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".
In addition, on December 21, 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)

 *At 1:28 pm on December 28, we started injection of hydrazine to spent 
  fuel pool of Unit 4 through the circulating cooling system. At 3:07 pm 
  on the same day, we finished the injection.

 *On December 28, we sampled gases in gas management system in primary 
  containment vessel of Unit 2 to analyze nuclides. As a result of 
  nuclides analysis, we evaluated that there is no recriticality since the 
  density of Xe-135 is below the detection limits (1.1x10-1 Bq/cm3) and 
  that indicates the analyzed figure is below the determination criteria 
  for recriticality such as 1 Bq/cm3.

 *Since December 22, one of the atmospheric temperatures 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 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 date, to identify cause with 
  monitoring, we adjusted the volume of Nitrogen injection, from approx. 
  8 m2/h to approx.18 m2/h, and emission of the gas management system, 
  from approx. 23 m2/h to approx.30 m2/h, as of before December 22. The 
  temperature, the maximum went up to approx. 54.6°C at 6 pm on December 
  28, fell to approx. 52.3°C at 10 am on December 29. We are planning to 
  identify cause with monitoring.

 *At 3:22 pm on December 28, we started to transfer accumulated water from 
  the basement of turbine building of Unit 2 to the Centralized Radiation 
  Waste Treatment Facility (Miscellaneous Solid Waste Volume Reduction 
  Treatment Building [High Temperature Incinerator Building] and the 
  Process Main Building).

 *At 3:32 pm on December 28, we started to transfer accumulated water from 
  the basement of turbine building of Unit 3 to the Centralized Radiation 
  Waste Treatment Facility (Miscellaneous Solid Waste Volume Reduction 
  Treatment Building [High Temperature Incinerator Building] and the 
  Process Main Building). At 9:03 am on December 29, we stopped transfer.

·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 29, 2011) (PDF 252KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress