Due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake which occurred on March 
11, 2011, TEPCO's facilities including our nuclear power stations have 
been severely damaged. We deeply apologize for the anxiety and 
inconvenience caused.
With regard to the accident at Fukushima Daiichi Nuclear Power Station, on 
April 17, we have compiled the roadmap towards restoration from the 
accident and then we updated the progress status of roadmap considering 
the current situation, on July 19. Accomplishment of the Step1 target 
"Radiation dose is in steady decline" has been confirmed. On November 17, 
we updated the further progress. 
By bringing the reactors and spent fuel pools to a stable cooling 
condition and mitigating the release of radioactive materials, we will 
make every effort to enable evacuees to return to their homes and for all 
citizens to be able to secure a sound life.

Below is the status of TEPCO's major facilities.

* Updates since the previous press release underlined.

[Nuclear Power Station]
· Fukushima Daiichi Nuclear Power Station: Unit 1 to 3: shut down due to 
  the earthquake
  (Units 4 to 6: outage due to regular inspections)

* At 10:00 am on December 13, we started to transfer the water accumulated
  in the basement of Unit 6 Turbine Building to the temporary tank.

* At 11:04 pm on November 25, the alarm of spent fuel pool alternative 
  cooling system of unit 4 went off and the device was automatically shut 
  down. We inspected the facilities and found out that the alarm went off 
  for detecting a leak in the Heat Exchanger unit, although we confirmed 
  that no leak had actually occurred. At 11:39 pm we restarted the device. 
  The flow rate detector is in normal operation and we concluded that it 
  was a false alarm for a temporary abnormal condition. We also confirmed 
  that during this period there was no significant temperature rise in the 
  spent fuel pool. Since a similar incident has occurred on November 17 we 
  will further inspect the devices to find out the reason. At 10:07 am on
  December 13, in order to conduct the flow meter inspection for the spent
  fuel pool alternative cooling system in Unit 4, the system was suspended
  (Water temperature at the time of suspension: 23°C). At 11:30 am, the
  cooling was resumed by restarting the system (Water temperature at the
  time of resume: 23°C).

* At 1:18 pm on December 13, hydrazine injection was started to the spent
  fuel pool in Unit 2 through circulating cooling system. At 2:53 pm, the
  injection was finished.

* At 12:25 pm on December 13, recirculation operation for through water
  desalinations (reverse osmosis membrane) was started to contain the
  generation of treated concentrated water.

* At approxi.11:30 am on December 13, we have confirmed that the 11:30
  data was not collected from the transportable monitoring post installed
  at the west gate. Later, we have found out that disconnection of the
  cables was the cause for this communication error. Therefore, we
  reconnected the cables and resumed the measurement the transportable
  monitoring post. As for the data on 12:00 pm, 12:30 pm and 1:00 pm, we
  actually went to the site to conduct the radiation measurement and
  confirmed the result to be equivalent to the data collected prior to the
  disconnection of the cables (approx. 11μSv/h).

· Fukushima Daini Nuclear Power Station:
  Units 1 to 4: shutdown due to the earthquake

· Kashiwazaki Kariwa Nuclear Power Station: Units 5, 6: under normal 
  operation
  (Units 1 to 4 and 7: outage due to regular inspections)

[Thermal Power Station]
· Power supply has returned to normal and facilities damaged by the 
  earthquake are now being handled in a timely manner.

[Hydro Power Station]
· Power supply has returned to normal and facilities damaged by the 
  earthquake are now being handled in a timely manner.

[Impacts on Transmission Facilities]
· Power supply has returned to normal and facilities damaged by the 
  earthquake are now being handled in a timely manner.

[Impacts on Power Supply and Demand Balance]
This winter, there will be some minus factors such as the regular 
inspection of Unit 5 at Kashiwazaki-Kariwa Nuclear Power Station. On the 
other hand, there will be several plus factors such as the recovery of the 
common thermal power stations which suffered the earthquake. As a result, 
we expect to secure 54.9 GW (at the end of December), 54.6 GW (at the end 
of January), 53.7 GW (at the end of February) supply power. 
Compared to the maximum demand in the last winter, which is 51.5 GW, we 
will have 2.2 - 3.4 GW generation reserve margin.

We expect to maintain stable power supply this winter, however, as there 
remains possibilities of unplanned shutdowns at our power stations and 
growth in the demand according to the rapid change in the temperature, we 
would like to ask your reasonable effort to save electricity.

We will continue to make our efforts to maintain stable operation and 
maintenance of the power facilities in order to "prevent in principle" the 
planned blackouts and secure power supply.

Appendix: Past Progress (As of 3:00 pm, December 13, 2011) (PDF 399KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress