The video screen at the Marunouchi subway entrance in Tokyo Station asks passersby to "Please Help Us Save Energy," a plea repeated throughout the nation in television advertisements warning of summer power shortages.
More than three months after the March 11 quake and tsunami triggered the nuclear disaster at Tokyo Electric Power Co.'s Fukushima No. 1 power plant, lights are dimmed and escalators remain shut off in subways and shopping centers.
The push to save energy is also creating opportunities for companies making long-lasting light-emitting diode bulbs and backup power packs.