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 10:00 am on December 18, during the patrol activity, a TEPCO employee 
  found an accumulated water in the trench located between the process 
  main building of Centralized Radiation Waste Treatment Facility and 
  Miscellaneous Solid Waste Volume Reduction Treatment Building (High 
  Temperature Incinerator Building). The depth of the water was estimated 
  to be 50 cm and the amount was to be 125 m3. The radiation dose at the 
  water surface was 3 mSv/h (provisional value). As no radioactive 
  materials have been detected during the last sampling survey of sub 
  drain water near the trench, the source of the accumulated water is 
  estimated to be the ground water or dew condensation water. 
  After that we found water inflow from cable duct near the ceiling of the
  trench by detailed survey at site, and we recalculated the amount of the
  accumulated water and it was estimated to be approx. 230 m3. And as a
  result of the sampling, Cesium-134 was approx. 4.2x103 Bq/cm3,
  Cesium-137 was approx. 5.4x103 Bq/cm3 and Iodine-131 was below detection
  limit regarding the radioactivity density of the accumulated water in
  the trench, and Cesium-134 was approx. 1.3x10-1 Bq/cm3, Cesium-137 was
  approx. 1.2x10-1 Bq/cm3 and Iodine-131 was below detection limit
  regarding the inflowing water from cable duct. We have conducted water
  shut-off treatment of the trench and the groundwater level is higher
  than the water level in the trench, therefore we assumed that there is
  no possibility of inflow of the accumulated water in the trench to the
  groundwater. We will conduct investigation continuously and monitor the
  water level in the trench.

· 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 19, 2011) (PDF 417KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress