Nuclear or solar energy in Japan?

The recent nuclear disaster in Japan forced many countries to rethink about their energy policy. Japan is of course expected to be heavily affected by the Fukushima. However, it is interesting to follow how the country reacts. While many countries in the last decades and energy crises invested on different sources of energy, we heard that Japan had planned to take half of its energy from nuclear energy in 2030. While considering nuclear as a non-renewable source of energy, it was an interesting policy!

Now, Japan has changed their policy and wants to have solar energy for 10 million households in 2020. Let's see if this goal is too ambitious or not!