At 1 am March 19 JST (12:00:00 Noon Friday March 18 ET), TEPCO has reported that

“As of March 18th , power from offsite transmission line has received until temporary substation for backup power. Now, cabling to unit receiving facility is underway.“

JAIF reported at 10 am March 19 (09:00:00 p.m. Friday March 18 ET) that

External power supply of Unit-1 and 2 are scheduled to be connected … March 19. Unit 3 to 6 are scheduled to be connected … March 20.

Reuters reports that

“TEPCO has connected the external transmission line with the receiving point of the plant and confirmed that electricity can be supplied,” the plant’s operator, Tokyo Electric Power Co, said in a statement.

Another 1,480 meters (5,000 feet) of cable are being laid before engineers try to crank up the coolers at reactor No.2, followed by numbers 1, 3 and 4 this weekend, company officials said.

BBC reports that

Engineers have now connected a power cable to the outside of the plant.

Further cabling is under way inside to try to restart water pumps in four of the six reactors.

A nuclear safety agency official said: “We are scheduled to restore electricity at number one and two [reactors] today.

“Reactors number five and six also will be powered today [Saturday]. They are scheduled to restore power to number 3 and 4 tomorrow (Sunday).”

I understand this to mean that TEPCO has created a temporary substation next to the plant and has confirmed that it has power running from nearby transmission lines to the temporary substation.  It still has to lay and connect power cables from the temporary substation to pumps and other equipment within Units 2, 1[Saturday] and 3, and 4 [Sunday].