here's our correspond, roland buerk. >> once it was a symbol of japan's belief in a nuclear future. the biggest nuclear power station in the world. we were taken through the heavy, water-tight doors, into the maze of corridors inside, right to the control room for the reactors, built to power tokyo. once by one, all japan's nuclear power stations have been shut down, and now the output is zero. this is the very heart of their power station. that music is a warning that the air lock is open. over here, that water, that's the pool where the spent nuclear fuel, still radioactive, of course, is being stored. next to it, that circular structure, that's the top of the reactor itself. now, before the disaster at fukushima, japan relied on nuclear power for nearly a third of its electricity. the nearby town now faces a choice between fear and economic collapse. the power station is the biggest employer, but like other local communities, they're reluctant to allow it to be restarted, wary of another fukushima. but the lights must be kept on in tokyo, a glistens metropolis that consumes vast

our correspondent, roland buerk, look at japan's hopes for another chance to put on the games. >> tokyo lost out to re toe host the 2016 games -- lost out to rio to host the 2016 games, but the city is trying again for 2020. even a large, expanse of land vacant and ready for the construction of new stadiums to take place. the site is spectacular, next to tokyo bay, with a view of the skyline across the water and mount fuji in the distance. tokyo certainly has the money. this is the most populist urban area in the world, and the city's economy was only recently overtaken by the entire country of india. with a bullet train and subways and expressways, the infrastructure is in place, and the olympic committee might feel that after last year's earthquake and tsunami, awarding tokyo the olympics would be a good way of helping japan to recover. but what might help is this city has hosted the games before, in 1964. and about the winter olympics in 2018 due to take place in south korea, awarding the 2020 games to tokyo would mean two consecutive olympics taking place in the same part of the wor