An alleged white-supremacist terrorist was arrested just moments before he tried to blow up a Nashville energy facility with an explosive-packed drone as part of a terrifying plot to “sow violence and chaos,” according to the Justice Department.

Skyler Philippi, 24, who had allegedly been plotting the attack for months with undercover FBI agents, had even donned a skull mask and brazenly posed for selfies with the “weapon of mass destruction” just hours before he was nabbed, according to the feds.

“As charged, Skyler Philippi believed he was moments away from launching an attack on a Nashville energy facility to further his violent white supremacist ideology – but the FBI had already compromised his plot,” Attorney General Merrick Garland said Monday.

Philippi, who is allegedly affiliated with a slew of white nationalist groups, initially raised his substation plot in July with someone who, unbeknownst to him, was actually an FBI source, court papers allege. 

“Philippi researched previous attacks on electric substations and concluded that attacking with firearms would not be sufficient,” the filing said. “Philippi, therefore, planned to use a drone with explosives attached to it and to fly the drone into the substation.”

After detailing his alleged plot to others, Philippi and several undercover FBI agents then went to one of his apparent substation targets to conduct reconnaissance in September, according to the complaint.  

En route to the reconnaissance mission, Philippi ordered C-4 and other explosives from the undercover operatives – and later purchased black powder to be used in pipe bombs, the feds allege.

During the alleged planning stages, Philippi texted one of the operatives, saying “Holy sh-t. This will go up like a fu–in’ fourth of July firework,” according to court papers.

He also talked about the need for disguises, the use of leather gloves, wearing shoes that are too big and how they would have to burn their clothes after the attack, the filing states.  

He also allegedly told his crew to leave their smartphones behind on the night of the attack.

Then, on Saturday, Philippi carried out a Nordic ritual inside a Nashville hotel before saying it was “time to do something big” that would be remembered “in the annals of history,” according to court docs.

Prior to leaving the hotel room, Philippi and at least two operatives allegedly donned terrifying masks and took a picture holding up the explosives.  

Philippi allegedly then armed himself with the drone, which he believed had 3 pounds of C-4 attached to it, and drove with the operatives to the target site.

He was cuffed by agents soon after he arrived and powered up the drone, the feds said.

During the planning stages, Philippi had allegedly boasted to undercover officials that he was affiliated with several white nationalist and extremist groups — including the National Alliance, which calls for eradicating the Jewish people and other races.

Some extremist groups, of late, have viewed attacking the US’ power grid – which includes more than 6,400 power plants — as a means of disrupting the country.

At one point, Philippi had allegedly shown an undercover agent experts of his so-called manifesto, which focused heavily on preserving the white race.

“This case serves as yet another warning to those seeking to sow violence and chaos in the name of hatred by attacking our country’s critical infrastructure: the Justice Department will find you, we will disrupt your plot, and we will hold you accountable,” the attorney general said in the wake of his arrest.

Philippi is charged with attempted use of a weapon of mass destruction and attempted destruction of an energy facility.

If convicted, he faces a maximum penalty of life in prison.