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 i
nconvenience caused.
With regard to the accident at Fukushima Daiichi Nuclear Power Station, on 
April 17, 2011, 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".
In addition, on December 21, 2011, we have compiled the "Mid-to-long-Term 
Roadmap toward the Decommissioning of Fukushima Daiichi Nuclear Power 
Units 1-4, TEPCO".
In addition to the maintenance of the plant's stable condition, we will 
implement Mid-to-Long Term countermeasures towards the decommissioning of 
Fukushima Daiichi Nuclear Power Units 1-4 to enable evacuees to return to 
their homes as soon as possible and reduce the anxiety of the people in 
Fukushima and the whole nation as soon as possible.

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)

· Since December 22, 2011, the atmospheric temperatures at point C of Unit 
  1 Primary Containment Vessel (PCV) monitored by the Containment 
  Atmospheric Monitoring System had risen (the atmospheric temperature of 
  the PCV on December 22 was approx. 38°C, at 7 pm on December 27 was 
  approx. 49°C).  The other temperatures had not risen, so we conducted a 
  survey checking the reliability of the meters from 9 am to 10 am on 
  December 28, and we confirmed that there are no problems.  From 11:00am 
  to 12:15pm on the same day, we adjusted the volume of Nitrogen injection, 
  from approx. 8 m3/h to approx.18 m3/h, and emission of the gas 
  management system, from approx. 23 m3/h to approx.30 m3/h, in order to 
  identify the cause by monitoring the system with the same injection and 
  emission volume as before December 22. The temperature went up to approx. 
  54.6°C at 6 pm on December 28 and fell to approx. 43.5°C at 5:00 am on 
  January 2, 2012. Temperatures at other two points also indicated slight 
  increases but are currently in the stable status.
   Point D: (Maximum) approx. 35.8°C at 5:00 pm on December 29, 2011 → 
            approx. 32.7°C at 5:00 am on January 2, 2012. 
   Point E: (Maximum) approx. 40.0°C at 5:00 pm on December 29, 2011 → 
            approx. 35.8°C at 5:00 am on January 1, 2012. 
  We will continuously conduct the survey for the cause of temperature 
  increase and surveillance of the plant.

· At approx. 5:30 pm on January 1, 2012, we observed approx. 240 mm 
  decrease in the water level of the skimmer surge tank*1 of Unit 4 spent 
  fuel pool in the three hours between 2:00 pm to 5:00 pm (According to  
  the operation record so far, there had been an approx. 50 mm decrease.). 
  As a result of the site investigation later, we did not observe any 
  leakage around the Unit 4 reactor building, connecting points of primary 
  system pipes of Unit 4 spent fuel pool alternative cooling system, or 
  its installation space. The water temperature of Unit 4 spent fuel pool 
  as of 5:00 pm on January 1 is 23°C (22°C as of 5:00 am on January 2). 
  The spent fuel pool alternative cooling system is still in operation 
  and there is no problem in cooling the reactor. Though the water level 
  of the spent fuel pool is kept stable without any problem, the water 
  level in the skimmer surge tank continues decreasing. 
  Therefore, from 10:27 pm to 11:13 pm on January 1, we filled water in 
  the skimmer surge tank. At present, the water level in the skimmer surge 
  tank keeps decreasing approx. 90mm/hour. We will strengthen surveillance 
  on observation of the water level in the skimmer surge tank, increasing 
  the frequency to once in an hour from once in three hours. At the same 
  time, we will continue examination of the causes of the decrease in the 
  water level, such as site investigations based on such possibilities as 
  the water may flow into the reactor well*2 from the spent fuel pool. 
  At present, no leakage is observed outside the building. No significant 
  change is observed in the water level of the accumulated water in the 
  building.

  *1 The tank installed in order to receive the water overflows from the 
    spent fuel pool. The water in the spent fuel pool is overflowed into 
    the skimmer surge tank in order to cool the fuel assembly and remove 
    impurities in the water. The water returns to the spent fuel pool 
    after passing through the heat exchanger and the filter.

  *2 The reactor well is the space which contains the reactor pressure 
    vessel and the lid of the reactor containment vessel. During the 
    periodical inspections, the space filled with water and the fuel is 
    changed. 

· 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, January 2, 2012) (PDF 481KB) 
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB) 

* Revised past progress