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, 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. 43.3°C at 11:00 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. 32.6°C at 11:00 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 11:00 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.
  By further investigation, we confirmed that amount of water that is 
  equivalent to decreased water level of the skimmer surge tank and amount 
  of water that is equivalent to increased water level of the reactor well*2 
  are almost the same and the water level at reactor well is lower than 
  that of the spent fuel pool.  With these facts, we estimate that 
  situation of gate between the reactor well and the spent fuel pool 
  changed and water flow from the spent fuel pool to the reactor well 
  increased made decrease in water flow from the spent fuel pool to the 
  skimmer surge tank, and so decrease in water level at the skimmer surge 
  tank was more than usual.  To decrease the difference between the water 
  level of the reactor well and that of the spent fuel pool, we put water 
  into the reactor well from 11:50 am to 11:59 am on January 2.  As of 4:00 
  pm, we can not find decrease in the water level of the skimmer surge tank.  
  We will continue surveillance the water level of the skimmer tank. 

  *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 4:00 pm, January 2, 2012) (PDF 263KB) 
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB) 

* Revised past progress