An undersea oil pipeline that for more than 50 years supplied Carlsbad’s Encina power plant with fuel and helped keep the lights on across San Diego County soon will be history.

NRG/Cabrillo Power has applied to the California Coastal Commission for permission to remove the 20-inch-diameter steel-and-concrete pipeline that extends out from beneath the power plant on Carlsbad Boulevard more than half a mile into the ocean at a depth of roughly 60 feet.