I forget all the details exactly, but it was covered in some news coverage early on. The Dai Ni plant kicked off the control rods when the first quake hit and they eventually went into cold shutdown (no rods in the core). Before they can be brought back online they have to undergo full inspection. So, they will be coming back online eventually if all checks out.

They have several power companies that feed power to Japan. One of those third party wholesalers is supposed to be cranking up to provide 150MW, but they did not say how much of an increase that was over their normal provision. They mentioned that a mix of Natural Gas, Coal, and Nuclear are used there, and I want to say that it was 30% of all of Japan is nuclear, but Tokyo was a bit different on it's allotment somehow.