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.
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 are underlined. 

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station:
       Units 1 to 3: shutdown due to the earthquake
       (Units 4 to 6: outage due to regular inspections) 

- At 8:30 am on July 18, we started installation work of temporary roofing
  as a countermeasure against rainwater for the roof aperture of Unit 3
  turbine building and completed the work at 3:30 pm on July 22.
- At 4:56 pm on July 22, transfer of accumulated water at Unit 2 turbine
  building vertical shaft to the Centralized Radiation Waste Treatment
  Facility (Process Main Building) started.
- At 4:53 pm on July 22, transfer of accumulated water at Unit 3 turbine
  building vertical shaft to the Centralized Radiation Waste Treatment
  Facility (Process Main Building) started.
- The transfer of accumulated water on the basement of Unit 6 turbine
  building to a temporary tank resumed at 11 am on July 21 and stopped at
  6 pm on July 22.
- At 7:10 am on July 22, the circuit breaker for the bus which supplies
  electricity to a part of power network in the power station opened the
  circuit due to overload, resulting in the power off of the following
  facilities: the alternative cooling facility for spent fuel pool at Unit
  3, monitoring gauges in the reactor of Unit 3 & 4, water treatment
  facilities, Main Anti-Earthquake Building, and the cooling facility of
  common pool. For Main Anti-Earthquake Building, we restore its power
  supply immediately using backup power generator. For reference, this
  event did not affect the following operations: water injection and
  nitrogen gas injection to reactor of each unit, and data of each
  monitoring post.
- Later, we have switched the power supply source and have resumed power
  supply for Main Anti-Earthquake Building at 9:33 am on the same day, for
  monitoring gauges in the reactor of Unit 3 & 4 at 10:35 am, for the
  cooling facility of common pool at 10:40 am on the same day, the
  alternative cooling facility for spent fuel pool at Unit 3 at 11:50 am
  on the same day. At 3:37 pm on the same day, we started water treatment
  system and we resumed water treatment at 3:51 pm. Currently, the cause
  of the event is under investigation.
- On July 23, due to switching power sources for installation of double
  circuits for offsite power sources for Unit 5 and 6, we stopped
  operation, respectively, of the alternative cooling facility for spent
  fuel pool at Unit 3 at 3:24 am, of the cooling facility of common pool
  at 3:46 am, and of water treatment facility at 8:45 am.
- From 4:37 am to 6:08 am on July 23, dust sampling survey was implemented
  for the upper part of Unit3 reactor building, using unmanned helicopter

Fukushima Daini Nuclear Power Station:
       Units 1 to 4: shutdown due to the earthquake

Kashiwazaki Kariwa Nuclear Power Station:
       Units 1, 5, 6, 7: normal operation
       (Units 2 to 4: outage due to regular inspection)

[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.

[Perspective of Power Supply and Demand Balance in this Summer]
In regard to the supply side in this summer, taking in account of the
acceleration of restoration schedule for Hirono Thermal Power Station,
more purchase of privately generated power, and excluding the power supply
from 60Hz areas which had been planned (due to the current difficult
situation), supply capacity outlook is amended to 57.2GW at the end of
July, and 56.1GW at the end of August.
Also, in order to support the supply and demand balance in the Tohoku area,
which suffered severe damage from the quake, we would like to supply
maximum of 1.4GW to Tohoku Electric Power Company by thoroughly
implementing both supply and demand countermeasures. The supply capacity
in this regard will be 55.8GW at the end of July, and 54.7GW at the end of
August.

Estimated peak demand of 55GW for this summer is 5GW lower than that of
last year. This incorporates the saving of electricity from "Outline of
Countermeasures for Power Supply and Demand During Summertime" and
restoration from decrease of production due to the quake.
 
As the occurrence of unplanned outage of aged thermal power stations or
sudden increase of demand due to unexpected high temperature during summer
may cause difficulties in maintaining stable demand supply balance, in
order to continue to avoid rolling blackouts, we will steadily maintain
supply capacity, and continue our efforts on reliable operation and
maintenance of power facilities.

We apologize for the inconvenience this may cause and appreciate for your
cooperation to save electricity.

Appendix: Past Progress (PDF 218KB)

* Revised past progress