Due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake which occurred on March 
11th 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 17th, we have put together the roadmap towards restoration from 
the accident and then we updated the roadmap considering the current 
situation, on May 17th. 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 from previous press release 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) 

-Due to the change of onsite power source structure after the restoration 
 of Okuma No. 2 line, power source to electromagnetic valve in Unit 1 
 nitrogen injection line was switched. In order to switch to the temporal 
 power source, nitrogen injection was temporarily suspended at 9:14 am 
 May 25th and was resumed at 9:18 am May 25th. When we suspended nitrogen 
 injection from 3:16pm to 3:18pm on May 25th and checked the operation 
 condition in order to switch to the permanent power source, at 3:45pm, 
 we found that the nitrogen injection compressor was stopped. At 7:44pm 
 on the same day, we started a substitution compressor and injecting 
 nitrogen at about 28m3/h. 

-Due to the stoppage of temporary power panel associated with the above 
 structure change, transfer of water from vertical shaft of Unit 2 turbine 
 building to centralized radiation waste treatment facility was suspended 
 at 9:05am May 25th. At 3:30pm on the same day, we restarted the transfer. 

-At 4:36pm on May 25th, we started to spray water to the spent fuel pool 
 of Unit 4 by the concrete pumping vehicle (We added hydrazine from 4:42pm 
 to 6:49pm). We finished spraying at 8:04pm on the same day. 

-The transfer of accumulated water in Unit 6 turbine building to a 
 temporary tank was started at 9:00am on May 25th. 

-On May 25th, we sprayed dust inhibitor to approximately 8,750 m2 areas 
 including nearby Incombustibles Treatment Facility in a conventional 
 method.

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] 
-Hirono Thermal Power Station Unit 2 and 4: Shutdown due to the earthquake

[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] 
We have worked to restore electricity supply after our nuclear and thermal 
power facilities were severely damaged by Tohoku-Chihou-Taiheiyou-Oki 
Earthquake. This time, we revised that the supply capacity in this summer 
would increase because we could plan to secure an additional capacity. 
However, in order to maintain the policy of avoiding further 
implementation of rolling blackouts during the summer, in addition to the 
above increase of the supply capacity, we sincerely ask for your continued 
cooperation in reducing electricity consumption. Now we are creating 
concrete measures considering "Outline of Countermeasures for Power Supply 
and Demand During Summertime" presented by the Electricity Supply-Demand 
Emergency Response Headquarters of the Japanese government. 
                                                    (Previously Announced)

In the event that an unplanned outage such as excessive continuous 
operation in old plants and a sudden increase of power demand due to 
unusual hot temperature occur, there is a possibility to affect a stable 
power supply. In order to maintain the policy of avoiding rolling 
blackouts, we steadily implement to install additional power capacity we 
have planed, and we continuously do our best efforts to secure supply 
capacity. 

 Appendix: Past Progress (PDF 311KB)  

* Revised past progress