Some executives in the main opposition Constitutional Democratic Party of Japan (CDP) have voiced tolerance for reactivating the country's idled nuclear reactors if they meet certain conditions.

They are appealing to the public with a "realistic approach" at a time when demand for electricity is rising due to the scorching summer heat and energy prices are soaring partly owing to Russia's invasion of Ukraine.

They may also be considering whether there is room for cooperating with the Democratic Party for the People (DPP) — another opposition party open to restarting the suspended reactors — in the next election for the House of Representatives, the all-important lower chamber of Japan's parliament.