the Beginning’
Or look at this video:
Rethinking The Future — Clean Disruption and the Collapse of the Oil, Coal & ICEV Industries by Tony Seba