BP and ConocoPhillips, the two oil giants behind the ­Alaska project, submitted a plan to the energy regulator outlining the commercial and technical terms, projected costs and targeted throughput rates for the ­estimated $35 billion project.

Only days before it filed its plan, Denali’s biggest competitor, the proposed Alaska Pipeline project spearheaded by Canadian pipeline operator TransCanada with US supermajor ExxonMobil, was given conditional approval by the Ferc to begin its own open ­season later this month.

“Since