Kremlin-connected cyber-criminals are capable of turning off our electric power from afar while power-plant employees watch helplessly.

In the last two weeks, the Department of Homeland Security held four briefings, including one in New York City on July 31, warning that Russian hackers are already practicing how to throw the switch and cause a blackout in the United States. We’d have no lights, no gas at the pump, no life support in hospitals, no mass transit, no food supply.

Yet nearly all Washington pols are ignoring the danger. To the public, “power” means electricity. To self-absorbed politicians, “power” means elections, votes and protecting their seats.

That disconnect explains why they’re in a frenzy over Russians hacking into campaign email accounts instead of dealing with the far larger peril of Russians hacking into the electric grid.

Russians have invaded more than 100 American electric-power companies in the past four years. DHS reports these Russians “got to the point where they could have thrown switches” and shut off power, but didn’t.

In Ukraine, they did. They flipped the switches on three Ukrainian utilities on Dec. 23, 2015. Local engineers in control rooms sat stunned as cyber-criminals operated controls remotely, plunging hundreds of thousands of people into frigid darkness. That was the first long-distance cyber-attack to take down a power grid.

Secretary of Homeland Security Kirstjen Nielsen says the threat against American power grids is equivalent to a “Cat 5 hurricane.”

Fortunately, Ms. Nielsen explains, Russian hackers are still in the reconnaissance phase. They took nine months to collect information before their Ukrainian attack.

Here, they’re setting up internet sites to lure vendors who service the utility companies. They steal vendors’ passwords and other codes to infiltrate control rooms and gather information on how the utility is digitally controlled.

The United States is harder to cripple than Ukraine. America has not one but three power grids fed by 8,000 generating plants and several thousand distribution utilities. Con Edison uses different software from Pacific Gas Electric. That decentralization means even a successful attack would likely affect only a region, not the entire nation.

Even so, the impact could cost billions of dollars in lost economic production, and even worse, many lives. To prepare for an attack, Homeland Security will be conducting in November on New York’s Plum Island a weeklong drill on how to save lives during a blackout and the step-by-step methods to restore electricity.

To avert future attacks, Ms. Nielsen announced a National Risk Management Center linking federal agencies — including the FBI, Homeland Security, Energy and Defense — with the hundreds of electric companies that are targets. These are private companies without the means to defend themselves from cyber warfare any more than Walmart or Bloomingdale’s could defend itself from a missile attack.

Protecting the electric supply is government’s job. Sadly, most members of Congress are all-consumed with protecting their own line of work instead — getting re-elected. They’re focused on the fact Russians were behind the release of emails and campaign memos unflattering to the Clinton campaign, and some of the inflammatory political rhetoric on Facebook and Twitter during the 2016 election.

There is no evidence these Russians cast illegal votes, or tampered with voting machines on Election Day. Yet Washington pols are hysterical over what they inaccurately term Russian “election meddling.” In truth, it’s largely public-opinion meddling. Pernicious, though hardly as serious as targeting the electric grid.

Yet last week Congress ignored Homeland Security’s alarming revelations. Senators Lindsey Graham, John McCain, Jeanne Shaheen and a large bipartisan group unveiled the Defending American Security from Kremlin Aggression Act, which calls for “crushing sanctions” against Russia for interfering in our elections. Not a word from these pols about protecting our electric power supply.

Ask yourself what’s more important, averting a deadly power blackout or protecting pols from nasty comments on Twitter?

Ms. McCaughey is a senior fellow at the London Center for Policy Research.