Regulatory delays, COVID-19, winter and additional environmental measures add up, mostly on the Minnesota segment. 10:24 am, Feb. 19, 2021 × Enbridge's Line 3 oil pipeline under construction near the intersection of Hohensee and West Moorhead roads in Carlton County in January. (Clint Austin / 2021 file / caustin@duluthnews.com) DULUTH — The cost to build Enbridge's Line 3 oil pipeline, currently under construction across northern Minnesota, has increased by $1.1 billion, the company told investors Friday, Feb. 12. In a call announcing 2020 financial results, Enbridge President and CEO Al Monaco said regulatory delays, winter construction, additional environmental measures and COVID-19 protocols forced costs to build the U.S. segment — 93% of which is in Minnesota — to jump from $2.9 billion to $4 billion.