I have heard all sorts of estimates on how many are without power, but the most common one is 6 million with no power, which means 6 million that might not have heat...
CNN reporting from Sendai, saying that there were many trying to get out. Fuel rationing to 10L of gasoline, very long lines at gas stations and supermarkets that are still working. petro chemical facility burning outside the area and it seems to be burning worse than it was an hour ago, because they can't reach it to put it out. The footage from Sendai is the worst I personally have ever seen.
ETA: The rationing statement is not official, but what the reporter said was "People are waiting an hour just to get their 10 L of petro." Seems like rationing to me, however do not take that as official.
International Red Cross has deployed 400 volunteers. Trouble getting to people that need help, trying for 36 hours due to roads that are out and heavy congestion on road that are working.
360 km of coastline affected, and those are the hardest to access.
Sendai has no power, 5 million in that area without light, 1 million without running water. Life in Tokyo is normal-ish.
Priority is to save lives, find those that are trapped. Others are still surrounded by water, and evacuation efforts are ongoing. Temporary centers are holding millions of people, all of whom need food clothing, water, shelter, tents have been set up. Some need medical care and many require intense psychological care. Water and food is low in areas like Tokyo.