NAHANT – Firefighters said an electrical fire was extinguished before it could cause further damage to the inside of a Willow Road home Saturday evening.”It was in the beginning stages; it was a good stop,” Nahant Firefighter Robert Barreda said Sunday.Firefighters responded to 166 Willow Road at 9:50 p.m. Saturday on the report of a fire. A second alarm was rung shortly thereafter, with Swampscott Fire Department responding to the scene to augment the two engines and a single ladder truck from Nahant, Barreda reported. Lynn Fire Department covered the Nahant station while the local department was on scene.Barreda said the fire was in the walls of a second-floor room of the home, and the flames extended into the home’s attic story. He estimated the damage costing up to $50,000 and said the damage was contained to the inside of the home.The scene was cleared and the Nahant crew was back manning its station by midnight, Barreda reported.