Key Takeaways Enbridge okays a $1.4B Mainline Optimization Phase 1 to expand Mainline and Flanagan South capacity.The project adds 250,000 bbl/d through terminal upgrades, pump stations and system enhancements.Enbridge may consider a second expansion phase that could add up to 250,000 bbl/d more capacity.Enbridge Inc. (ENB) , a leading pipeline operator in North America, has approved a major expansion project, named the Mainline Optimization Phase 1 project, worth $1.4 billion to expand the capacity of the ...