For 28 years, Yorktown’s coal units helped keep the Peninsula’s lights on. Now they’re powering down.

They cut Yorktown Unit 2 off from Virginia’s electric grid for the last time Wednesday night, a day and a half after Dominion Energy Virginia fired up its new 500,000-volt transmission line, but the giant turbine would spin very slowly for four more days, to cool off.

The 28-year-old workhorse coal power unit had, along with Yorktown 1, idled a few days earlier, kept the Peninsula from any risk of rolling blackouts 100 times over the past two years, on days when thermometers soared or plunged or when Dominion crews had to take major power lines or equipment down.

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