At the edge of Humboldt Bay in northern California lies a relic from the heyday of U.S. nuclear power. The reactor was shut down in 1976. The remaining cost to decommission the plant once and for all -– cleaning up lingering radiological dangers, dismantling the remains — will be about $441 million, according to its owner, PG&E Corp. The question is who will pay — for Humboldt Bay, and for dozens of other reactors that are in the process of closing or might soon. Nuclear operators like PG&E are supposed to lay up enough money to cover the costs, similar to how corporations fund pensions. Turns out, most haven’t. PG&E’s Humboldt Bay trust fund, for instance, is currently $308 million short, according to a company […]