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 on July 19 we accomplished the Step1 target "Radiation dose 
is in steady decline". Then on December 16 we confirmed the 
accomplishment of the Step 2 target "Release of radioactive materials is 
under control and radiation doses are being significantly held down".
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 3:03 pm on December 20, we stopped the alternative cooling system of 
  the Spent Fuel Pool of Unit 2 due to inspections in the flow rate 
  detector of the system, This is scheduled to last until around 2:00 pm 
  of December 23 and during this time we are expecting that the 
  temperature of the spent fuel pool will rise by 21 °C ( temperature at 
  the time the we stopped the system: 15.4 °C).
 *At 1:40 am on December 21, the alarm went off at the desalination 
  facility (reverse osmosis membrane type) 2-2 which showed that the 
  closing of the backwash water drain valve of the multimedia filter was 
  not conducted within the designated time, which led to an automatic 
  shutdown of the unit. We confirmed at the site that there was no water 
  leak. Since we have enough desalinated water this will not influence the 
  water injection. Desalination facility (reverse osmosis membrane type) 3 
  can be activated. We are now looking into details.
 *At 5:05 am of December 21, decrease in water injection to the reactor of 
  unit 1 was confirmed and we adjusted water injection from the reactor 
  feed water system from approx 4.3 m3/h to 4.5 m3/h, and water injection 
  from the core spray system from approx. 1.8 m3/h to 2.0 m3/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 10:00 am, December 21, 2011) (PDF 239KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress