What happens when the power goes out during a sizzling summer without warning?
Expectations of power shortages during peak demand this summer have raised fears of sudden blackouts, causing people and businesses to consider purchasing industrial storage batteries to keep their home and office equipment up and running.
The devastating March 11 earthquake and tsunami that crippled the Fukushima No. 1 nuclear plant and some thermal power plants has clipped electricity supplies for Tokyo and surrounding areas.