The Hiroshima High Court on Wednesday revoked a lower court decision and ordered the suspension of a nuclear reactor at Shikoku Electric Power Co.'s Ikata power plant in Ehime Prefecture, dealing a blow to the government and utilities that are aiming to bring more reactors back online.

The high court suspension order — the first in a series of similar injunctions — mandates that the plant operator shutter the No. 3 unit at the Ikata power plant until the end of September next year.

The ruling blocks the planned resumption in January of the unit, which is currently offline for regular checks after it was restarted in August 2016.