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 compiled 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) 

- At approximately 8:00 am on May 31, we confirmed oil leakage to the sea 
  around the curtain wall of the water intake canal of Unit 5 & 6 and 
  reported the issue to Futaba Wide-area Fire Headquarters and Fukushima 
  Coastguard Office. As a result of our investigation, we confirmed that 
  oil leaked from pipes around seawall to the port through holes of steel 
  sheet piles and that the leakage already stopped. Since the diffused 
  area was just around the curtain wall and the surface of the sea around 
  Shallow Draft Quay and the oil film was very thin, we confirmed that 
  there is no spread to the outer sea. We completed installing 
  oil-absorbing mat around seawall at approximately 2:00 pm and also 
  completed installing oil fences at 4:50 pm. We plan to protect pipes 
  around seawall and collect the oil. 
- Since we finished monitoring trends of parameters, at 8:30 pm on May 31, 
  we changed the rate of water injection to the reactor of Unit 1 from 
  approx. 6 m3/h to approx. 5 m3/h. 
- On April 16th, in order to check the condition of the water in the spent 
  fuel pool of Unit 2, we collected and conducted a nuclide analysis of 
  approximately 400 ml of water that flowed out of the pool into the 
  skimmer surge tanks, and as a result iodine-131, cesium-134, and 
  cesium-137 were detected. Later we conducted detailed analysis, and on 
  May 31 we concluded that the large portion of spent fuel is sound. 
- At 11:40 am on May 31, we conducted leakage test on the primary system 
  of the alternative cooling system of the spent fuel pool at Unit 2. At 
  5:21 pm on the same day, we started the operation. At 6:11 pm we reached 
  to the rate flow (approx. 100m3/h). Later at 1:47 am on June1, we 
  adjusted the flow rate to 80m3/h. 
  At 5:06 am on June 1, we stopped primary pumps. From 6:06 am, we started 
  fresh water injection through spent fuel pool cooling and filtering 
  system of Unit 2. At 6:53, we finished the injection and at 7:06 am we 
  reactivated primary pumps. 
- On April 12, in order to check the condition of the water in the spent 
  fuel pool of Unit 4, we collected approx. 200ml of the water in the pool 
  using concrete pumping vehicle. On April 13, we conducted nuclide 
  analysis of the sample and detected Cesium 134, Cesium 137, and Iodine 
  131. Later we conducted detailed analysis, and on May 31 we concluded 
  that the large portion of spent fuel is sound. 
- At approximately 2:30 pm on May 31, big sound was confirmed at the 
  southern side of the reactor building of Unit 4, where wireless unmanned 
  heavy machineries were removing rubbles. We confirmed that it was the 
  impact sound when the unmanned heavy machinery tucked and broke some 
  cylinder. Nobody got injured. There was no change in the data of the 
  monitoring post.
- We analyzed strontium in seawater collected on May 9 and detected 
  strontium 89 and 90. 
- On May 31, we sprayed dust inhibitor to the area of approx. 8,750m2 
  including near the main gate.

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 152KB) 

* Revised past progress