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 3:48 pm on December 11, we confirmed that the water was accumulated 
    inside the gate in the house the water desalination apparatus 
    (evaporative concentration apparatus) 2 was installed. Leaked water 
    is approx. 5 litters, kept within the gate. We also confirmed that the 
    leakage has been stopped, and that it was leaked from a ventilation 
    pipe at the tank storing the seal water for the evaporative 
    concentration apparatus 2B. The source of the water is the filtered 
    water (fresh water), and the radiation doses of the surface near the 
    leaked water are 0.12 mSv/h (gamma ray), and less than 1 mSv/h (beta 
    ray), which are the same level as the airborne radiation doses nearby. 
    We will investigate the cause. Desalination apparatus (reverse osmosis 
    membrane apparatus) 2-1 and 2-2 are continuously working, which 
    generate the sufficient desalinated water, therefore, there is no 
    impact on the water injection to the reactors.

  * To switch the power source for the purpose of improving the reliability 
    of power, we suspended the alternative cooling of the spent fuel pool 
    of Unit 1 at 10:20 pm on December 11. Cooling is planned to be resumed 
    in the afternoon of December 12. The temperature of the water in the 
    pool at the time of suspension was 14°C, and we expect the temperature 
    will increase by approx. 3°C due to the suspension.
 
· 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 9:00 am, December 12, 2011) (PDF 390KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress