Gallery: Power outage across D.C., parts of Maryland

A security guard turn visitors away from the Smithsonian's National Air and Space Museum in Washington, Tuesday, April 7, 2015, after widespread power outages cause many of the buildings along the National Mall to shut down temporarily. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
A security guard turns visitors away from the Smithsonian’s National Air and Space Museum in Washington, Tuesday, April 7, 2015, after widespread power outages cause many of the buildings along the National Mall to shut down temporarily. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik) (AP/Andrew Harnik)
The National Research Council fellowships office director Dr. H Ray Gamble uses his phone during a massive power outage. (Courtesy Morgan Mounts of the National Academy of Sciences)
The National Research Council fellowships office director Dr. H Ray Gamble uses his phone during a massive power outage. (Courtesy Morgan Mounts of the National Academy of Sciences)
Staffers at the National Academy of Sciences gather during a massive power outage. (Courtesy Morgan Mounts of the National Academy of Sciences)
Staffers at the National Academy of Sciences gather during a massive power outage. (Courtesy Morgan Mounts of the National Academy of Sciences)
"We hit the marks in every category — land availability, business friendly environment, labor force, logistics, cultural community fit and so much more," said the University of Maryland's Chief Strategy Officer Ken Ulman. (WTOP File/Jim Battagliese)
University of Maryland students hang out outside after a massive power outage. (WTOP/Jim Battagliese) (WTOP File/Jim Battagliese)
Chris Cellini of Charlotte, N.C., left, lifts his son Aiden Cellini, 5, onto his shoulders after a visit to the Natural History Museum on the National Mall in Washington, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Jacquelyn Martin)
Chris Cellini of Charlotte, N.C., left, lifts his son Aiden Cellini, 5, onto his shoulders after a visit to the Natural History Museum on the National Mall in Washington, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Jacquelyn Martin) (AP/Jacquelyn Martin)
A man checks his cellphone in a restaurant with a sign advertising that the computer is down, as power returns after a brief power outage, Tuesday, April 7, 2015, in Washington. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.  (AP Photo/Jacquelyn Martin)
A man checks his cellphone in a restaurant with a sign advertising that the computer is down, as power returns after a brief power outage, Tuesday, April 7, 2015, in Washington. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon. (AP Photo/Jacquelyn Martin) (AP/Jacquelyn Martin)
A Secret Service rides his bike on Pennsylvania Avenue outside the White House in Washington, Tuesday, April 7, 2015. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.  (AP Photo/Susan Walsh)
A Secret Service rides his bike on Pennsylvania Avenue outside the White House in Washington, Tuesday, April 7, 2015. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon. (AP Photo/Susan Walsh) (AP/Susan Walsh)
Oprah Winfrey gestures up as the lights go out during her speech at the unveiling of the Maya Angelou Forever Stamp, Tuesday, April 7, 2015, at the Warner Theater  in Washington. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.  (AP Photo/Jacquelyn Martin)
Oprah Winfrey gestures up as the lights go out during her speech at the unveiling of the Maya Angelou Forever Stamp, Tuesday, April 7, 2015, at the Warner Theater in Washington. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon. (AP Photo/Jacquelyn Martin) (AP/Jacquelyn Martin)
The National Gallery of Art is visible in the background as visitors to the Smithsonian's National Air and Space Museum wait for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington, to shut down temporarily, Tuesday, April 7, 2015. (AP Photo/Andrew Harnik)
The National Gallery of Art is visible in the background as visitors to the Smithsonian’s National Air and Space Museum wait for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington, to shut down temporarily, Tuesday, April 7, 2015. (AP Photo/Andrew Harnik) (AP/Andrew Harnik)
People ride the escalator into the Metro Center metro stop in downtown Washington, Tuesday, April 7, 2015. (AP Photo/Jacquelyn Martin)
People ride the escalator into the Metro Center metro stop in downtown Washington, Tuesday, April 7, 2015, as power began to return to the area after a brief outage. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Jacquelyn Martin) (AP/Jacquelyn Martin)
Michael and Julie Krieger of Poughkeepsie, N.Y. wait outside the Smithsonian's National Air and Space Museum for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
Michael and Julie Krieger of Poughkeepsie, N.Y. wait outside the Smithsonian’s National Air and Space Museum for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik) (AP/Andrew Harnik)
Visitors to the Smithsonian's National Air and Space Museum wait for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington, to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
Visitors to the Smithsonian’s National Air and Space Museum wait for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington, to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik) (AP/Andrew Harnik)
Visitors to the Smithsonian's National Air and Space Museum wait for it to reopen after widespread power outages caused many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik)
Visitors to the Smithsonian’s National Air and Space Museum wait for it to reopen after widespread power outages caused many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik) (AP/Andrew Harnik)
Members of the Secret Service stand on Pennsylvania Avenue outside the White House in Washington, Tuesday, April 7, 2015. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.  (AP Photo/Susan Walsh)
Members of the Secret Service stand on Pennsylvania Avenue outside the White House in Washington, Tuesday, April 7, 2015. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon. (AP Photo/Susan Walsh) (AP/Susan Walsh)
With the Capitol in the background, transportation maintenance workers check their traffic light system after widespread power outages cause traffic lights to go out and many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
With the Capitol in the background, transportation maintenance workers check their traffic light system after widespread power outages cause traffic lights to go out and many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik) (AP/Andrew Harnik)
Security guards turn visitors away from the Smithsonian's National Air and Space Museum in Washington, Tuesday, April 7, 2015, after widespread power outages cause many of the buildings along the National Mall to shut down temporarily. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
Security guards turn visitors away from the Smithsonian’s National Air and Space Museum in Washington, Tuesday, April 7, 2015, after widespread power outages cause many of the buildings along the National Mall to shut down temporarily. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik) (AP/Andrew Harnik)
Passengers are being told to go to Farragut North due to Metro power outages. (WTOP/Ari Ashe)
Passengers are being told to go to Farragut North due to Metro power outages. (WTOP/Ari Ashe)
A firetruck passes the Metro Center metro stop in downtown Washington, Tuesday, April 7, 2015, as power begins to return to the area after a brief outage. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Jacquelyn Martin)
A firetruck passes the Metro Center metro stop in downtown Washington, Tuesday, April 7, 2015, as power begins to return to the area after a brief outage. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Jacquelyn Martin) (AP/Jacquelyn Martin)
A security guard turns visitors away from the Smithsonian's National Air and Space Museum after widespread power outages caused many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
A security guard turns visitors away from the Smithsonian’s National Air and Space Museum after widespread power outages caused many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik) (AP/Andrew Harnik)
(AP/Andrew Harnik)
(AP/Andrew Harnik)
Power outages have closed Dupont Metro Station but power is starting to come back on.  (WTOP/Ari Ashe)
Power outages closed Dupont Metro Station but power is beginning to return. (WTOP/Ari Ashe)
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A security guard turn visitors away from the Smithsonian's National Air and Space Museum in Washington, Tuesday, April 7, 2015, after widespread power outages cause many of the buildings along the National Mall to shut down temporarily. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
The National Research Council fellowships office director Dr. H Ray Gamble uses his phone during a massive power outage. (Courtesy Morgan Mounts of the National Academy of Sciences)
Staffers at the National Academy of Sciences gather during a massive power outage. (Courtesy Morgan Mounts of the National Academy of Sciences)
"We hit the marks in every category — land availability, business friendly environment, labor force, logistics, cultural community fit and so much more," said the University of Maryland's Chief Strategy Officer Ken Ulman. (WTOP File/Jim Battagliese)
Chris Cellini of Charlotte, N.C., left, lifts his son Aiden Cellini, 5, onto his shoulders after a visit to the Natural History Museum on the National Mall in Washington, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Jacquelyn Martin)
A man checks his cellphone in a restaurant with a sign advertising that the computer is down, as power returns after a brief power outage, Tuesday, April 7, 2015, in Washington. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.  (AP Photo/Jacquelyn Martin)
A Secret Service rides his bike on Pennsylvania Avenue outside the White House in Washington, Tuesday, April 7, 2015. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.  (AP Photo/Susan Walsh)
Oprah Winfrey gestures up as the lights go out during her speech at the unveiling of the Maya Angelou Forever Stamp, Tuesday, April 7, 2015, at the Warner Theater  in Washington. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.  (AP Photo/Jacquelyn Martin)
The National Gallery of Art is visible in the background as visitors to the Smithsonian's National Air and Space Museum wait for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington, to shut down temporarily, Tuesday, April 7, 2015. (AP Photo/Andrew Harnik)
People ride the escalator into the Metro Center metro stop in downtown Washington, Tuesday, April 7, 2015. (AP Photo/Jacquelyn Martin)
Michael and Julie Krieger of Poughkeepsie, N.Y. wait outside the Smithsonian's National Air and Space Museum for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
Visitors to the Smithsonian's National Air and Space Museum wait for it to reopen after widespread power outages cause many of the buildings along the National Mall in Washington, to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
Visitors to the Smithsonian's National Air and Space Museum wait for it to reopen after widespread power outages caused many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Andrew Harnik)
Members of the Secret Service stand on Pennsylvania Avenue outside the White House in Washington, Tuesday, April 7, 2015. The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.  (AP Photo/Susan Walsh)
With the Capitol in the background, transportation maintenance workers check their traffic light system after widespread power outages cause traffic lights to go out and many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
Security guards turn visitors away from the Smithsonian's National Air and Space Museum in Washington, Tuesday, April 7, 2015, after widespread power outages cause many of the buildings along the National Mall to shut down temporarily. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
Passengers are being told to go to Farragut North due to Metro power outages. (WTOP/Ari Ashe)
A firetruck passes the Metro Center metro stop in downtown Washington, Tuesday, April 7, 2015, as power begins to return to the area after a brief outage. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said. (AP Photo/Jacquelyn Martin)
A security guard turns visitors away from the Smithsonian's National Air and Space Museum after widespread power outages caused many of the buildings along the National Mall in Washington to shut down temporarily, Tuesday, April 7, 2015. Widespread power outages affected the White House, State Department, Capitol and other sites across Washington and its suburbs Tuesday afternoon — all because of an explosion at a power plant in southern Maryland, an official said.  (AP Photo/Andrew Harnik)
Power outages have closed Dupont Metro Station but power is starting to come back on.  (WTOP/Ari Ashe)

WASHINGTON — A major power outage is impacting parts of downtown D.C., the National Mall and College Park as well as transportation networks.

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