Beltway in the dark: More than 300 streetlights out along the busy highway

In early April, a WTOP staffer noticed an unusual number of streetlights were out along the Beltway in Maryland, with more than 60 spotted between Interstate 95 and the exit to Connecticut Avenue. This left large sections of the interstate where streetlights exist, in the dark. Was it just one section of highway being plagued by the outages?