Sakaiko Power Station Unit 5 (thermal power plant in Sakai-city, Osaka prefecture, 400MW) underwent periodic inspection from September 16 through November 4, 2014 when the electricity demand was relatively low and stable after mid-summer. Total approximately 8,000 workers, about 250 daily at the largest, work together to pursue periodic inspection activities. If a highly degraded part were missed and determined acceptable, it would lead to an incident or accident. To avoid the case that a plant becomes unable to generate electricity due to imperfect maintenance, engineers are dedicated to intensive inspections for as many as 70,000 parts one by one; sometimes they ride on equipment, sometimes they go under equipment and sometimes they make fine adjustments in millimeter units using a hammer. We will continuously make an exhaustive effort to supply stable and safe electricity to our customers by performing detailed periodic inspection placing top priority on safety.