Danny is right, there seems to be a lack of intelligence involved to build 50 reactors in a quake based country like Japan.
Whether it's 50 (55 actually) or 5, any amount of reactors that can potentially meltdown isn't smart to have residing in a quake based area.
The same thing can be said about California. There are 6 active plants in Cali, 2 of which sandwich the highest density of human sprawl on the west coast. LA an San Diego.
Given the fact that California shakes more time of the year than a hairless dog in the winter, you'd think they'd be smarter as well.
They could harness that good ol' Santa Ana wind-power, or invest into more Geothermal power since they have an abundance of ground-thermal activity. But hey, it's classic American capitalism that prevents them from doing the right thing.
California, in general, is in turmoil. Not as bad as some states but it's pretty nuts. There are a lot of self interest groups fighting amongst themselves that they fail to see the big picture. Cases in point.

Two Los Angeles area Senators want to divert roughly 2.5 billion federal dollars earmarked for high speed rail towards widening the 99 highway. They're arguing the bill at the capital as this post goes up. In essence, they want to encourage more drivers on the road adding to pollution instead of encouraging a high speed rail transit system designed to take people
off the road and preserve the air.

Recently, the waste water management board forced a rate increase in the Sacramento region to pay for a new water treatment plant. Too bad the water isn't intended to go back to the local residents. Instead, it's part of a much larger plan to divert water from the delta (a large tributary somewhere between Sacramento and Los Angeles that is home to a large section of wild life and farms) and pump it directly to Los Angeles. Naturally, Los Angeles residents aren't paying for this "improvement".
Governor Brown is getting rid of a compensation plan that compensates schools for lost tax dollars that end up in the local government redevelopment and improvement agencies. To protect their "assets", many local governments are shuttling the assets (money and property) to other local agencies and tying them up. Naturally, if the state government cuts funding, it'll kill already struggling schools so many of the local agencies aren't really thinking the whole thing through.
Back on topic. The whole energy thing is one big ball of bull ---steaming pile of meadow muffin---. People don't want to look at "ugly" turbines (and they kill migrating birds) but insist on clean solar panels. We can't install solar panels because it'll harm wild life when the installation goes in and it'll kill the ultra rare plants under the panels (it still hasn't occurred to anybody to install them on roofs apparently). Can't burn coal or oil because of the pollution.
I don't know why California don't expand their geothermal capabilities. It only makes up about 4.5% of our consumption but California houses about 2/3 of the U.S.'s total geothermal capabilities and California is one of the only ones that uses dry steam. Hell, New York still operates steam piping. Nuclear power is born out of the frustration of getting anything with decent capacity in. In California, Geothermal is probably the
only source of energy I haven't heard any environmentalist, GenXers or Money Mongers ---smurfette--- about and it makes up such a tiny tiny amount of energy that's consumed. I don't know the numbers but I can't imagine geothermals expanding much more than it already is.
California can do so much to reduce their consumption but they won't do it. It's home to some of the most lavish living the the U.S. that I don't see that changing any time soon.