The Tokyo Electric Power company announced that it will implement planned blackouts to cope with severe electricity shortage in the wake of Friday’s massive earthquake.
Power will be cut off at the 5 predetermined areas served by TEPCO in a rotating order for a fixed period of time. For more information, please refer to the following page (City of Yokohama)or the atttached file.
→http://www.city.yokohama.lg.jp/en/

You can also check the multilingual websites and other media as below.
☆Radio NHK → http://www3.nhk.or.jp/nhkworld/english/radio/program/16lang.html
☆FM WAI-WAI →http://www.tcc117.org/fmyy/index.php
★How to use Disaster Emergency Message Dial (English only)
　http://www.ntt-east.co.jp/saigai_e/voice171/

• ⇒Power Outage in Yokohama City