Enbridge (ENB) and its Enbridge Pipelines unit are seeking approval from holders of Enbridge Pipelines' outstanding medium term note for an equal principal amount of newly issued Enbridge notes with the same terms, the companies said Monday.

The debt exchange offer covers 14 series of notes maturing between 2027 and 2053, the company said.

Noteholders who validly provide written consent by the applicable deadline will receive amendment review fees ranging from $1.50 to $5 per $1,000 principal amount, if the proposal is approved, the company said.