10 years after blackout, US grid faces new threats

The U.S. electrical grid is better managed and more flexible a decade after its largest blackout but remains vulnerable to increasingly extreme weather, cybersecurity threats, and stress caused by shifts in where and how power is produced. The following is a slide presentation for the 10-year anniversary of a massive power failure caused the largest power outage in the nation's history, affecting 50 million people in parts of seven states and Canada. (AP)

Manhattan skyline is dark as the sun comes up on the morning after a massive power failure caused the largest power outage in the nation's history, affecting 50 million people in parts of seven states and Canada. (Photo by Mike Albans/NY Daily News Archive via Getty Images)
10 years after blackout, US grid faces new threats
Manhattan skyline is dark as the sun comes up on the morning after a massive power failure caused the largest power outage in the nation's history, affecting 50 million people in parts of seven states and Canada. (Photo by Mike Albans/NY Daily News Archive via Getty Images)
Hundreds of New York residents stand outside Grand Central Station in Manhattan during a blackout that affected the entire city and most of the eastern part of North America August 15, 2003. (Photo by Jose Jimenez/Primera Hora/Getty Images)
10 years after blackout, US grid faces new threats
Hundreds of New York residents stand outside Grand Central Station in Manhattan during a blackout that affected the entire city and most of the eastern part of North America August 15, 2003. (Photo by Jose Jimenez/Primera Hora/Getty Images)
People walk out of downtown Manhattan towards the Brooklyn Bridge during a massive blackout August 14, 2003 in New York City. (Photo by Jonathan Fickes/Getty Images)
10 years after blackout, US grid faces new threats
People walk out of downtown Manhattan towards the Brooklyn Bridge during a massive blackout August 14, 2003 in New York City. (Photo by Jonathan Fickes/Getty Images)
People walk across Brooklyn Bridge during a massive blackout August 14, 2003 in New York City. (Photo by Jonathan Fickes/Getty Images)
10 years after blackout, US grid faces new threats
People walk across Brooklyn Bridge during a massive blackout August 14, 2003 in New York City. (Photo by Jonathan Fickes/Getty Images)
Thousands of New Yorkers walk along the Brooklyn Bridge away from Manhattan August 14, 2003 in New York City. (Photo by Anthony Correia/Getty Images)
10 years after blackout, US grid faces new threats
Thousands of New Yorkers walk along the Brooklyn Bridge away from Manhattan August 14, 2003 in New York City. (Photo by Anthony Correia/Getty Images)
Pedestrians and traffic leaving downtown Manhattan crossing the Queensboro Bridge after the onset of the largest power blackout in American history, August 14, 2003. (Photo by Robin Platzer/FilmMagic/Getty Images)
10 years after blackout, US grid faces new threats
Pedestrians and traffic leaving downtown Manhattan crossing the Queensboro Bridge after the onset of the largest power blackout in American history, August 14, 2003. (Photo by Robin Platzer/FilmMagic/Getty Images)
ÃNEW YORK - AUGUST- 14: (FILE PHOTO) Cars head over the Brooklyn Bridge beside a blacked out New York City skyline August 14, 2003 during a power outage. The New York City comptroller William Thompson estimated August 18, 2003 that the blackout cost the city $1.05 billion including $250 million in perishable food that had to be discarded. The cost does not include overtime to city workers or lost tax revenue. (Photo by Spencer Platt/Getty Images)
10 years after blackout, US grid faces new threats
ÃNEW YORK - AUGUST- 14: (FILE PHOTO) Cars head over the Brooklyn Bridge beside a blacked out New York City skyline August 14, 2003 during a power outage. The New York City comptroller William Thompson estimated August 18, 2003 that the blackout cost the city $1.05 billion including $250 million in perishable food that had to be discarded. The cost does not include overtime to city workers or lost tax revenue. (Photo by Spencer Platt/Getty Images)
Stranded travellers gather in Grand Central Station during a massive blackout August 15, 2003 in New York City. (Photo by Mario Tama/Getty Images)
10 years after blackout, US grid faces new threats
Stranded travellers gather in Grand Central Station during a massive blackout August 15, 2003 in New York City. (Photo by Mario Tama/Getty Images)
All lights are out in Times Square during a massive blackout August 14, 2003 in New York City. (Photo by Matthew Peyton/Getty Images)
10 years after blackout, US grid faces new threats
All lights are out in Times Square during a massive blackout August 14, 2003 in New York City. (Photo by Matthew Peyton/Getty Images)
All lights are out in Times Square during a massive blackout August 14, 2003 in New York City. (Photo by Matthew Peyton/Getty Images)
10 years after blackout, US grid faces new threats
All lights are out in Times Square during a massive blackout August 14, 2003 in New York City. (Photo by Matthew Peyton/Getty Images)
Travellers are lit by an emergency floodlight in Grand Central Station during a massive blackout August 15, 2003 in New York City. (Photo by Mario Tama/Getty Images)
10 years after blackout, US grid faces new threats
Travellers are lit by an emergency floodlight in Grand Central Station during a massive blackout August 15, 2003 in New York City. (Photo by Mario Tama/Getty Images)
Tourists sleep on the sidewalk outside the Renaissance Hotel on Broadway in Manhattan the morning after a massive power failure caused the largest power outage in the nation's history. (Photo by Mike Albans/NY Daily News Archive via Getty Images)
10 years after blackout, US grid faces new threats
Tourists sleep on the sidewalk outside the Renaissance Hotel on Broadway in Manhattan the morning after a massive power failure caused the largest power outage in the nation's history. (Photo by Mike Albans/NY Daily News Archive via Getty Images)
New York City police officer Paul Piotrowski watches over pedestrians leaving downtown Manhattan crossing the Brooklyn bridge during the largest power blackout in American history August 14, 2003. (Photo by Jason Nevader/WireImage/Getty Images)
10 years after blackout, US grid faces new threats
New York City police officer Paul Piotrowski watches over pedestrians leaving downtown Manhattan crossing the Brooklyn bridge during the largest power blackout in American history August 14, 2003. (Photo by Jason Nevader/WireImage/Getty Images)
David Eisenberg tries to catch a ride to Long Island as he stands in Times Square during the largest power blackout in American history, August 14, 2003. (Photo by J. Countess/WireImage/Getty)
10 years after blackout, US grid faces new threats
David Eisenberg tries to catch a ride to Long Island as he stands in Times Square during the largest power blackout in American history, August 14, 2003. (Photo by J. Countess/WireImage/Getty)
Stranded travelers try to keep cool in Grand Central Terminal in New York City, Friday, Aug. 15, 2003, as most of the city woke up without electricity for a second day. (Photo by Paul Hawthorne/WireImage/Getty Images)
10 years after blackout, US grid faces new threats
Stranded travelers try to keep cool in Grand Central Terminal in New York City, Friday, Aug. 15, 2003, as most of the city woke up without electricity for a second day. (Photo by Paul Hawthorne/WireImage/Getty Images)
Stranded travelers try to keep cool in Grand Central Terminal in New York City, Friday, Aug. 15, 2003, as most of the city woke up without electricity for a second day. (Photo by Paul Hawthorne/WireImage/Getty)
10 years after blackout, US grid faces new threats
Stranded travelers try to keep cool in Grand Central Terminal in New York City, Friday, Aug. 15, 2003, as most of the city woke up without electricity for a second day. (Photo by Paul Hawthorne/WireImage/Getty)
Stranded travelers try to keep cool in Grand Central Terminal in New York City, Friday, Aug. 15, 2003, as most of the city woke up without electricity for a second day. (Photo by Paul Hawthorne/WireImage/Getty)
10 years after blackout, US grid faces new threats
Stranded travelers try to keep cool in Grand Central Terminal in New York City, Friday, Aug. 15, 2003, as most of the city woke up without electricity for a second day. (Photo by Paul Hawthorne/WireImage/Getty)
Traffic Controll Officer Alleyne directs traffic in the intersection of 14th street and Broadway as pedestrians pack the street in Greenwich Village, New York City, Aug. 14, 2003. (Photo by Paul Hawthorne/WireImage/Getty)
10 years after blackout, US grid faces new threats
Traffic Controll Officer Alleyne directs traffic in the intersection of 14th street and Broadway as pedestrians pack the street in Greenwich Village, New York City, Aug. 14, 2003. (Photo by Paul Hawthorne/WireImage/Getty)
Pedestrians pack the street as they stream down Broadway in Greenwich Village, New York City, Aug. 14, 2003. (Photo by Paul Hawthorne/WireImage/Getty)
10 years after blackout, US grid faces new threats
Pedestrians pack the street as they stream down Broadway in Greenwich Village, New York City, Aug. 14, 2003. (Photo by Paul Hawthorne/WireImage/Getty)
A Con Edison crew works on restoring power in Manhattan, Friday, August 15, 2003 after a massive power blackout in the Northeastern US. (AP Photo/J. David Ake)
10 years after blackout, US grid faces new threats
A Con Edison crew works on restoring power in Manhattan, Friday, August 15, 2003 after a massive power blackout in the Northeastern US. (AP Photo/J. David Ake)
$Peachy Garcis soaps up near a fire hydrant on Ninth Ave. and 25th St. the day after a massive power failure caused the largest power outage in the nation's history, affecting 50 million people in parts of seven states and Canada. (Photo by Corey Sipkin/NY Daily News Archive via Getty Images)
10 years after blackout, US grid faces new threats
$Peachy Garcis soaps up near a fire hydrant on Ninth Ave. and 25th St. the day after a massive power failure caused the largest power outage in the nation's history, affecting 50 million people in parts of seven states and Canada. (Photo by Corey Sipkin/NY Daily News Archive via Getty Images)

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