Diablo Canyon is the last operating nuclear power plant in California — and arguably the most controversial. The plant sits along the scenic Central Coast and is surrounded by fault lines — one of which runs as close as 2,000 feet to the nuclear reactors. Many fear that a single earthquake could cause a repeat of the 2011 Fukushima disaster in Japan, when a tsunami devastated a nuclear plant. But despite decades of public protest, the plant's operator PG&E insists that the facility is not only seismically sound, but essential.