!! History Commons Alert, Exciting News

9:03 a.m. September 11, 2001: Primary Power Is Lost in WTC 7 When the South Tower Is Hit

Primary power is lost and internal alarms warn that there is no water pressure in World Trade Center Building 7 after Flight 175 crashes into the South Tower. [Bylicki, 6/19/2003; Jenkins and Edwards-Winslow, 9/2003, pp. 16 pdf file] WTC 7 is a 47-story office building located about 370 feet north of the North Tower. [National Institute of Standards and Technology, 8/21/2008; National Institute of Standards and Technology, 11/2008, pp. 2] Immediately after Flight 175 hits the South Tower (see 9:03 a.m. September 11, 2001), it loses “primary power,” according to Richard Bylicki, a police sergeant assigned to New York City’s Office of Emergency Management, which has offices in the building. [Bylicki, 6/19/2003] Utility company Con Edison will later specify that two “open/auto” feeders, which distribute power from a substation, go off at this time. [9/11 Commission, 2/26/2004 pdf file] The feeders trip automatically “as a result of collateral damage” caused by the plane hitting the tower, a report by the National Institute of Standards and Technology (NIST) will state. [National Institute of Standards and Technology, 11/2008, pp. 643] However, the building still has electricity, since, according to Bylicki, the power supply “switched to auxiliary generators.” Also at this time, Bylicki will state, the “fire alarm enunciator panel lit up, indicating there was no water pressure for fire suppression in the building.” [Bylicki, 6/19/2003] WTC 7 was built over a Con Edison electrical substation, which now provides power to the entire WTC complex. [National Institute of Standards and Technology, 11/2008, pp. 633] Several Con Edison employees are currently present in this substation. These employees will see “[n]o fire or significant physical damage” there before the site is evacuated, at around 10:20 a.m., according to NIST. [National Institute of Standards and Technology, 11/2008, pp. 357, 640] The electrical power in WTC 7 went off at 8:46 a.m., when Flight 11 crashed into the North Tower, but it came back on after a few seconds (see 8:46 a.m. September 11, 2001). [National Institute of Standards and Technology, 9/2005, pp. 109]

Entity Tags: World Trade Center, Richard Bylicki, Con Edison

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

Ordering 

Time period


Email Updates

Receive weekly email updates summarizing what contributors have added to the History Commons database

 
Donate

Developing and maintaining this site is very labor intensive. If you find it useful, please give us a hand and donate what you can.
Donate Now

Volunteer

If you would like to help us with this effort, please contact us. We need help with programming (Java, JDO, mysql, and xml), design, networking, and publicity. If you want to contribute information to this site, click the register link at the top of the page, and start contributing.
Contact Us

Creative Commons License Except where otherwise noted, the textual content of each timeline is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike