PIERCE COUNTY, Wash. (KOMO) — Two men from Puyallup, Washington were arrested Saturday in connection to attacks on four Pierce County power substations during the Christmas holiday.

Matthew Greenwood, 32, and Jeremy Crahan, 40 were expected to appear in court Tuesday on charges of conspiracy to damage energy facilities and possession of an unregistered firearm. If convicted, the men could face up to 30 years in prison.

Prosecutors are asking they remain at the Federal Detention Center at SeaTac, pending future hearings.

The attacks cut power to thousands, caused at least $3 million in damage, and will take 36 months to repair.

According to court documents, the two men broke into the four substations and manipulated the high side breaks, causing the outages but did not steal or cut any wire. They reportedly told law enforcement they cut the power so they could rob a nearby business.

The U.S. Department of Justice said the men were identified through cell phone records, with law enforcement officials arresting them a few days after the attack. Video at one of the substations also captured images of one of the men and a pick-up truck.

I am so thankful for how quickly and diligently our investigators and partners worked to bring this to a resolution,” said Richard A. Collodi, Special Agent in Charge of the FBI's Seattle field office. “This case took many of them away from their families during the holidays but through their efforts, we have two men in custody we believe to be responsible for all four power station attacks.”

The FBI served a search warrant during the weekend and found clothing matching the clothing seen on the surveillance video in the men's homes. Agents also seized two unregistered short-barreled guns, including one with a makeshift silencer.

Two substations in Graham and Elk Plains are operated by Tacoma Power, and the substations in Kapowsin and Hemlock are operated by Puget Sound Energy.

Conspiracy to attack energy facilities is punishable by up to 20 years in prison, while possession of an unregistered firearm is punishable by up to 10 years in prison, according to the Department of Justice.

The Federal Bureau of Investigation is investigating the case with assistance from the Pierce County Sheriff’s Department, the Bureau of Alcohol, Tobacco, Firearms & Explosives, the Tacoma Police Department, the Washington State Department of Corrections, and the Federal Protective Service.

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