Nuclear power is 'indispensible' says safety agency
Fukushima's earthquake-hit nuclear power plant is still emitting radiation as workers struggle to cool damaged reactor cores.
The International Atomic Energy Agency is raising concerns about a lack of information from Japanese authorities.
The disaster has severely affected Japan's power supply, and it is unclear how the country plans to restore the lost capacity.
Hidehiko Nishiyama, of Japan's Nuclear & Industrial Safety Agency, explained to the BBC's Rico Hizon how the disaster would affect the future of nuclear power in Japan.