WATCH: New York substation fire lights up the night sky

A transformer explosion at an electrical plant set the skies above New York City ablaze in an eerie, pulsing blue light on Thursday night, causing scattered power outages, delaying flights and sparking a social media storm of jokes about an alien invasion.

The blast prompted a brief fire at a sprawling Con Edison facility in Queens – but no injuries – and a spectacular illumination of the New York skyline that generated a flurry of online commentary.

The explosion impacted subway service in the area and caused a brief ground stop at LaGuardia Airport, which experienced power outages.

Gov. Andrew Cuomo described a "major electrical failure" at the electrical substation along the East River, near the Rikers Island prison complex and across a small bay from LaGuardia.

Power had been largely restored to LaGuardia by 23:00 and the airport was resuming normal operations. Travellers were still asked to check with their carriers for updated flight information.

The lights caused a stir on social media as several witnesses posted photographs and videos of a bright, blue flash that filled the night's sky. The Manhattan skyline and iconic East River bridges were suddenly silhouetted against a backdrop of pulsating light.

People flocked to social media to find out what happened and to share their views of the plumes of smoke pouring from the transformer.

"It was pitch black outside and then suddenly the whole side of the eastern sky was lighting up and changing colours," said Madeleine Frank Reeves, who saw the lights from her Upper West Side apartment. "It lasted a couple of minutes."

No alien invasion

Some observers wondered whether aliens were invading and joked that the trend of gender reveal parties had finally gone too far. Television host Keith Olbermann referred to the episode as the "Blue Light Special".

"Something insane is happening in the sky above Manhattan right now," New York University sociologist Eric Klineberg wrote on Twitter under a video of the flashing sky.

Mayor Bill de Blasio's spokesperson Eric Phillips tweeted that the lights were attributable to a "blown transformer".

"Not aliens," Phillips tweeted.

John Tebbett, who lives two blocks away from the facility, told NY1 the explosion was followed for about five minutes by a loud roar. The blast had caused the lights in his home to flicker off and on, he said. Tebbett, an instructor with the local electrical union, walked down toward the facility to get a better look.

"You could hear the roar and see the super white, bright light," Tebbett said. "It took them about five minutes, maybe. As we were watching it, it was like somebody turned off the power and it just went dark and then it was quiet. The roar stopped and it was dead quiet for a moment and then you could hear the emergency vehicles start to come in."

It was the second major incident involving Con Edison in the last six months. In July, a steam pipe explosion spewed asbestos-laden vapor into the air in Manhattan's Flatiron District, driving hundreds of people from their homes and businesses.

Con Edison said on Twitter on Thursday night that there was "a brief electrical fire at our substation in Astoria which involved some electrical transformers and caused a transmission dip in the area".

The utility said in a statement early on Friday that an electrical fault on the 138 000 volt equipment caused a sustained electrical arc flash but the "affected equipment was isolated to a single section within the substation".

Con Edison said it had restored all major transmission lines associated with the event and was in the process of investigating the cause of the failure.

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