Japan will consider keeping some nuclear reactors operating beyond a current 60-year limit as the country focuses increasingly on atomic power as a solution to an ongoing squeeze on energy supply.

Officials are studying a plan to exclude periods when reactors were offline from an existing limit on their lifespan, which would allow some facilities to operate for longer, according to a document released Monday by a trade ministry panel. Reactors are often halted for years to allow the nation’s nuclear watchdog to perform inspections, or as a result of legal challenges.

Following the 2011 Fukushima nuclear disaster, which was triggered by a massive earthquake and tsunami, Japan introduced stricter safety standards limiting the operation of nuclear reactors to 40 years in principle.