Wednesday's ruling by the Hiroshima High Court halting the planned restart of a nuclear reactor in Ehime Prefecture has cast doubt on the judgment of Japan's Nuclear Regulation Authority — which had approved the restart under stricter post-Fukushima guidelines — shocking the government and utilities across the nation.

The ruling deals a heavy blow to a plan by Prime Minister Shinzo Abe's administration to bring more reactors back online, and is sure to prompt the government and utilities to keep a closer eye on similar cases continuing across the country.

Yuichi Kaido, a lawyer representing local residents, called the ruling the "most important" since the Fukushima nuclear disaster, spurred by the Great East Japan Earthquake and tsunami on March 11, 2011.