This is not why the plant is being shut down. It is reaching end of life, which means that if it wants an renewal on its license, it needs to come into complian

This is not why the plant is being shut down. It is reaching end of life, which means that if it wants an renewal on its license, it needs to come into compliance with modern environmental laws. The key violation for the current plant is its cooling system, which uses once through sea water. To limit the damage to the environment, a modern cooling system would need to be built. When PG&E took bids for new cooling systems, all designs had a construction cost of many billions. Rather than pay for such an expensive upgrade, PG&E made the wise decision to spend that money on cheaper replacements. The problem is that despite having a decade to get things in order, they haven't yet done met the capacity needs for the rest of the state, much less for this capacity retirement.