Its reactors in Unit 2&3 were stopped a while ago for routine inspection. Its restart, originally scheduled for April 2011, was postponed as the electric company failed to obtain the consensus of local population. It became a focal-point of the energy policy debate following the ongoing disaster of Fukushima in recent weeks (from late Jun.) It probably was picked because the Mayor of Genkai Town and the governor of Saga Prefecture are both supportive of the economical gains nuclear plants bring.
For the nuclear industry and its friends, it's vital to restart the power plants after their routine maintenance, compulsory every 13 months. If none of them is able to restart then nuclear power generation in Japan will stop within 1 year.
A series of shady measures were employed by the government and the electric company to try and swing the public opinion, and one of which was disclosed, fueling public anger and anxiety to such an extent now the restart has been postponed.
I will try and cover the story of Genkai Nuclear Power Plant in South-West of Japan in the next few entries, as this story shows the current Japanese political situation quite well.