The ESB has described a stunt where three skydivers flew between the Poolbeg chimneys in Dublin as a "serious safety incident".
Footage shows Red Bull's Marco Fürst, Marco Waltenspiel and Max Manow flying through the two chimneys this morning, reaching a top speed of 253km/h and completing their flight in just over a minute.
Wingsuit flying is an extreme sport involving a nylon suit with three wings and a parachute.
In a statement, the ESB said the Poolbeg chimneys, while no longer in use, are "part of an operational site with regular maintenance and works being carried out".
The company has said they were not approached in relation to the skydive and did not give permission for it to take place.
The statement added that work is currently under way at the chimneys, with steeplejacks currently working on one of the towers.
"There was potential for a very serious safety incident for the skydivers involved, as well as the workers on the chimney," ESB has said.
"ESB take this incident very seriously and have raised this safety incident with the Irish Aviation Authority and the Health and Safety Authority."
In response to the ESB statement, Red Bull said: "Three members of the Red Bull Sky Dive Team completed a flight over Dublin Bay at sunrise this (Friday) morning.
"This was done with rigorous safety measures and with the permission from all the required relevant authorities – i.e. the Irish Aviation Authority and Air Traffic Control."
The IAA has been approached for comment in relation to the ESB statement.
Earlier, Red Bull said the skydivers were brought to a height of 1,280 metres above Dublin Bay via helicopter this morning.
They then began their descent over the Great South Wall and towards the Poolbeg chimneys, which they passed through at 135 metres above the ground.
The team had to perform a 'flare' manoeuvre in order to regain the height needed to pull their parachutes and land safely on Shelly Banks Beach.
