Wednesday's court ruling blocking restarts of the No. 3 and 4 reactors at Kansai Electric Power Co.'s Oi plant may embolden opponents of nuclear power nationwide.
It creates a legal precedent and could fuel resistance to restarts, throwing into question whether the administration of Prime Minister Shinzo Abe will be able to push ahead with them as swiftly as planned.
The government earlier asserted that the ruling, by the Fukui District Court, would have no impact on its plans.